The rapid development of global networks and the tremendous possibilities offered by electronic transactions in continuous communication today pose a critical challenge to the protection of information against transmission errors in a network. On the other hand, this data must be unintelligible except to the intended audience. In order to overcome these two constraints, the coding of information is used to combat transmission errors and data encryption is often used to combat any spy system. In this paper, we try to introduce a crypto public key system using error correcting codes (it's a two-in-one system). The system studied is the McEliece crypto system using the Hamming cycle code correcting a simple error.

Keywords : Mceliece Crypto System, Hamming Code, Cryptography, Encryption, Public Key.