A Review on Various Data Security Techniques in Wireless Communication System

The data transfer, either through wired media or wireless media, needs privacy or a security. In case of wireless means of communication when the data is in the route, in order to protect the data from going into the hands of an unauthorized person, the two main techniques are used i.e. Steganography and Cryptography. Steganography hides the messages inside other harmless digital media without altering it such that no one can detect the presence of secret message whereas cryptography is the science of writing the secret message and the science of encryption and decryption. Basically Cryptography may be public key cryptography also called asymmetric where different keys are used for encryption and decryption or the private key processes or it may be the private key cryptography also called symmetric which uses the same key for both the encryption and decryption processes. Symmetric cryptographic algorithms operating on single bit at a time are said to be stream ciphers and those operating on data in groups or blocks are said to be symmetric block ciphers. This paper aims at the study of various symmetric block ciphers like Data Encryption Standards (DES), Triple-Data Encryption Standards (T-DES) And Advanced Encryption Standards (AES). Also this paper compares the various encryption and decryption algorithms used in Data Encryption Standards (DES) and Advanced Encryption Standards (AES) which may be implemented in various hardwares like ASICs and FPGA. Field Programmable Gate Arrays are the digital Integrated Circuits which can be reconfigured are widely used to provide the high performance and the low cost application for the purpose of performing cryptographic applications.