This paper proposes an efficient joint secret key encryption-channel coding cryptosystem, based on regular Extended Difference Family Quasi-Cyclic Low-Density Parity-Check codes. The key length of the proposed cryptosystem decreases up to 85 percent using a new efficient compression algorithm. Cryptanalytic methods show that the improved cryptosystem has a significant security advantage over Ra...

This paper proposes a new modified variant of Menezes and Vanstone elliptic curve cryptosystem. This new variant uses the same original Menezes and Vanstone elliptic curve cryptosystem but in an elegant way. The new variant uses a not only one elliptic curve but a number of curves. Each curve is chosen with its corresponding keys to constitute a separate cryptosystem. The message is then divide...

Images with sensitive content require encryption for storage and transmission. Symmetric schemes can cipher them, while an asymmetric cryptosystem distribute the secret key safely. For this reason, we propose a dynamic hybrid cryptosystem, which ciphers images transfers its private keys. It has symmetric algorithm that applies Lorenz equations generating different boxes permutations in every pr...

This article exploits the fact that linear codes can correct twice the number of erasures as that of errors, allowing reduction in code size and providing the same level of security. decryption or both. The large code size of McEliece