Digital content encryption and decryption method based on ARX white-box block cipher
A digital content and block cipher technology, applied in the field of network information security and information security, can solve the problems of high storage space cost, high storage space cost of decryption method, low operation efficiency of encryption method and decryption method, and achieve the speed of encryption and decryption Fast, low-cost decryption storage space
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[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0047] Refer figure 1 Further, the implementation step of the present invention is further described.
[0048] Step 1, generate a encryption key.
[0049] Using the key export function KDF, turn a 128-bit master key to 25 32-bit rotary key K 0 K 1 , ..., k i , ..., k 24 As the encryption key for digital content.
[0050] The key export function KDF refers to any of the output scalable functions in the safety hash granulian family of artifices.
[0051] Step 2, generate a decryption key using the ARX loop operation.
[0052] S1: Will 2 32 32-bit ratio of special strings 0, 1, 10, ..., 1111111111111111111111111111, respectively, respectively 0 Different or different or after 2 32 32-bit compared.
[0053] S2: After the high 16-bit cycle of each 32-bit bit string, the analog number of modulus is 65536 is performed with the lower 16 bits, and the highe...
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