Communication method and device

Abstract

The invention discloses a communication method and device and belongs to the field of communication. The method comprises the steps that a receiving end receives a communication frame sent by a sending end, wherein the communication frame comprises a sending time module value and encryption data, the sending time module value is a value of modulo-m operation of sending time for sending the communication frame by the sending end, m is equal to 2N, and n is a positive integer; the receiving end determines receiving time for receiving the communication frame; the receiving end analyzes the communication frame to obtain the sending time module value; the receiving end computes the value of the modulo-m operation of the receiving time to obtain a receiving time module value; the receiving end computes a difference value between the receiving time module value and the sending time module value in order to obtain a module value difference between the receiving time and the sending time; the receiving end determines the sending time of the communication frame sent by the sending end according to the module value difference and the receiving time; the receiving end adopts the determined sending time to initialize an encryption algorithm; and the receiving end calls the encryption algorithm to decrypt encryption data in the communication frame.

Description

technical field [0001] The present invention relates to the communication field, in particular to a communication method and device. Background technique [0002] When the communication system transmits data, in order to ensure the security of the data, it usually needs to encrypt the data, and then transmit the encrypted data. [0003] In order to make the encrypted data have a better anti-deciphering ability, it is usually necessary to transmit a message key of 128 bits or more for password synchronization between the two communicating parties. There are two existing conventional key agreement methods, the first is to use physical noise sources to generate random numbers to achieve password synchronization, and the second is based on TOD (Time Of Day) password synchronization between the communication parties. [0004] The first password synchronization method needs to occupy more communication bandwidth, which will bring a large system delay and reduce the performance an...

AI Technical Summary

Problems solved by technology

[0004] The first password synchronization method needs to occupy more communication bandwidth, which will bring a large system delay and reduce the performance and efficiency of the communication system.

The second password synchronization method saves communication bandwidth, but requires the time of the two parties to be synchronized. If the time of the two parties is not synchronized, the encrypted data cannot be decrypted normally.

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