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| The Constraint Conditions for LDPC Codes in Cryptosystem |
| Lin Xue-hong; Niu Kai; Lin Jia-ru |
| School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract This paper first presents Belief Propagation (BP) iteration algorithm in LDPC code-based public-key cryptosystems, and develops the necessary condition of private key if the probability of plaintext is equal. Then the necessary and sufficient condition of public key is deduced according to the recursion of BP iteration algorithm. Simulations show that the parameters of private key and public key are correct.
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Received: 09 February 2009
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Corresponding Authors:
Lin Xue-hong
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2010, Vol. 32 
