Sequence compression is one of the most promising tools for strengthening pseudo-random generators used in stream ciphers. Indeed, adding compression components can thwart algebraic attacks aimed at LFSR-based stream ciphers. Among such components are the Shrinking Generator and the Self-Shrinking Generator, as well as recent variations on Bit-Search-based decimation. We propose a general model...

In this paper we design a stream cipher that uses the algebraic structure of the multiplicative group ZZp (where p is a big prime number used in ElGamal algorithm), by defining a quasigroup of order p− 1 and by doing quasigroup string transformations. The cryptographical strength of the proposed stream cipher is based on the fact that breaking it would be at least as hard as solving systems of ...

Thwarting severe cryptographic hardware attacks requires new approaches to logic and physical designs. This paper presents a systematic design approach to fault tolerant cryptographic hardware designs by combining the concurrent error detection and correction, and uniform switching activity cells. The effectiveness of the Hamming code based error correction schemes as a fault tolerance method i...

In this paper we design a stream cipher that uses the algebraic structure of the multiplicative group Z Z * p (where p is a big prime number used in ElGamal algorithm), by defining a quasigroup of order p − 1 and by doing quasigroup string transformations. The cryptograph-ical strength of the proposed stream cipher is based on the fact that breaking it would be at least as hard as solving syste...

The ESTREAM project has identified two profiles for stream ciphers: a hardware profile and a software profile. The software profile is directly applicable to many computer systems. The hardware profile, on the other hand, does not reflect a complete system design, but instead represents a stand-alone component. In this paper we consider the integration of hardware stream ciphers in software sys...

In this paper, a new stream ciphers design method (named TEP) is proposed to base on the table-element nonlinear permutation. A number of words are generated by n-LFSRs(linear feedback shift register) input to a table. In the table, every word is dealt with by the nonlinear transforms and the several words are combined with nonlinear function to produce keystream words. The algorithm is simplic...

Ronald A. Gove 85.1 Some Basic Definitions....................................................... 1095 85.2 Some Historical Notes........................................................ 1096 85.3 The Basics of Modern Cryptography................................ 1098 85.4 Stream Ciphers.................................................................... 1099 85.5 Block Ciphers .....................

The cube attack is a powerful cryptanalytic technique and is especially powerful against stream ciphers. Since we need to analyze the complicated structure of a stream cipher in the cube attack, the cube attack basically analyzes it by regarding it as a blackbox. Therefore, the cube attack is an experimental attack, and we cannot evaluate the security when the size of cube exceeds an experiment...

Abst rac t . In this paper a number of binary cyclotomic generators based on cyclotomy are described. A number of cryptographic properties of the generators are controlled. A general approach to control the linear complexity and its stability for periodic sequences over any field is shown. Two bridges between number theory and stream ciphers have been" established, and the relations between the...