The security is important issue of the field of networking. Security is the initial stage of authentication and the authentication is highly influencing of modern cryptography. The Data encryption standard (DES) algorithm is a symmetric key algorithm for the using of encryption of electronic data and secure of information. The DES algorithm is provided security of brute force attack. To improve the security of DES algorithm using substitution technique is added before the DES algorithm to perform its process. The substitution cipher is the method of encoding by which unit of plaintext are replaced with cipher text. If the substitution technique is used before the original DES algorithm then the intruder required first to break the original DES algorithm and then substitution technique.

Enhancing the Security of Data Using DES Algorithm along with Substitution Technique

http://ijecs.in/issue/v5-i10/30%20ijecs.pdf

Cryptography is the art of achieving security by encoding messages to make them non-readable. Cryptography is the practice and study of hiding information. A message in plain text can be understood by anybody knowing the language as long as the message is not codified in any manner. So, now we have to use coding scheme to ensure that information is hidden from anyone for whom it is not intended, even those who can see the coded data. In modern times cryptography is considered a branch of both mathematics and computer science and is affiliated closely with information theory, computer security and engineering. Cryptography is used in applications present in technologically advanced societies; examples include the security of ATM cards, computer passwords and electronic commerce, which all depend on cryptography. There are two basic types of cryptography: Symmetric Key and Asymmetric Key .In this paper, we provide review of various types of cryptography techniques.

Mamta

Papers

A Review Paper on Data Encryption and Decryption