Sequence cipher encryption system key updating method based on hash function

A key update and hash function technology, applied in the fields of communication information security and cryptography, can solve the problems of suspending decryption operations and troublesome key security transmission, achieving high security, fast key update speed, and avoiding troubles. Effect
CN112615718AActive Publication Date: 2021-04-06NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Publication Date
2021-04-06

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Abstract

The invention discloses a sequence cipher encryption system key updating method based on a hash function, and belongs to the field of communication information security. The method comprises the following steps: initializing a key K0, and synchronizing the states of m sequence generators of a transmitting end and a receiving end and an integral shift register; performing encryption and decryption operation on the key Ki; inputting, by the m sequence generator, a 1-bit signal, and performing shift by the whole shift register; compressing the key Ki by adopting a hash function to generate a new key K; and when a key updating condition is triggered, enabling the sending end and the receiving end to perform key updating, and taking K as a new key. According to the invention, the problem of safe and rapid key transmission during key updating and encryption and decryption interruption caused by initialization of the key stream generator are avoided, and seamless connection of a new key stream and an old key stream is realized.
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Description

technical field

[0001] The invention relates to the fields of cryptography and communication information security, in particular to a hash function-based key update method for a serial cipher encryption system. Background technique

[0002] According to the characteristics of the encryption algorithm used, the cryptosystem can be divided into a symmetric cryptosystem (also known as a single-key cryptosystem) and an asymmetric cryptosystem (also known as a dual-key cryptosystem). In a symmetric cryptosystem, the encryption and decryption parties use the same key for encryption and decryption. The symmetric encryption system has fast encryption speed and small amount of calculation, and is suitable for encryption occasions with a large amount of data. The disadvantage of the symmetric cryptosystem is that the key must be transmitted in a safe way, and the key management has become a key factor affecting the security of the system. In the asymmetric cryptosystem, the encrypti...

Claims

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