PRIVATE-KEY ENCRYPTION BASED ON CONCATENATION OF CODES

Public-key algebraic encryption (PUAE) has certain advantages that mak e it attractive in some applications. Variants of PUAE for private-key algebraic encryption (PRAE) have been proposed subsequently. PRAE is proven to be insecure under chosen plaintext attack. In the paper, som e invariants of PRAE are studied, and a private-key cryptosystem based on concatenation of codes is proposed and analysed. The new system is composed of short-length codes and is designed to avoid the weaknesse s in other PRAE systems. The system looks secure against known attacks . Some methods to improve the system information rate and security are also suggested.