Nova Patents
IL157984A

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2 claims: 2 independent, 0 dependent

  1. 1
    SYSTEMS AND METHODS OF TRANSMITTING AND ENCRYPTING INFORMATION π·η π39ϊπι miyn1? rncwi nmyn - 1 - SYSTEMS AND METHODS OF TRANSMITTING AND ENCRYPTING INFORMATION TECHNICAL FIELD [001] In general, the present invention pertains to information technologies and the art of cryptography. In particular, the invention relates to systems and methods of transmitting information as well as to methods of encrypting the same. BACKGROUND ART [002] It is believed that the current state of the art is represented by:US patent application Ser. No. US 2009/150561;UK patent application Ser. No. GB 2430124;European patent application Ser. No. EP 2439585;as well as international patent applications Ser. No. WO 2012/018246 and WO 2008/097323. [003] WO 2012/018246 discloses a six quantum state producing encoder system for deterministic six states protocol of Quantum Key Distribution. The system of WO 2012/018246 includes at least three laser diodes, at least three current drivers, wherein each of the at least three laser diodes are at different polarization states and each laser diode is drivable by each current driver, at least three switches connectable to the at least three current drivers, at least one pulse width modulator (PWM) generator connectable to the at least three switches and a controller wherein the at least three switches are triggerable by the controller. The system of WO 2012/018246 is configurable to select a pair of different laser diodes with new polarization states for every two consecutive period, wherein two different laser diodes are interchangeably triggered for every two consecutive periods for automatic production of six quantum states. [004] US 2009/150561 discloses methods for establishing modulator timing for a QKD system having QKD stations with respective modulators. The timing method includes exchanging non-quantum signals between the two QKD stations and performing respective coarse timing adjustments by scanning the modulator timing domain with relatively coarse timing intervals and wide modulator voltage signals. Coarse timings are established by observing a change in detector counts between single-photon detectors when modulation occurs in exchanged nonquantum signals. The method also includes performing a fine timing adjustment by scanning the modulator timing domain with respective fine timing intervals and respective relatively narrow modulator voltage signals and again observing a change in detector counts for exchanged nonquantum signals. This - 2 - operation is repeated until desired final modulator timings and desired final activation signal widths are obtained for the two modulators. [005] WO 2008/097323 discloses an apparatus that converts information encoding on an electromagnetic wave includes a delay module and a time-dependent module. The delay module is configured to apply a first time delay to a first component of an electromagnetic wave and to apply a second time delay different from the first time delay to a second component of the electromagnetic wave. The time-dependent module is configured to respond to a control signal to apply a first transformation to the first component at a first time and to apply a second transformation to the second component at a second time that is later than the first time by the difference between the first time delay and the second time delay. [006] GB 2430124 discloses a quantum communication system comprising a sending unit and a receiving unit, said sending unit comprising a photon source assembly configured to output a stream of pulses of light having at least two different intensities and a memory configured to store information for determining which pulses should be reference pulses and which pulses should be data pulses, the average intensity of reference pulses being different to the average intensity of data pulses, the receiving unit comprising a memory for storing information for identifying the position of reference pulses within the stream of pulses and a processor for determining the calibration of the quantum communication system from the reference pulses. Preferably the number of data pulses per unit time differs from the number of reference pulses per unit time. The reference pulses may have at least two different intensity levels. [007] EP 2439585 discloses a wavelength-multiplexed polarization entangled photon pair generator including: a pump light source, a polarization entangled photon pair generating body on which pump light outputted from the pump light source falls and a spectrometer on which a wavelength-multiplexed parametric photon pair outputted from the polarization entangled photon pair generating body falls. The polarization entangled photon pair generating body made of a nonlinear optical crystal generates wavelength-multiplexed photon pairs by subjecting the pump light to type II phase matching. As a nonlinear optical crystal, lithium tantalate of periodically poled structure can be used, and as a spectrometer, an arrayed-waveguide grating can be used. Wavelength-multiplexed polarization entangled photon pairs can thus be generated with simple equipment. - 3 - DESCRIPTION OF THE DRAWINGS [008] The present invention will be understood and appreciated more comprehensively from the following detailed description taken in conjunction with the appended drawings in which: FIG 1 is a schematic graphical representation of an embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 2 is a schematic graphical representation of another embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 3 is a schematic graphical representation of yet another embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 4 is a schematic graphical representation of still another embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 5 is a schematic graphical representation of the signal shown in FIG 3, where X-axis is time and Y-axis is the frequency of the signal;FIG 6 is a schematic graphical representation of the signal shown in FIG 4, where X-axis is time and Y-axis is the frequency of the signal;FIG 7 is a schematic graphical representation of yet still another embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 8 is a schematic graphical representation of still yet another embodiment of the signal, where X-axis is time and Y-axis is the amplitude of the signal;FIG 9A is a schematic graphical representation of another embodiment of the signal, where X-axis is time and Y-axis is the spin of the signal;FIG 9B is a schematic graphical representation of yet another embodiment of the signal, where X-axis is time and Y-axis is the spin of the signal;FIG 10 is a schematic block diagram of an embodiment of the system for transmitting and optionally encrypting information;FIG 11 is a high-level flowchart of an embodiment of the method for transmitting and optionally encrypting information. [009] While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown merely by way of example in the drawings. The drawings are not necessarily complete, emphasis instead being placed upon clearly illustrating the principles underlying the present invention. - 4 - DETAILED DISCLOSURE OF EMBODIMENTS [010] Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with technology- or business-related constraints, which may vary from one implementation to another. Moreover, it will be appreciated that the effort of such a development might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure. [011] In accordance with some embodiments of the present invention, reference is now made to FIG 1 to 11. Exemplary system 100 for transmitting and optionally encrypting information is shown in FIG 10. System 100 comprises sender moiety 112 and recipient moiety 114, connected in-between via a computer network, such as internet network 116, and/or via some other communication means, such as quantum link 118, which is optionally an optic fiber. Sender moiety 112 comprises first input module 115, signal generator 120, first dedicated chronometer 126 and transmitter 128 as well as optionally signal alternator 124, second input module 125 and signal modulator module 125. [012] Signal generator 120 is operable in generating a signal. The signal generated by generator 120 is in a non-limiting manner includes: an electromagnetic wave, an electric current and mechanical wave. In some embodiments, the signal generated by generator 120 is optionally continuous or constant. In such a case signal alternator 124 is optionally employed to alter at least one parameter of the continuous or constant signal, generated by generator 120. The aforementioned at least one parameter altered in the signal is a non-limiting manner selected from the group consisting of: [i] an amplitude, [ii] spectrum, [iii] frequency and [iv] polarization. [013] In other embodiments, the signal generated by generator 120 optionally is alternated, segmental or intermittent. In such a case the parameter of the alternated, segmental or intermittent signal generated by generator 120 is a non-limiting manner at least of the aforementioned parameters. The alternated signal, whether directly generated by generator 120 or subsequently alternated signal alternator 124, optionally embodies a variety of forms or characteristics, inter alia represented by at least of the aforementioned parameters, schematic representation of which is shown throughout FIG 1 to 9B, as will be elaborated infra. [014] First dedicated chronometer 126 in sender moiety 112 is capable of - 5 - measuring time with the precision of a predefined time unit. It is noted that the predefined time unit, with the precision of which first dedicated chronometer 126 is capable of measuring time, which is optionally not constant but rather a predeterminably changed during and/or between sessions of transmittance of the signal by transmitter 128, as will be elaborated infra. The current state of the art provides for techniques of measuring time Q with the precision of up to 10-8 second. The exemplary time unit of the X-axis, in the schematic representations of the alternated signal shown throughout FIG 1 to 9B, is set for exemplary value 10-6 second or 1 microsecond or 1 μ Sec. [015] First dedicated chronometer 126 is capable of influencing signal generator 120 and/or signal alternator 124, so as to alternate the signal transmitted by transmitter 128, upon a predefined number of time units. A controller (not shown), typically comprising drivers, is optionally employed to effect the alternation of the signal upon a predefined number of time units counted by first dedicated chronometer 126. [016] In accordance with some embodiments of the method for transmitting and optionally encrypting information, the high-level flowchart 150 of which shown in FIG 11, initially a signal is generated, at step 152, by signal generator 120 in sender moiety 112 of system 100. Thereafter, at step 154, a first alternation of the signal is enacted, typically either by signal generator 120 or by signal alternator 124. The first alternation of the signal is enacted after a predefined number of time units, counted by first dedicated chronometer 126, wherein the aforesaid predefined number of time units corresponds to a respective predefined number, from the first information set, inputted to sender moiety 112 of system 100 via first input module 115. The first alternation of the signal is a non-limiting manner of at least one type selected from the group consisting of: [i] commencing generating the signal, [ii] halting generating the signal and [iii] changing at least one parameter of the signal, which is typically at least one of the aforementioned parameters. [017] Subsequently, at step 156, a second alternation of the signal is enacted, typically either by signal generator 120 or by signal alternator 124. The second alternation of the signal is also enacted after a predefined number of time units, counted by first dedicated chronometer 126, wherein the aforesaid predefined number of time units corresponds to a respective predefined number, from the first information set, inputted to sender moiety 112 of system 100 via first input module 115. As previously mentioned, the alternations of the signal, whether first second or subsequent, are optionally of different above-define types. Thus an alternation of the signal is a change in amplitude, frequency, spin or other parameter of the signal, as a function of time, represented in FIG 1 to 9B. [018] Graphical representation 10 of exemplary alternated signal 15 is shown in - 6 - FIG 1. The amplitude of alternated signal 15, graphical representation 10 of which is shown in FIG 1, changes between the magnitude of one unit and the magnitude of two units, shown along Y-axis 14, during the time, shown along X-axis 12. The units of time along X-axis 12 are microseconds;whereas units of amplitude along Y-axis 14 are arbitrary units of magnitude, optionally of a logarithmic scale. [019] Alternated signal 15 commences at zero time point, with amplitude of two units, and continues for 47 microseconds. After 47 microseconds signal 15 is subjected to first alternation, while the amplitude of signal 15 is changed to the magnitude of one unit, at step 154. 19 microseconds thereafter signal 15 is subjected to subsequent alternation, while the amplitude of signal 15 is changed once again to the magnitude of two units, at step 156. Following 11 microseconds signal 15 is subjected to subsequent alternation, while the amplitude of signal 15 is once again changed to the magnitude of one unit, while step 156 is performed iteratively. [020] Graphical representation 20 of exemplary intermittent signal 25 is shown in FIG 2. The amplitude of intermittent signal 25, graphical representation 20 of which is shown in FIG 2, changes between the magnitude of one unit and the magnitude of zero units or absence of the signal, shown along Y-axis 24, during the time, shown along X-axis
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    12. The units of time along X-axis 12 are microseconds; whereas units of amplitude along Y-axis 24 are arbitrary units of magnitude, optionally of a logarithmic scale. [021] Intermittent signal 25 commences at zero time point, with amplitude of one unit, and continues for 47 microseconds. After 47 microseconds intermittent signal 25 is subjected to first alternation, while signal 25 is halted and the amplitude of changed to the magnitude of zero, at step 154. 19 microseconds thereafter intermittent signal 25 commences again and thus is subject to subsequent alternation, while the amplitude of signal 25 is changed once again to the magnitude of one unit, at step 156. Following 11 microseconds signal 25 is subjected to yet subsequent alternation, while the amplitude of signal 25 is once again resumed to the magnitude of one unit, as step 156 is performed iteratively. [022] As shown in graphical representations 10 and 20 of FIG 1 and 2, alternated and intermittent signals 15 and 25 embody a carrier signal or carrier wave that is modulated, preferably by signal modulator 130, with an additional input signal, which corresponds to additional information, from additional information set, which is optionally inputted to sender moiety 112 of system 100 via second input module 125, during step 157. It is noted that the modulation of alternated and intermittent signals 15 and 25, by signal modulator 130, performed irrespectively to the alternation thereof and hence - 7 - optionally encoding additional information, from additional information set, into alternated and intermittent signals 15 and 25 is achieved. Moreover it should noted that optionally there is no encoding of additional information by modulation of alternated and intermittent signals 15 and 25, whereas the signal is rather flat or plain; therefore the term modulation is also used for an unmodulated emission in the absence of any modulating signal, in accordance with Federal Standard 1037C, titled Telecommunications:Glossary of Telecommunication Terms, is a United States Federal Standard issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as well as in accordance with MIL-STD-188 series of U.S. military standards. [023] It is further emphasized that various types of modulations are operationally applied to alternated and intermittent carrier signals 15 and 25;thus the modulation optionally applied alternated and intermittent signals 15 and 25 is a non-limiting manner selected from: frequency modulation (FM), amplitude modulation (AM), pulse-frequency modulation (PFM), digital baseband modulation (line coding), pulse-amplitude modulation (PAM), pulse-width modulation (PWM), pulse-depth modulation (PDM), pulse-position modulation (PPM), pulse-code modulation (PCM), differential PCM (DPCM), adaptive DPCM (ADPCM), delta modulation (DM or Δ-modulation), delta-sigma modulation (ΣΔ), continuously variable slope delta modulation (CVSDM), and particularly any type of digital modulation techniques: phase-shift keying (PSK), binary PSK (BPSK), quadrature PSK (QPSK), 8PSK, 16PSK, differential PSK (DPSK), differential QPSK (DQPSK), offset QPSK (OQPSK), frequency-shift keying (FSK), audio frequency-shift keying (AFSK), multifrequency shift keying (M-ary FSK or MFSK), dual-tone multi-frequency (DTMF), amplitude-shift keying (ASK), on-off keying (OOK), M-ary vestigial sideband modulation, for example 8VSB, quadrature amplitude modulation (QAM), polar modulation, continuous phase modulation (CPM), minimum-shift keying (MSK), Gaussian minimum-shift keying (GMSK), continuous-phase frequency-shift keying (CPFSK), orthogonal frequency-division multiplexing (OFDM) modulation, discrete multitone (DMT), wavelet modulation, trellis coded modulation (TCM), also known as trellis modulation, spread-spectrum techniques, direct-sequence spread spectrum (DSSS), chirp spread spectrum (CSS), frequencyhopping spread spectrum (FHSS). [024] Graphical representation 30 of exemplary alternated signal 35 is shown in FIG 3. The amplitude of alternated signal 35, graphical representation 30 of which is shown in FIG 3, remains relatively constant, however the frequency of alternated signal 35 changes between the magnitude of one unit and the magnitude of two units, shown along Y-axis 24, during the time, shown along X-axis 12. The units of time along X-axis 12 are - 8 - microseconds;whereas units of amplitude along Y-axis 24 are arbitrary units of magnitude, optionally of a logarithmic scale. Exemplary alternated signal 35, graphical representation 30 of which is shown in FIG 3, expressed as the function frequency, corresponds to the form of frequency alternated signal 55, graphical representation 50 of which is shown in FIG 5. In graphical representation 50 shown in FIG 5, Y-axis 54 represents frequency in arbitrary units of magnitude, optionally of a logarithmic scale, whereas the time is shown along X-axis 12. [025] Alternated signal 35 commences at zero time point, with frequency of one unit, and continues for 47 microseconds. After 47 microseconds signal 35 is subjected to first alternation, while the frequency of signal 35 is changed to the magnitude of two units, at step 154. 19 microseconds thereafter signal 35 is subjected to subsequent alternation, while the frequency of signal 35 is changed once again to the magnitude of one unit, at step 156. Following 11 microseconds signal 35 is subjected to subsequent alternation, while the frequency of signal 35 is once again changed to the magnitude of one unit, while step 156 is performed iteratively. [026] Graphical representation 40 of exemplary intermittent signal 45 is shown in FIG 4. The frequency of intermittent signal 45, graphical representation 40 of which is shown in FIG 4, changes between the magnitude of one unit and the magnitude of zero units or absence of the signal, shown along Y-axis 24, during the time, shown along X-axis 12. The units of time along X-axis 12 are microseconds;whereas units of amplitude along Y-axis 24 are arbitrary units of magnitude, optionally of a logarithmic scale. Exemplary alternated signal 45, graphical representation 40 of which is shown in FIG 4, expressed as the function frequency, corresponds to the form of frequency alternated signal 65, graphical representation 60 of which is shown in FIG 6. In graphical representation 60 shown in FIG 6, Y-axis 64 represents frequency in arbitrary units of magnitude, optionally of a logarithmic scale, whereas the time is shown along X-axis 12. [027] Intermittent signal 45 commences at zero time point, with frequency of one unit, and continues for 47 microseconds. After 47 microseconds signal 45 is subjected to first alternation, while signal 45 is halted and the frequency thereof is changed to the magnitude of zero, at step 154. 19 microseconds thereafter signal 45 commences again and thus is subject to subsequent alternation, while the amplitude of signal 45 is changed once again to the magnitude of one unit, at step 156. Following 11 microseconds signal 45 is subjected to yet subsequent alternation, while the amplitude of signal 45 is once again resumed to the magnitude of one unit, as step 156 is performed iteratively. [028] Graphical representation 70 of exemplary alternated pulse width modulated - 9 - (PWM) signal 75 is shown in FIG 7. The amplitude of alternated PWM signal 75, graphical representation 70 of which is shown in FIG 7, changes between the magnitude of one unit and the magnitude of two units, shown along Y-axis 14, during the time, shown along X-axis 12. Alternated PWM signal 75 commences at zero time point, with amplitude of two units, and continues for 47 microseconds. After 47 microseconds PWM signal 75 is subjected to first alternation, while the amplitude of PWM signal 75 is changed to the magnitude of one unit, at step 154. 19 microseconds thereafter PWM signal 75 is subjected to subsequent alternation, while the amplitude of PWM signal 75 is changed once again to the magnitude of two units, at step 156. Following 11 microseconds signal 75 is subjected to subsequent alternation, while the amplitude of signal PWM 75 is once again changed to the magnitude of one unit, while step 156 is performed iteratively. [029] Graphical representation 80 of exemplary intermittent PWM signal 85 is shown in FIG 8. The amplitude of intermittent PWM signal 85, graphical representation 80 of which is shown in FIG 8, changes between the magnitude of one unit and the magnitude of zero units or absence of the signal, shown along Y-axis 24, during the time, shown along X-axis 12. Intermittent PWM signal 85 commences at zero time point, with amplitude of one unit, and continues for 47 microseconds. After 47 microseconds PWM signal 85 is subjected to first alternation, while signal 85 is halted and the amplitude of changed to the magnitude of zero, at step 154. 19 microseconds thereafter PWM signal 85 commences again and thus is subject to subsequent alternation, while the amplitude of PWM signal 85 is changed once again to the magnitude of one unit, at step 156. Following 11 microseconds PWM signal 85 is subjected to yet subsequent alternation, while the amplitude of PWM signal 85 is once again resumed to the magnitude of one unit, as step 156 is performed iteratively. [030] As shown in graphical representations 70 and 80 of FIG 7 and 8, alternated and intermittent signals 75 and 85 embody a carrier signal that is modulated according to PWM, preferably by signal PWM modulator 130, encoding additional information, from additional information set, during step 157, which is optionally inputted to sender moiety 112 of system 100 via second input module 125. It is noted that the modulation of alternated and intermittent signals 75 and 85, by signal PWM modulator 130, performed irrespectively to the alternation thereof and merely optionally. [031] Graphical representation 90 of exemplary spin or phase alternated signal 95 is shown in FIG 9A. The spin or phase of alternated signal 95, graphical representation 90 of which is shown in FIG 9A, changes between the spin or phase of +1 and spin or phase of -1, shown along Y-axis 94, during the time, shown along X-axis 12. Spin or phase - 10 - alternated signal 95 commences at zero time point, with spin or phase of +1, and continues for 47 microseconds. After 47 microseconds spin or phase alternated signal 95 is subjected to first alternation, while the spin or phase of alternated signal 95 is changed to -1, at step 154. 19 microseconds thereafter spin or phase alternated signal 95 is subjected to subsequent alternation, while the spin or phase of alternated signal 95 is changed once again to +1, at step 156. Following 11 microseconds spin or phase alternated signal 95 is subjected to subsequent alternation, while the spin or phase of alternated signal 95 is once again changed to -1, while step 156 is performed iteratively. [032] Graphical representation 96 of exemplary spin or phase alternated and PWM signal 97 is shown in FIG 9B. The spin or phase of alternated and PWM signal 97, graphical representation 96 of which is shown in FIG 9B, changes between the spin or phase of +1 and spin or phase of -1, shown along Y-axis 94, during the time, shown along X-axis 12. Spin or phase alternated and PWM signal 97 commences at zero time point, with the spin or phase of +1 and continues for 47 microseconds. After 47 microseconds Spin or phase alternated and PWM signal 97 is subjected to first alternation, while the spin or phase of alternated and PWM signal 97 is changed to -1, at step 154. 19 microseconds thereafter spin or phase alternated and PWM signal 97 is subjected to subsequent alternation, while the spin or phase alternated and PWM signal 97 is changed once again to +1, at step 156. Following 11 microseconds spin or phase alternated and PWM signal 97 is subjected to subsequent alternation, while the spin or phase of alternated and PWM signal 97 is once again changed to -1, while step 156 is performed iteratively. [033] As shown in graphical representations 90 and 96 of FIG 9A and 95, spin or phase alternated signals 95 and 97 embody a carrier signal that is modulated, preferably by signal modulator 130, encoding additional information, from additional information set, during step 157, which is optionally inputted to sender moiety 112 of system 100 via second input module 125. It is noted that the modulation of spin or phase alternated signals 95 and 97, by signal modulator 130, performed irrespectively to the alternation thereof and merely optionally. [034] Thereafter alternated or intermittent signal, such as amplitude, frequency or spin alternated signals 15, 25, 35, 45, 55, 65, 75, 85, 95 or 97, respectively, shown in FIG 1 to 9B, optionally modulated by signal modulator 130 at step 157, is transmitted by transmitter 128, to recipient moiety 114 via a computer network, such as internet network 116, and/or via some other communication medium, such as quantum link 18, during step 158. [035] At step 160, the signal transmitted by transmitter 128 from sender moiety - 11 - 112 via internet network 116 and/or quantum link 18, during step 158, such as amplitude, frequency or spin alternated signals 15, 25, 35, 45, 55, 65, 75, 85, 95 or 97, respectively, shown in FIG 1 to 9B, is detected by detector 132 in recipient moiety 114 of system 100. Detector 132 in recipient moiety 114 of system 100 is capable of detecting the alternations of the signal transmitted by transmitter 128 from sender moiety 112 of system 100 via internet network 116 and/or quantum link 18, during step 158. Second dedicated chronometer 136 is capable of counting the number of time units between the alternations of the signal transmitted by transmitter 128, from sender moiety 112 of system 100, as detected by detector 132, during step 162. Optionally driver unit 134, receiving real time detection of alternations in the signal detected by detector 132 and the continuous count of the time units from second dedicated chronometer 136, is employed for counting the number of time units between the alternations of the signal transmitted by transmitter 128, from sender moiety 112 of system 100, as detected by detector 132, during step 162. [036] The number of time units counted between the alternations of the signal, as detected by detector 132, during step 162, whether by second dedicated chronometer 136, driver unit 134, detector 132 or some other means corresponds the predefined number which is determined during step 164 and typically delivered via first output module 138. Thus for instance detection of alternations in the signal detected by detector 132, such as the alterations in amplitude, frequency or spin of signals 15, 25, 35, 45, 55, 65, 75, 85, 95 or 97, respectively, shown in FIG 1 to 9B, during step 162, will result with determining the predefined numbers of 47, 19 and 11 during step 164. [037] Moreover if amplitude, frequency or spin alternated signals 15, 25, 35, 45, 55, 65, 75, 85, 95 or 97, respectively, shown in FIG 1 to 9B, embody a carrier signal or carrier wave that is modulated, as by signal modulator 130, with an additional input signal, from additional information set, the corresponding additional information, which is optionally encoded into amplitude, frequency or spin alternated signals 15, 25, 35, 45, 55, 65, 75, 85, 95 or 97, is optionally demodulated and the corresponding additional information, from additional information set, is interpreted by demodulator or modulation interpreter 140 during step 166 and typically delivered via second output module 142. [038] In accordance with some embodiments of the method for transmitting and encrypting information, it is assumed that the security of the computer network, such as internet network 116, as well as of some other communication medium, such as quantum link 18, between sender moiety 112 and recipient moiety 114, can be compromised and therefore an encryption of the predefined number, from the first information set, inputted to sender moiety 112 of system 100 via first input module 115, is implemented. - 12 - [039] Preferably the encryption of the information from the first information set, is achieved by predeterminably changing the aforesaid predefined time unit, during and/or between sessions of transmittance of the signal by transmitter 128. Thus the sender and the recipient may apply a protocol according to which the predefined time unit after a 5 certain number of alterations is changed. Therefore even if the security of the computer network or other communication medium between sender moiety 112 and recipient moiety 114 has indeed been compromised, the eavesdropping to the transmittance of the signal over the computer network or other communication medium, after a certain number of alterations, will be uninformative. 10 [040] Preferably the predefined time unit is predeterminably changed by multiplication thereof by a natural number, so that appearingly there is no change in the form of the signal transmitted over computer network or other communication medium between sender moiety 112 and recipient moiety 114. [041] Moreover, the system and method of the invention sustain a delay between 15 an alternation of the signal as transmitted from the first location and as detected in the second location. 20 REFERENCES [042] US patent application Ser. No. US 2009/150561 [043] UK patent application Ser. No. GB 2430124 [044] European patent application Ser. No. EP 2439585 [045] PCT applications Ser. No. WO 2012/018246 and WO 2008/097323 [046] Federal Standard 1037C, titled Telecommunications: Glossary of Telecommunication Terms, is a United States Federal Standard issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949 [047] MIL-STD-188 series of U.S. military standards [048] It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described herein above. Rather the scope of the invention is defined by the claims which follow: 25