| 摘要 |
An encryption and authentication technique that achieves enhanced integri ty verification through assured error-propagation using a multistage sequenc e of pseudorandom permutations. The present invention generates intermediate data-dependent cryptographic variables at each stage, which are systematica lly combined into feedback loops. The encryption technique also generates an authentication tag without any further steps that is N times longer than th e block size where N is the number of pseudorandom permutations used in the encipherment of each block. The authentication tag provides a unique mapping to the plaintext for any number of plaintext blocks that is less than or eq ual to N. In addition to being a stand alone encryption algorithm, the discl osed technique is applicable to any mode that uses pseudorandom permutations such as, key dependent lookup tables, S-Boxes, and block ciphers such as RC 5, TEA, and AES.
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