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Selective Data Encryption and Decryption Method and Apparatus

[Category : - SOFTWARES]
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This present application relates to the field of data encryption and decryption technology, and in particular, relates to a selective data encryption and decryption method and apparatus. The encryption method includes: generating a string of true random numbers 0, 1 of a predetermined length via the preset method as a random seed
acquiring data for several times from the random seed, and cascading the data acquired each time into a random string no shorter than the length of a plaintext
according to the random string, generating a plaintext encryption bit identifier random string
randomly selecting more than one half of plaintext data for encryption according to the plaintext encryption bit identifier random string
arranging the encrypted data and unencrypted data to form a ciphertext according to their positions of the plaintext. The encryption apparatus includes: true random number generation module, encryption bit identifier random string generation module, plaintext selectivity encryption module and ciphertext formation module. This application also provides a selective data decryption method and apparatus. This invention reduces the amount of data to be encrypted or decrypted, thus improves the data encryption and decryption performance.

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