Title: Efficient key management FPGA-based cryptosystem using the RNS and iterative coding

Authors: N. Ntomambang Ningo, M. Ekonde Sone

Addresses: ACL, ENSP, University of Yaounde 1, P.O. Box 8370, Yaounde, Cameroon. ' Faculty of Science, University of Buea, P.O. Box 63, Buea, Cameroon

Abstract: The paper reports the development of a new cryptosystem with a multilevel structure for encryption and decryption. At the first level, RNS-based implementation of a public-key RSA signature converts the original plaintext into a ciphertext. Iterated wavelet-based subband coding splits the ciphertext into different levels of decomposition. At subsequent levels of decomposition, the ciphertext from the preceding level serves as plaintext for encryption using convolutional codes. Attack is difficult since the cryptographic complexity is propagated from one level of decomposition to another. By using the RNS, there is efficient key management since long secret keys are replaced by short parallel keys which depend on the residue set. Moduli set {111, 115, 119} is used to implement a multilevel non-linear (8, 8, 2) two-cascaded model on a Virtex-4 FPGA. To our knowledge, this is the first proposal of a hardware implementation of a cryptosystem using lossless compression and convolutional codes.

Keywords: key management; subband coding; SBC; convolutional codes; ciphertext; moduli set; field-programmable gate arrays; FPGA; residue number system; RNS; very-high-speed hardware description language; VHDL; public-key RSA cryptosystem; cryptography; iterative coding; security.

DOI: 10.1504/IJICT.2010.034973

International Journal of Information and Communication Technology, 2010 Vol.2 No.4, pp.302 - 322

Published online: 31 Aug 2010 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article