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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

Active Publication Date: 2015-06-03
INSTITUTE FOR INFORMATION INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of data to be encrypted is large, doubling the time consumption is still a non-negligible burden for general applications

Method used

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

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no. 10 example

[0181] The tenth embodiment of the present invention is a computer-implemented block encryption method, the flow chart of which is depicted in Figure 8B . The operation principle of the tenth embodiment is the same as that of the ninth embodiment, but this embodiment uses a known encrypted block interlocker to complete certain steps. Only the differences between the tenth embodiment and the ninth embodiment will be described in detail below. For ease of understanding, please refer to Figure 3C .

[0182] Similarly, the block encryption method of this embodiment first executes steps S700, S701 and S703. Next, step S811 is executed to perform an XOR operation on each of the message blocks and the previous message block to obtain several temporary blocks. It should be explained that when the first one of the message blocks is processed in step S811, the preceding message block is an all-zero vector, and when the second one of the message blocks is processed in step S811, T...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06
CPCH04L2209/72H04L9/0637H04L9/32H04L63/0435H04L63/123G06F21/6209H04L9/0618
Inventor 颜嵩铭涂政宏吴瑞明
Owner INSTITUTE FOR INFORMATION INDUSTRY
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