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QUAD stream cipher uses multivariate polynomial systems. It has provable security based on the computational hardness assumption. More specifically, the security of QUAD depends on hardness of solving non-linear multivariate system us over a finite field, and it is known as an NP-Hard problem. However, QUAD is slower than other stream ciphers, and an efficient implementation, which has a reduced computational...
Hash functions are widely used in secure communication systems for message authentication and data integrity verification. For encryption of data, stream ciphers are preferred to block ciphers because it consumes less power and hardware. In this paper we propose implementation and analysis of a circuit for both Hash generation and Encryption of data, based on a single hardware block in the time shared...
The paper presents a hardware accelerator that could be used to generate irreducible primitive polynomials with coefficients over GF(3). The process of generating a primitive polynomial is done by replicating the other primitive polynomial which is fixed in the device. The implemented algorithm allows the unit to generate all possible primitive polynomials of the same degree as the stored polynomial...
In this work a new algorithm for encryption image is introduced. This algorithm makes it possible to cipher and decipher images by guaranteeing a maximum security. The algorithm introduced is based on stream cipher with nonlinear filtering function. The Boolean function used in this algorithm is resilient function satisfying all the cryptographic criteria necessary carrying out the best possible compromises...
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