Block encryption device, block encryption method, block decryption device and block decryption method considering integrity verification

A block encryption and block technology, applied in encryption devices with shift registers/memory, secure communication devices, computer security devices, etc., to achieve the effect of satisfying confidentiality
CN104683093AActive Publication Date: 2015-06-03INSTITUTE FOR INFORMATION INDUSTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INSTITUTE FOR INFORMATION INDUSTRY
Publication Date
2015-06-03

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Abstract

An encryption method and decryption method are provided. The encryption method divides an electronic file into a plurality of message blocks, wherein the message blocks have a sequence. The encryption method sets a checking vector as the last message block. The encryption method performs the following steps on each message block according to the sequence: generating an input block, deriving an output block by encrypting the input block by an encryption key, and deriving an encrypted block by applying XOR operation to the output block and the previous message block, wherein the input block is equivalent to applying XOR operation to the message block, the output block corresponding to the previous message block, and the message block before the previous one. The encryption method generates an electronic encrypted file by concatenating the encrypted blocks. The decryption method performs a series of operations corresponding to the above operations.
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Description

technical field

[0001] The present invention relates to a block encryption device, a block encryption method, a block decryption device, and a block decryption method; more specifically, the present invention relates to a block encryption device and a block encryption device with integrity verification. An encryption method, a block decryption device and a block decryption method. Background technique

[0002] In one-to-one secure communication, only when the three basic security requirements of confidentiality, integrity and source authentication are met at the same time can the message transmission process be guaranteed to be safe and sound. Confidentiality means that the content of the message will not be obtained by a third party during the transmission process. Integrity means that the receiver of the message must be able to ensure that the content of the received message is consistent with the content of the message sent by the sender, that is, the content of the mess...

Claims

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