Abstract—Over the Internet, various communications such as electronic mail or Web browsers are not secure for sending and receiving sensitive data. This made cryptographic methods to be known and used even by common-man in communication. Cryptography concerns the ways, in which communications and data can be encoded to prevent disclosure of their contents through eavesdropping using channel codes, ciphers and other methods. The public key system eliminates the key distribution process that hampers all private key systems since there no need to communicate with secret keys among communicating parties. However, a problem that arises with this system is lack of assurance of the true identity of the required party and, associated complexity in operations is too large to be used in resource constrained devices. Hence in this work, methods to introduce security in channel coding without any additional complexity in operations and use of it together with symmetric key encryption systems are attempted. The channel coding method used in this work is Low Density Parity Check (LDPC) codes. Through insertion of security in channel codes it is possible to verify the error correction capability of LDPC codes and to quantify the increase in security of the overall communication system.

Index Terms—Keywords: Public key system, Stream ciphers, Construction of LDPC codes, Encoding and decoding methods of LDPC codes

Cite: B Yamini Pushpa and L Ashok, "EMBEDDING SECRECY IN CHANNEL CODING USING LDPC CODES," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 3, No. 4, pp. 35-43, October 2014.