21 st century is an era of wireless world. The cause of the current trend for wireless applications is the improved data rate for multifarious applications of communication. But during communication, the data might be distorted due to impairments of channels. Reduction of error due to noisy channels becomes critical. Novel high speed VLSI architecture for encoding Reed Solomon codes are present...

Algebraic attacks on stream ciphers apply (at least theoretically) to all LFSR-based stream ciphers that are clocked in a simple and/or easily predictable way. One interesting approach to help resist such attacks is to add a component that de-synchronizes the output bits of the cipher from the clock of the LFSR. The Bit-search generator, recently proposed by Gouget and Sibert, is inspired by th...

In this paper, we present a correlation attack on Sosemanuk with complexity less than 2. Sosemanuk is a software oriented stream cipher proposed by Berbain et al. to the eSTREAM call for stream cipher and has been selected in the final portfolio. Sosemanuk consists of a linear feedback shift register(LFSR) of ten 32-bit words and a finite state machine(FSM) of two 32-bit words. By combining lin...

This paper investigates the design of S-boxes used for combining linear feedback shift register (LFSR) sequences in combination generators. Such combination generators have higher throughput than those using Boolean functions as the combining functions. However, Sboxes tend to leak more information about the LFSR sequences than Boolean functions. To study the information leakage, the notion of ...

As the number of specified bits of different test patterns varies widely in a deterministic test cube, all test patterns are concatenated to a data flow. The original test data can be re-divided by 2 to the power of integer according to the successful characteristics of the LFSR coding, whose length equals to the power of 2 in every division. In the new test approach, the numbers of specific bi...

This paper proposed a “Dynamic key generation” for DES algorithm which makes DES strong. DES is acronym for “Data Encryption Standard”. Based on the analysis of DES algorithm, the generation of sub key and its arithmetic is weak, so that key generation can be reconfigured. For key generation, we can use three modes, first one is “Direct key” by the user, second one is key shifted through “LFSR”...

Grain [11] is a lightweight stream cipher proposed by M. Hell, T. Johansson, and W. Meier to the eSTREAM call for stream cipher proposals of the European project ECRYPT [5]. Its 160-bit internal state is divided into a LFSR and an NFSR of length 80 bits each. A filtering boolean function is used to derive each keystream bit from the internal state. By combining linear approximations of the feed...

Radio Frequency Identification (RFID) technology is an automated identification technology which is widely used to identify and track all kind of objects. However, it is a challenging task to design an authentication protocol because of the limited resource of Lightweight RFID tags. Recently, a lightweight RFID authentication protocol and an ownership transfer of RFID tags are presented by Kuls...