Abstract
For the published block cipher algorithm, the key design is an important part to a cryptographic system. Block ciphers used in networks environment take more risks than ever before because of their initialization key’s distribution in internet openly. But key algorithm and block cipher algorithm combined with model has been ignored for a long period. If the key delay technology is used, the speed of algorithm will be promoted and the chip’s area will be decreased with very low value. This article proposed an approach in block cipher’s key design against only known ciphertext attack. Furthermore, we discussed this design’s provable security according to information theory.
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