Secure communications

A providing privacy communication between the first and second communication unit method, comprising between the first and second communication device with key exchange for sharing secret key, wherein the switching key is interactive comprising a user; The method comprises the following steps: At least a part of alternate the the first user and second communication unit for providing intervals; codeThe first communication unit to the sharing secret key first adding, and is the second communication unit to the sharing secret key second component; each component and according to generate is connected to the corresponding communication unit; The corresponding receiving the communication unit based on at least to the password code, first and second component and authentication to the transmission; And installed on the corresponding successfully receives component by authentication, wherein the communication unit at least to the corresponding first receiving or adding the second component of each supporting arranged on the sharing secret key.