Data encryption apparatus and method, and data decryption apparatus and method

A data encryption and data decryption technology, applied in the field of data encryption and decryption technology, can solve problems such as slow encryption speed, achieve the effect of rapid encryption and reduce the amount of calculation

CN107637010AActive Publication Date: 2018-01-26SAMSUNG SDS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-01-26

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Abstract

A data encryption apparatus and method, and a data decryption apparatus and method are disclosed. A data encryption apparatus according to one embodiment of the present invention comprises: a divisionunit for dividing data into a plurality of plaintext blocks; an encryption unit for encrypting at least one of initial values for encryption of data and some blocks among the plurality of plaintext blocks, using a cryptographic key-based block encryption scheme; and an encoding unit for encoding the remaining blocks among the plurality of plaintext blocks, which have not been encrypted by a predetermined block encryption scheme, using a non-cryptographic key-based encoding scheme.
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Description

technical field

[0001] Embodiments of the present disclosure relate to data encryption and decryption techniques. Background technique

[0002] For conventional data encryption using the block cipher (Block Cipher) algorithm, if the encryption key is exposed to an attacker, the encrypted data can be decrypted to expose the data, so the protection / management of the encryption key becomes very important. Important issues.

[0003] Generally, in data encryption using a block cipher, the length of an encryption key, the size of a cipher block, and the number of rounds are elements that affect security. Among them, an operation mode (mode of operation) when performing encryption processing by dividing a message in block units also plays an important role. Encryption is performed in block units using a block cipher algorithm in operation mode, and all blocks are encrypted with the same encryption key.

[0004] However, in data encryption using a conventional block cipher algori...

Examples

Embodiment Construction

[0069] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to facilitate a comprehensive understanding of the methods, devices and / or systems described in this specification. However, this is only an example, and the present invention is not limited thereto.

[0070] In describing the embodiments of the present invention, if it is judged that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described later are all terms defined in consideration of the functions in the present invention, and may vary depending on the user, operator's intention, custom, or the like. Therefore, it needs to be defined based on the contents throughout the specification. The terms used in the detailed description are only used to describe ...