Stream Cipher KCipher-2 KDDI Corporation 1 Introduction This documentation gives a detailed description of a stream cipher (keystream generator) KCipher-2. KCipher- 2 uses two independent parameters as input, a 128-bit initial key and a 128-bit initial vector. The document is organized as follows: In Sect.2, we describe the design rationale of KCipher-2. Next, we give some notations and deï¬nition
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