Abstract Cobra-H64 and Cobra-H128, which use data-dependent permutations as a main
cryptographic primitive, are 64-bit and 128-bit iterated block ciphers with 128-bit and 256-bit
keys, respectively. Since these ciphers use very simple key scheduling and controlled
permutation (CP) for fast hardware encryption, they are suitable for wireless communications
networks which require high-speed networks. Actually, these ciphers have better hardware
performances than other ciphers used in security layers of wireless protocols (Wap, OMA …

Cobra-H64 and Cobra-H128, which use data-dependent permutations as a main
cryptographic primitive, arc 64-bit and 128-bit iterated block ciphers with 128-bit and 256-bit
keys, respectively. Since these ciphers use very simple key scheduling and controlled
permutation (CP) for fast hardware encryption, they are suitable for wireless communications
networks which require high-speed networks. Actually, these ciphers have better hardware
performances than other ciphers used in se-curity layers of wireless protocols (Wap, OMA …