International Journal of Computer Science Issues
Cryptography has specific role to protect secret file from unauthorized access. Cryptography algorithms are classified in to two types. Symmetric-key producing and Public-key producing algorithms. In this paper, the authors suggested a new cryptography algorithm to increase security in the Symmetric-key producing algorithm. The main features of cryptography algorithm defined in this paper are changing the physical structure of the secret file, no limitation for the number of keys. The ability to encrypt the secret file in successive stages; creating five keys at each stage of cryptography, storing a part of secret file at one of the keys at each stage of cryptography, interdependence of all keys in all stages of encrypting and decrypting.