The fundamental principles for security evaluation in block cipher algorithms

Cryptography is the mathematics of secret codes. Symmetric-key block ciphers are the most fundamental elements in many cryptographic systems. They provide confidentiality which is usedin a large variety of applications such as protection of the secrecy of login passwords, e-mailmessages, video transmissions and many other applications. This paper includes both general concepts and details of specific cipher algorithms. It consists of the newest fundamental principles for designing and evaluating in block cipher algorithms