Dynamic secret key based data communication method, transmitting end and receiving end

Abstract

The invention discloses a dynamic secret key based data communication method, a transmitting end and a receiving end, wherein a transmitting end method comprises the following steps: the transmitting end generates a session key Ks used for encryption of communication data, Ks=HS (K1) * ORHT(K2), wherein the S is the value of a counter in the transmitting end, the initial value of the S is 1, S+T=n, and the value of the counter increases by 1 whenever a session is performed between the transmitting end and the receiving end, K1 and K2 are two parts divided from a secret key seed K, the length of the K1 is the same as the length of the K2, and the secret key seed K is a shared secret key preset for the receiving end and the transmitting end; the transmitting end encrypts the communication data through the session key Ks; and the transmitting end sends the encrypted communication data to the receiving end. According to the dynamic secret key based data communication method, the transmitting end and the receiving end, the forward security and the backward security of the session key are achieved, and therefore the security data communication is guaranteed; and the dynamic variation calculated amount of the session key is small, and the dynamic secret key based data communication method is easy to achieve.

Description

technical field [0001] The invention relates to the communication field, in particular to a data communication method based on a dynamic key, a sending end and a receiving end. Background technique [0002] A session key is a key used to encrypt communication content for a certain period of time or length. This key needs to be changed periodically for increased security. The forward security of the key means that even if the session key at time T is compromised by the listener, the session key before time T is still safe. The backward security of the key means that even if the session key at time T is compromised by the listener, the session key after time T is still safe. [0003] In the prior art, for the key management method, the forward and backward security of the key cannot be guaranteed at the same time, and some key replacement methods have a large amount of calculation and are relatively complicated to implement. Contents of the invention [0004] The technica...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a session key replacement method in the prior art that has a large amount of calculation, complicated implementation, and cannot guarantee the forward and backward security of the key at the same time. Forward and backward security, and the amount of calculation is small, to achieve a simple data communication method based on dynamic keys, the sending end and the receiving end

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