SNOW 3G is a synchronous, word-oriented stream cipher used by the 3GPP standards as a confidentiality and integrity algorithms. It is used as first set in long term evolution (LTE) and as a second set in universal mobile telecommunications system (UMTS) networks. The cipher uses 128-bit key and 128 bit IV to produce 32-bit ciphertext. The paper presents two techniques for performance enhancement. The first technique uses novel CLA architecture to minimize the propagation delay of the 2³² modulo adders. The second technique uses novel architecture for S-box to minimize the chip area. The presented work uses VHDL language for coding. The same is implemented on the FPGA device Virtex xc5vfx100e manufactured by Xilinx. The presented architecture achieved a maximum frequency of 254.9 MHz and throughput of 7.2235 Gbps.

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Sosemanuk is word oriented synchronous stream cipher capable to produce 32 bit ciphertext. It uses variable key from 128 bit to 256 bit and publically known Initialization Vector (IV) of 128 bit. Sosemanuk is one of the finalists in Profile 1 of the eSTREAM Portfolio. This cipher targets to avoid structural properties of SNOW2.0 to improve its efficiency by reducing the internal state size. It also uses reduced round Serpent24 block cipher to provide secure and efficient key loading process. This paper presents compact architecture for Sosemanuk stream cipher. The proposed architecture uses compact S-box architecture and compact modulo adders designed using CLA. The proposed compact S-box minimizes resources utilized without affecting performance. Proposed modulo adder architecture minimizes resources used as compared to conventional CLA implementation. The algorithm was designed by using VHDL language with CAD tool Xilinx ISE design suite 13.2 and implemented on Xilinx Virtex XC5VFX100E FPGA device. The proposed architecture achieved throughput of 4.281 Gbps at clock frequency of 133.788 MHz