On Cipher Design Based on Switchable Controlled Operations

摘要

This paper introduces a new type of primitives called switchable controlled operations (SCO). The SCO are proposed to be used in the design of the fast ciphers suitable to cheap-hardware implementation. Use of the SCO promotes to solve the problem of the weak keys and homogeneity of the encryption transformation while the simple key scheduling is used. The SCO-based iterative ciphers that are free of reversing the key scheduling are proposed to minimize implementation cost. Different variants of SCO and SCO-based iterative cryp-toschemes are considered.