Method for a secure information transfer

Translation of description of equivalent WO 02082768 A2

0001description

0002Method for secure transmission of information

0003The present invention relates to a method for a secure transmission of information between two terminal devices according to the preamble of patent claim 1.

0004Due to the increasing global orientation of companies, the use of telecommunications services is increasing

0005Transmission of language and data constantly. As a result, the costs incurred by these telecommunications services are constantly increasing and becoming a significant cost factor for businesses looking for ways to reduce those costs. One way to communicate data cost-effectively and globally is through local and global computer networks, such as an intranet or the Internet.

0006When accessing data or services - for example, to a server or to an application made available by the server - a first unit - for example, a company A - from a second unit - for example, a company B - or from a public - borrow connection - for example from ^λInternet '- it is important to be able to prevent unauthorized access to the data or services of the unit. This can be done by an authorization check preceding the access.

0007In an authorization check, it is necessary that in the first unit a claimant administration for the management of the access rights of each user is performed. Such a claimant administration has the disadvantage that the access rights for the external users must be communicated to the first unit (danger of misuse) and that a user independently logs in each time before accessing it. Furthermore, the beneficiary administration is continuously updated, which involves a high administrative effort.

0008For secure access on the basis of a second unit-for example, starting from a user device in an intranet of company B-it is also possible to provide access via a transmission device existing between the units. A transmission device in this sense, for example, a leased line - ie a specially configured physical line connection - or a logical connection - in the literature as Virutal Private Network, denoted VPN for short. Alternatively, in the second unit, a proxy device-also referred to in the literature as a proxy-can be defined, via which accesses to the first unit or to a server of the first unit are carried out.

0009However, these solutions have the disadvantage that access to the first unit must always be routed via the leased line, or that access must always be made via the proxy device.

0010The present invention has for its object to provide an alternative method by which a secure external access to data or services of a closed unit can be done.

0011The problem is solved on the basis of the features of the preamble of patent claim 1 by its characterizing features.

0012An essential advantage of the method according to the invention is that the method can be implemented with little effort in already existing systems. Another advantage of the method according to the invention is that no information about the individual authorized external users has to be stored in the first unit. Thus, the Adrαinistrationsaufwand in the unit can be greatly reduced.

0013Advantageous developments of the invention are specified in the subclaims.

0014One advantage of embodiments of the invention defined in the subclaims is, inter alia, that through the use of the HTTPS protocol (HTTPS: Hypertext Transport Protocol Secure) for a data transmission between the individual units involved in the method according to the invention and by an additional Encryption of the data to be transmitted - for example by means of the well-known PGP method (PGP: Pretty Good Privacy) - is prevented in a transmission over a public network unauthorized access to the transmitted data.

0015An embodiment of the invention will be explained in more detail below with reference to the drawing.

0016Showing:

00171 shows a block diagram for the schematic representation of the essential functional units involved in the method according to the invention; 2 shows a block diagram for the schematic representation of an exemplary message TAN1; and FIG. 3 shows a block diagram for the schematic representation of an exemplary confirmation message TAN2.

0018Fig. 1 shows schematically an intranet of a first entity Company-A and an intranet of a second entity Company-B. The two intranets are connected via the public Internet. Intranet is understood to mean a local computer network in which accesses to the (JO ω M K. P¹ P>

0019Ül o Cn o Cn o Cn

0020K P3 P_ P3 d 3 Cfl r + ω H ω σ Cfl < ^"d Cfl d ≥! ι-3 t__ Φ t_ P P-P-1 do P φ Φ φ e rt α öd <1 α ιQ H p, P- ω ιp CΛ J φ α φ d P φ P- p. P o P- ρ rt Φ 1 3 p- Φ

0021P_ __ ^ 3 __J h- 'o Hi N r +' Cfl PPP fl P d rt PH φ P- rr 3 Ω CΛ φ ω α d P rt j P> P> cn P- P^J P • li H i i rt ιQ φ d Hi Φ & P¹ rt N

0022CΛ NO ιQ φ? P P- <φ P-α_ Φ ≥ id ιq CΛ ^ Hi p, J rt α H "Φ P d

0023P- ^• 3 s:

00241 d: s: iQ ι-JP ö d rl φ H d 1 P^J d O 1 φ 1 P- P dd P rt d rt P- Φ j er Φ P- Φ P- r + P- Φ rl- H P- σ I-¹ ri- CΛ O iQ P Φ rt d rt! -> iQ H rt P

0025P Φ P d fl P- φ (ϊ- er cn d Φ N s; φ P d P rt P iQ φ §: rt Φ P?

0026O p. fl P er p- o αi P- 1 ds; φ P- H α H cn P d φ φ O d φ rr φ d P dg P. M d lO ιQ P- φ HP, d α 1 d 1 1 PP φ P- P

0027O p. P> P d Cfl φ φ P_P P- Φ Q. φ Φ P- N er Φ CΛ α 1 rt ddt T 0⁾ <d rt- Cfl _ P, d = d φ N d P- P, rt Φ φ Φ P- rt P- Φ Φ d Φ cn

0028O 05 Φ HI Φ • Φ α er d H- d Φ d P, ω P- P Cfl P, d P- Φ P- H iQ

0029P. tr P- Cfld φ φ vQ d 3 φ Cfl HP cn &lt;Q iQ φ rt α t &lt;l • d rt φ φ

0030H CΛ • P- Cfl d PP Cfl P, P- er ω P- φ rt Ω φ. φ rt H φ tr cn P CΛ φ φ φ P v v cn 3 ι O Hi o φ 1 d 3 t φ PP * i φ d φ

0031• rr 1 3 Cfl P. or - P- o φ d P- P- d- P- φ φ φ rt Cfl P- Cfl: P P- φ rt d

0032Φ N Cfl PH d Φ P P- H Φ d H r + • P- P- P- N 3 H dd P, n P-

0033N I-. N P- fl P- PJ [fd Cfl d er φ d P dd ιQ ds: CΛ φ P, Cfl * Ö dd P P- O cn φ α 2J P- P¹ dwddd H cn Φ rt O Φ 1 Φ Ω rt P,

0034P- Φ W Φ dd • P¹ MJ d cn dr iQ p. cn P- P rt P- o α P- ≥i tr φ φ O ω rr rt P_ rt P- d £ α φ ι Q φ o ιQ d 3 ≥! P s: rt H ddd Ω d

00353 P- Cfl iQ P- P- O dr dr 1 d P, Cfl d π d- φ dd φ φ P φ rt P- tr

0036Φ &lt;! Φ d: φ Hi P φ I T φ od &lt;id N P-rt rt P d P-dd N φ H φ φ s: P P- H P- Cfl P- Φ H o ι Q Φ Φ P Φ d 3 N t Φ Cfl Φ d P- d P-

0037P-HI φ &lt;! rt H i TP P- P ^ cn P 3 Φ er! d ιQ Φ Φ P- H iQ 3 NPP d

0038PO n Φ P- P &lt;! P 'rr Φ 3 p: p, rt CH PJ PP ιQ P- Φ Φ d α tr Φ φ rr H ι Q Φ rt Φ P rt fl o U n er P P- P- d Φ rt_^ ddt iQ QP Φ d H iQ • d P- P, ^ i φ α 1 P- d &lt;l Hi rt P- P- d- Ω. φ P φ rt P-

0039P_ cr CΛ P- rr o er rl- P- φ dd P- P Hi P- o Hi P d H) α φ φ d P- fl φ rt N d J ^

0040P- M 1 Cfl P- d P- φ P P- P- P P- φ φ d PP P- P P- d Hi dd Φ

0041P- CS3 rt H) d rt 3 d Φ P dd PPP P- N cn rt Hi P) ^ _ vQ rt

0042P d • P- CΛ P Φ r + S d φ d α φ d Φ Ω P- cn> <d he P- P. N

0043Φ φ φ W φ d 1 o P- iQ φ d φ Hi rt d "φ ^ ido P rt NP P s:

0044Φ Φ P- s P cn d P ts! - o ιQ P nd P rt H α P- Cfl dd P s: 3 Hi

0045P- ö d P- rr cn ιQ er φ P o φ φ P φ d rt φ P, HI HI PP Hi P.

0046P_ er rr P- P- Cfl Φ PP 3 he 3 d öd P- Φ P- φ d P, 3 d: Φ d cn P ^ d P Φ CΛ O o 3 P- d PP Hi P d, χj φ P , iQ ≤P i ^ p- φ ≥ 1 dd P * ddO tQ dd P d φ er o φ rt P- 55 1 P, d P- rt P- φ φ Q Ml rt φ φ PJ P- φ Φ d Hl i r + P, P s: cn φ ö N n P, d ω d φ φ CΛ φ P- H! X

0047P P- 3 CΛ ö d P- O "5 d- rt- Cfl d Cfl HP s: α rt d H d cn φ rt π_ cd P o φ d P P- P d rt Cfl φ tr¹ d rt Φ d N o iQ α N Cfl rt Ω Φ t__ p iQ tr H Cfl Φ Φ P_ ι-3 d &lt;! d Φ H P- Φ Φ P- d Φ P. Cfl Φ P d rt tr P,

0048__j cn d Φ Cfl P- f

0049►§ sd t__ P- &amp; d 3 Cl ddd rt n Φ er X rt P, Φ Φ rt d

0050P> Pd PO Pd 1 Φ Φ __J P- Φ P- - Φ P, Φ rt φ P- P- Φ

0051CΛ ιQ 3 HI o P- n P- rf P¹ P i-i P C r + dd cn ≥ i he d φ &lt;P-φ d &lt;Hi d iQ d

0052&lt;J o PP φ od φ rr dnd N P- o P Cfl H φ d = d

0053O α P_ PJ d ≥ i P. d P φ • Hi t 0-P- P rt ≤. H d H d • dd he PH α d M n φ φ d iQ φ d φ d P- i φ dd N • P- φ fl P- φ N HI P iQ P-

0054Cfl P. M H- Cfl d 03 d α P- 3 P- Φ dd Φ "3 Φ ds:: 1 rt d

0055PJ p. d iQ r + rr P -φ φ rt H-φ⁾-i σ ⁴ P- Φ P- iQ Φ 3 P. tr er S s Φ d Φ P- Φ P- 3 3 rt ö P- P- Φ P- Φ lO d! = R ≥: ddd O: H-

0056P Φ Φ 1 PP d ι Q PPP d P- Φ P- d Φ Φ P d δ d P cn iQ Ω φ ι r P¹ CΛ P Φ cn Φ NO rt- Φ dd rt Φ 3 dd rt P- iQ Ω Φ tr

0057PP P- HS Hi ri φ P s: d P¹ Φ P- 3 π cn cn N φ tr P P rt

0058P d O Φ: 1 P, Φ d fl P rt ^ P¹ _ iQ Φ d vQ rt &lt;! Ω d

0059CJ P d P Φ P. α &lt;1 P-P- Φ 1 μ-P Ω Φ P-cn d &lt;Φ H cn Φ Φ rd

0060Ö^* rr iQ P P- P φ φ 3 rt μ_ι P- CΛ Φ dt P φ 1 od^* Φ rt 1 P iQ φ φ dd φ ded H φ 1 d φ H Hi 1 3 p, 3 φ P- φ P d Hi d P- 1 φ 1 d φ P rt φ P ldd P. 1 1 P- 1 ω P-1 1

0061CO O for P¹

0062Cn o Cn o Cn o Cn rt iQ rt rt Pf rt P- rt Φ CΛ CΛ CΛ rt P- H 3 Q. Cfl 3 rt he Pf rt ^ ios: 'τ) 3

0063Φ P- Φ d P- P Φ P Φ P- Φ Φ Ω Φ d 3 d fe Φ Φ Φ P- Φ P. Φ Φ Φ P- P P- Q Φ P- d "3 dd ιQ p^j he dd cn cn tr P __J P; O P- φ P d LQ P T. P rt rt iQ iQ ^ rt φ er φ cn cn ω Ξ Ω P> dd cn d td • d P- I Cfl rt

0064• cn Φ Φ p: Φ P- PP P- P- d: Φ φ tr £ d, O rt P- μ- S Φ &lt;! Ω

00653 P P- PP d Cfl OO cn Φ d P- Φ Φ α Φ CΛ P- P- dd Φ r rt Φ tr d td φ wdd? P P- P dd cn P- Φ rt Φ P- Φ h-¹ Φ φ Pi tr φ P- P d

0066P-PP Φ ö d cn 3 H PJ Φ d P Φ P-dd Ω Cfl P¹ Pd φ N d φ Hi d: iQ dddd P σ σ P^J Φ P d φ d tr Cfl cn? T d P- d Φ P Cfl <img file="WO02082768A2_D0001.tif" /> φ dd φ P d rt Cd Pf cn cn - φ φ d Cfl φ P- s: P iQ rt P- O: s tr Cfl d rt d rt φ s: ud d NP P- d td tp φ o φ rt Cfl iQ iQ Hi φ P φ d

0067C iQ Φ P- P P- rt d Φ α φ NP P- er d P- P- 3 ^ rt Hi P- Φ P^J P er s: d &lt;! s: d φ iQ P cn cn d φ s: d XJ rt φ H cn O o P- Pl φ dd Ω

0068Φ P3 d φ d iQ φ PP rt 3 S P- Pi φ l ι P- U Φ d PH __! Φ ddd tr

0069P! __ PPP: cn d 3 iQ cn φ PP P- 2J ω d 3 2J P- rt d _^~. iQ rt __J α P- er P, Φ PV Φ pd: Ω cn P 'α rt Φ T3 Φ φ CΛ P d iQ> τ) cn

00701-5 r Φ Φ P- φ d rt d Φ rt Φ tr O P Φ 3 P- P P- Φ cn 1 • Φ P- Q &lt;P

0071P • d "_^ Φ P- ιP P- d rt Φ ds: Cfl PP Φ H d cn öd Ω ι-3 TJ Φ cn iQ PJ α ιQ Φ Ω P- d: p- d P- N ddo O φ cn S u Cfl t_ • • P ddds: tr Φ 3 iQ Cfl Ω ^ Q φ P d iQ P¹ cn P^J P- I Cfl P- Ω φ zj H) &lt;d H- Φ d P- ex Cfl Φ P P- C tr tr iQ P- • s: i cn o O Η Φ tr d P¹ l ^ P Φ iQ α P d LQ P P- P- P rt Φ φ Φ H3 φ er o Φ rt *. d O Φ Φ P tr P

0072P rt Cfl α φ d φ rt φ P l-¹ P fe P m rt P¹ P- OJ Pf ≥i N 3 CΛ 3 Φ P er α cn P- 3 P- • P Φ? T rt 3 __5 iQ hy. ω Φ P-α P-Φ P Ω P-rt Φ P-φ P-Hi O P-PH • P-cn P-POP¹ P Φ 2j P¹ φ P- rt • d Hi rt r rt dd

0073P <. d Pd dd d dds: d dd υ dd P- P- P^J * <α φ I d φ P- φ φ d φ d Hi P- x: & peseta; φ H ø cfl d cn: φ s: d td P φ P φ d α φ d P rt P d P-¹ rt fl o Pd P- Ω d Ω n P- IO P- d φ er P- rt P- rt φ α P ^. Φ Ω Φ [I rt φ tr iQ tr cn do P iQ cn P- d P- S d P- PQHO s: φ S Ω P- φ d tr ier φ φ P- φ φ φ φ O P. cn cn rt d φ O 1 φ Pi d = P- d = P-d 1 tr ιQ rt cn P- P- ιP PH Φ Pl P^J 3 o 3 p: 3 d 3 P- Cd d P CΛ P- P- cn $ rt Φ P-Pf JJJ α er O rt do φ rt tr rt C ^ m (-> O Φ N P- P Φ er __J P <! I

0074Pd CΛ CΛ ≥; CΛ P fl P- Φ P- P o P P- d PNP P- 1 d Φ Φ P> P Φ φ P P- d Q iQ Ω Φ Ω rt rt iQ P- iQ d cn dd P φ d tr φ N rt P d Cfl P 3 P-cn d cn tr cn P tr P- p: i T rt ^ s: d N Φ P-d 3 l-¹ d P P- φ rt cn O d 3 P cn d = PO rt φ φ P- d CΛ N s: rt tr Pi P- P- 3 φ Ω CΛ P P- S iQ O P- p- Ω P- d P- P- ^ 1 P- P d iQ O d φ N α P- pt Hi Hi tr Ω φ 1 ω α rt O rr iQ rt P- rt d φ Φ £! d Φ Φ Pi. ? cn P- P P- φ P^J dt rt CΛ d Cfl P cn α o P- Ω 3 P- P P- P? Cfl d = P- * -__. n

00753 d = Cfl o

0076Φ er Φ d 3 α α P Ω iQ tr Pl rt ^ 3 rt s: P Cfl d Cfl Ω s: -2!

0077H- CΛ φ CΛ cn LQ PPP H- P. α tr Φ Φ PVPPP P- Φ rt t Cfl tr &lt;! Φ

0078S CO ö P cυ cn Cfl d 1 d Φ P- d Φ d cn d er rt Ω o P- P- φ Φ Φ P- <1 d 1 3 P- 3 Φ> Φ Φ Φ P o er cn d iQ P- tr d rt O φ φ PP Cfl φ do φ P- φ O φ PPH rt 3 g φ rt? Φ O Φ d P- P rt 3 s; φ PQ o P- P rt P- d P^J P- P P- H Φ o § P- rt d CΛ P dd. o Φ cn

0079≥! d iQ rr d α ddd φ d P- φ cn Q. P φ φ o φ φ d Ω

0080PJ Φ Φ φ Φ H d Hi vQ Pi d Φ dd O p- α d PJ P Cfl O o P d α P tr t __ P iQ α do φ o rt d W • P- φ Φ Pi | He 3 Hl P- Φ cn P-¹

0081__j d: öd φ rt * i iQ POP P rt P φ cn φ 2J f P- Φ ^•he d:

0082M Ω φ d • φ P 3 P 3 Hi P- H- IS Pf S d O P- or PP φ l tr d: PP P- Pi &lt;! 1 d cn φ Od φ P φ dd P- s • er Cfl

0083I Cf 1 Φ cn = = rt P PJ cn rt d rt P- P CΛ s: P- d Φ d H Φ> <cn CΛ ffi; φ er he p: d φ φ P- φ P- P; rt m ^ d. φ α P rt ö P Pf P- Ό PJ P- P

0084Φ Φ rr cn P d PO rt O rt P Φ o P = P- d α S rt P- s: ö φ P- o φ d rt

0085PP P- ^ 3 d 3 d φ d P- rt d fl d φ P- P- Pi P- p: φ P d •

00863 1 iQ pj: Φ iQ P- d O P- 3 P * φ iQ d O P cn tr ti N er rt α P- = P &lt;* = rt vQ P- PO P- φ cn ¹ d rt d Φ s: p- d Φ φ

0087P rt 1 1 P- ^■ 1 P- ö dd rt d P- Pl P rr fl Φ P iQ P-

0088Cfl 1 1 1 P 1 1 P- 1 Φ P-Pi Φ cn r 1 1 1 1 1

0089Internet is again based on the HTTPS protocol. In addition, the confirmation message TAN2 is encrypted by the memory module M-STO before being transmitted. The encryption method, in turn, uses the PGP method. In this case, the confirmation message TAN2 is encrypted with a public key assigned to the connection module M-CON. The connection module M-CON can decrypt the received acknowledgment message TAN2 by a private key assigned to the connection module M-CON.

00903 shows a schematic representation of an exemplary confirmation message TAN2. The confirmation message TAN2 comprises two parts. The first part comprises an address information URL with which access to the data or services of the data server SD can be carried out. The second part corresponds to the message TAN1 or contains an identification SessionID generated by the memory module M-STO and formed by other unique and identical design principles, which can be uniquely assigned to the message TAN1 generated there by the connection module M-CON. For example, the confirmation message TAN2 could have the following form:

0091https: // www. firma-a.com/serylet/M-CHE?RequestID=5634636&amp;Comp anyID = company-a &amp; SessionID = 23497278 &amp; TANCreationTIME = 293478293 &amp;<img file="WO02082768A2_D0002.tif" />

0092Due to the fact that the current address information URL required for access to the data server SC is transmitted in the confirmation avoidance TAN2 to the connection module M-CON, a user does not need to know the address information URL before accessing. In addition, the address information URL in the first unit Company-A can be changed as desired.

0093In the following, reference is again made to FIG. Has the

0094Connection module M-CON received a confirmation message TAN2 and decrypted, then in a step S4 by the Ver> O ⁾ IV) P¹ P¹

0095Cπ o cπ o Cn o cn

0096&lt;cn rt Cfl Cd Pi P- LP d α cn cn 3 Cd rt N d P ≥i P-? rt Pl CΛ Pi rf -φ Pl Odd ≥; φ Ω φ rt d P φ φ P φ φ: P P φ φ φ P ddd φ μ P φ d φ P d φ tϋ d P

0097P tr d Φ P ι rdd Ω tr PP Φ PPP Φ Pi rf P- o r r cn d rt d rt μ--rd er Ω P • *_* tr • &lt;i rt P-d φ d iQ ISI φ rt d P Cfl iQ • φ N α

0098Hd = P- P¹ tr rt Φ rt iQ Φ P- iQ Pf Φ ≥; μ- Cfl Φ Φ P- CΛ π rt p- and P Φ μ- Φ dd cn 3 rt P- α P P. P^J P ι Φ Q. rt dd rt he P dd P- 0 P- Cd er d μ- d P d

0099P- Cfl •_^ p. o φ 3 P- φ td φ rt P φ P φ φ P od φ φ d φ iQ d φ Pl P- d P oα φ φ P- CΛ Φ d Φ N P- d P- 3 d Λ df PPP rt Φ ^ P- cn d P α Φ d tr Ω 1 P- &lt;! rt P φ Ω α rt d φ φ ö Ω d 3 O d 3 Q d rt P CΛ N iQ P Pf tr Cd rt φ μ-Pl P tr Φ_"* P ω P Cfl C Λ tr P Φ PP fldfl Φ Cfl &lt;! Φ d P P. Φ • P Hi O Φ rt ω P- φ cn φ 3 Φ d: P- 3 μ- α

01003 iQ P ω Φ Cfl P- P φ d P er μ- H "μ d cn Ω Ω p. Μ cn P- P- Q. Pi d Ω do PP cn φ Hi dd td P- iQ dd CO tr tr φ o cn rt 3 P d φ Hi φ tr α α φ φ z P- P- H) fl rt cn P- d P rt P ιp P rt cn P d P c n d P P rt d φ rt P- φ O d P- α ιΩ d α rt P- rt d rt O &lt;iQ ddd ^

0101P ddd φ φ ^ Pi φ φ d μs; Ω o φ P d φ Pf Cd d φ φ cn φ Hi φ d 1 cn H 3 P-: P- d trddo μ- tr d cn υq d JPP er 3 P cn vP n ö φ cn d Cd d W rt Φ O &lt;Q d Φ rt 3 Cfl Cfl Φ Φ Cd er Φ o er o is; PPO d cn φ rt P P -d Ω Cfl d O: φ O cn d μ- • P- P- P P- φ t-¹ n 3

01021 rr tr ^ P iQ φ O Cfl P- rt Hi tr P CΛ φ d ι P d Ω rt ddd • dd cn μ- o φ P- φ P p: ιQ P- P- 3 d φ P iQ &lt;l P d tr μ-tr¹ P α d P iQ

0103O d P d P rt d O r P Pi CO d μ- φ Ω PP Hi O P- α dd: d tr¹ ^ d Φ

0104≥! α P Φ P Φ dld PO P- C Cfl 3 O Ω P tr α P- μ- o Φ Φ d Hi S d μ- Cfl Cfl cn

01053 Φ d cn d P er H rt d P- P μ- tr cn Hi rt? Cfl Pi P ιP d 1 ιP d ιP rt d P- P d iQ φ φ P CΛ P- Ώ do P do rt P P- φ cn dot φ φ φ d rt rt rt k rt d P Cfl φ O φ φ ddd μ- CΛ P- * φ rt rt P cd P ι td N cn d ι d α φ Pl φ Cfl Cfl d P- P 3 ll Pi 03 1 iQ 3 CΛ μ- P- rt P d cn td d rt Φ Φ α s; cn PJ tr oα Ω P- Cfl d P- Cd rt Cd Φ CTl O rt l 3 3 ≤. he P

0106P. φ P- πd P φ tr Pi P- CΛ φ &lt;! rt öd α • d ü d φ α φ er o P p- p: φ rt

0107Φ d P CΛrr P- rt P- O φ P Φ er P Φ PP φ Cfl P- d P P- d UP μ^j d -J cn α g 1 • rt P- N d cn P α Φ cn 3 td d rt P-Pl Φ er dd Hl P rt _^ Φ

0108O: • P- Td * d ιQ P- f cn φ er φ Cfl P- μ- Cfl φ φ P Cd td P rt • P-

0109CΛ Hi rt P d rt Φ Cd P- μ- 3 μ- Cfl α d iQ P- d φ P o 0) d: P. Φ P- s: d

0110Hi ö tr O d φ PO rt d rt P φ φ d CΛ d Ώ er P- er d Φ Φ φ Φ d O: rt I d rt s- d Φ α - N P- rt tr s φ d

0111Φ &lt;o φ Φ cn Φ 1 3 cn

0112Pd PPO rt • P- Pf P d er φ φ Cd φ NP φ Ω er PP o Φ Φ Ω CΛ

0113Ω rt Ω Φ I ≥! P Cd dd Φ Cfl d P dd &lt;P tr d ^ Cd 3 wd P P tr Φ tr tr d d C d α Φ iQ PC fl rt ιq Φ er P- P Dd P- td P &lt;d Φ P-

0114Φ P- * P * Φ rt O P -d cn Ό PK φ Φ PP P- d cn d: rt rt Φ φ rt

0115P Ω P "d N 3 he cn PP he PJ P d P- d P- Pi ι rt φ Φ P 3 Φ

01163 tr P- P * cn d Φ P- Φ rt add = Φ PJ &lt;! d: o Hi CΛ P, Ω dd Φ Φ P d μ- o Φ φ φ rt P rt P d Pi Pi d d Φ d d Hi 1 d tr dd ω Pi cn CΛ CΛ φ P d P s: d Cfl 3 d rt er d CΛ P Φ Cd d rt ιp * d rt o φ 1 Ω 3 d N P- P- P- NP dd 1 PP ι φ Φ P Cd tr

0117CΛ d: P cn d PN Ω Φ d iQ d Tj CΛ 3 Φ dd: P μ- C P- d iQ &lt;! P α Odd cn Ω Cfl er α dds: tr P cn PP 1 P- P Hi n cn φ Ω rt φ P μ- PP tr p: φ &lt;! rt d Φ rt φ 3 3 o rt Φ s, ιP rt p tr Pl P d rt φ o

0118S rr P fl O Φ μ- p. μ- O Hi rt rt φ α P P- φ φ P_ φ Hi rt Cfl s:

01191 d = N 3 P- d P Φ rt 3 d π- P,: o: H μ- Cfl α P Φ P- CΛ ι P Cfl cn

0120CΛ Cfl H P- Ω er P- φ φ P d P er d rt φ Ω P μ- rt dd 1 φ CΛ μ- Φ

0121Pl cn P- rt tr α ddd tr P- P- P^" o Φ d Φ P tr d Φ Φ Φ rt Φ Cd er cn d P o Φ Ω rt Φ Φ PP Ω Φ φ P iQ P Cd cn Φ Hl dd P- P l

0122P^" tr Φ PP P- d tsi tr 3 S P- d P d Φ Q rt Pi - ι dd = o Od s: d φ iQ φ P dd: μ- Pf P- φ rt σ P

0123P- 3 rt 1 d Cfl P. N φ rt pf d rt φ Pf d Ω ιp O: d Cd n φ • P s: d φ d * Ph P -w φ ω φ 3

0124P P. &lt;Φ 1 α tr P ι d P tα d ω P- d rt φ rt μ- φ PP rt d PP φ α φ φ d φ * Hi P- iQ rt td fl ≥; Φ P s: μ- d rt * d P d rt P cn P d Φ o Pi μ- Φ φ f Ω dd P P pp P rt P- PP P- - P-

0125N 1 Cd rt P Pi Ω

01261 3 d P- d tr r dd P 1 1 μ- o = 1 P od P P -1 tr p- 1 d 1 Φ 1 φ 1 d 1 cn d

01271 1 1 rt 1 d rt

0128<img file="WO02082768A2_D0003.tif" />

0129&lt;55 P Cfl N tr rt Cd S d rt P-. cn Pi &lt;J Cfl H öd ω PP, d rt α- Cd 3 d cn

0130Φ dd φ o φ φ P φ P 1 φ φ φ P-1 d: φ φ d φ rt er φ φ φ er PO: φ p:

0131P rt rt P 3 P μ- Clf d fl PPPP Cd PPP rt μ- φ Φ 3 d Φ 03 ι rt rt

0132Pi ON μ- Cfl rt Cfl 03 od 3 er <P 3 d P '>_* •>. P! -^■ cn N

0133PP Φ &lt;! rt Φ φ ≥! öd Φ ιO P P. Φ μ- Φ P φ N cn &lt;P- P- tr P- P o P h- CXI PP φ rt d 1 d P- d P d &lt;1 P μ- P- φ P φ Ω P-

0134P Cfl PP d μ-d &lt;. P i φ O d d φ μ P = P tr φ Ω

0135Φ P- &lt;rr d Hi P iQ Φ P- 3 d P Ω Φ d C Λ rt PP Φ Hi he P tr d Φ O Φ Cfl 3 PP d rt d μ-¹ P- tr dd 1 03 s: Ω 03 d P- ιP

0136P d P- P P- α lO N ι CΛ Φ iQ lO μ- Φ tr Φ P φ dd Φ φ φ cn d P- cn P- 1 Hi CΛ dd Φ φ φ Pi ESI cn φ PP d rt ^ P 3 P P- rt d μ- φ> Hi 1 d Φ POP P- P- d 3 er Φ ι td <Hl 03 CΛ d P cn d

0137Φ iQ Φ α Ω CΛ Cd vQ t P &lt;d Φ iQ o NP φ Φ P- Φ ^ 3 d Ω rt

0138P φ tr Cd 3 P co P P. φ P- P s: ddd P l rt P μ- φ π ιP ω φ α o iQ tr φ 5

0139P "Ϊ Cf d P φ ≥5 P- d. N P-φ P φ P α 03 rt P i ≤ rf φ α rr rt Ω φ φ φ P-φ P d Hi s: φ P cn d φ d 3 μ-

0140P- Φ Φ Φ ιp tr p- 3 P C rlt C rt rt Hi P φ d he 1 P od rt cn d 3 P φ d φ rt dp: &lt;1 • NS d P- φ N l_l-d tr

0141P- Φ Hi P rt φ φ &> φ Hi P- O φ P 1 Pi rt d φ P- S d O:

0142Ω α μ- er Φ Φ P d: cn P dn φ dds: cn 1 P tr ^ P d φ N μ-Hl öd d P rt P- Hi od Cfl P d φ P- o P- φ

0143Φ rt P s: P¹ d: Φ cn 3 rt α ≥! P Hl 3 P- P- φ K ts φ d cn d φ d cn • rt PP &lt;1 φ φ φ P- 03 td d = h-¹ P td 1 P ^

0144O ddd rt Φ Φ O P- s: 1 p cn P- P trd P- rt o

01453 rt 1 ι Φ Cd z Ω P d O d φ C Λ P d PP Φ ι P CΛ o N

0146P- d cn d μ- Φ P- tr Hl Φ er Hl P Pf od tr d O 3 Φ μ- 55 s: φ rt μ- er ιP Φ P φ rt P φ d φ d = rt d Cd 3 Hi φ d £ dd Φ P cn N Φ td d α P- tr Pl P- P P- rt P μ- P- ιP cn Cd P-

0147P s: 3 P-Cfl Φ 55 ιP P P rs ι P rt rt rt Cfl φ P cn tr

0148• P- rt d =

0149P^J Φ p: d rr dd rt Φ dd P-1-P Φ Φ er P rt φ &lt;! P olf er oo

0150Cfl P δo tr Φ rt Φ d μ- ^ d Φ? dd μ- 3 ^ Φ Φ P o cn d Φ μ^j Cd Φ φ 3 N d Φ PP Φ cn P- P- Cd d &lt;! φ PP

0151Cfl P P- d μ- P. d = φ 1 tr P P- φ d rt rt ι O P 03 cn φ Cfl rt CΛ td rt 3 φ d φ φ 03 P &lt;P rt Pi μ dd cn N d 3 * d

0152Φ α Φ P φ • d P- P -tr iQ d &lt;cn 03 d φ rt Hl s: L φ P μ- φ P d tr μ- φ d rt

0153P rt Cfl Φ • ^ 1 φ P s: 0) 55 P Φ 1 Φ P &lt;! P P-¹ P rt rt

0154• P r P μ- Cd P d P, μ- P φ dd φ P öd φ 1 d tr Ω φ φ d φ HI PP • μ- P φ P d 3 rt Ω P Cd cn 53 PP tr P- d Cd NP 3 rt Ω d P. Hi N tr P- er φ N tr d φ Pi φ rt rt P d tr P φ Cd tr rt • d d φ N φ φ P d P rt CΛ φ rt P Φ

0155N cn ι P 1 d Φ rt d <α PP <! s: d ι <! ι N 1 3 rt Φ 3 ^ d φ P φ> cn P do PP¹ o Φ cn P Φ P Φ Φ Cd P o μ-

0156P Φ P- d Φ P ι P P Cfl P¹ NP P- rt Φ P Pd P ιO 03 s: P Cd

0157Hi P Hi p PP rsi d rt d ιP rt φ d Hi φ 1 d P- φ d 3 P

0158P Pi Hi d &lt;! d φ φ φP φ φ N CΛ HiP P- φ Ω P- P rt φ p- P φ φP Φ P- Φ μ- p: CΛ d rt 1 PPH tr CΛ 1 Φ dd &lt;Cfl d PP μ - d P dd φ φ φ! θ PP er φ S dd O rt ι p- φ O: he iP tr td cn d φ P- Cfl d 1 • d P_^ 3 cn Hi rr μ- P Φ P- d P Hi Ω P Φ 3 P CΛ μ- h- "d ιP • 1 Hl φ P- d he P- dd Cd Φ he 55 tr d P PJ ^ dd

0159P- ιP Φ P, Cd P ιP P ι Ω tr PP P- d rt Pi &lt;03 o μ-

0160Ω cn Cfl P td φ CΛ rt fl d φ tr cn φ rt cn P φ rt d φ φ »d P tr" 3 Ω Cfl P- φ P- rt cn d cn φ φ P- φ O dd N dd P ^ Cfl d 3 Φ

0161Φ tr cn d P d φ z ιP Ω d P-rt dd Pi Φ iQ or PP

01623 P Hl φ μ- μ c tr d cn φ φ OP CΛ μ 1

0163P p: Φ zo Cfl td P 3 3 1 Φ ddd O 1 i " φ dr H

0164P Then P- P * μ- oo P?

0165• α Φ P-OP dd

0166Φ φ d P- iQ ≥; d_^ Cd P- co Pf P-! P Φ P φ r r t d d d d d PP r r 1 1 1 1 1 1 1 d t fl fl fl 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1¹ 03 Φ μ d 03 d P

0167Φ Φ rf n 1 φ I Cfl P P- 1 1 O d 1 P d 1 1 o 1 Cfl cn 05 1 1 1