On improving security of GPT cryptosystems

Details On improving security of GPT cryptosystems On improving security of GPT cryptosystems

2010-06-05

arxiv.org/abs/1006.1057v1

Computer Science

Cryptography and Security

5 pages. submitted ISIT 2009.Processed on IEEE ISIT2010

Scientific paper

The public key cryptosystem based on rank error correcting codes (the GPT cryptosystem) was proposed in 1991. Use of rank codes in cryptographic applications is advantageous since it is practically impossible to utilize combinatoric decoding. This enabled using public keys of a smaller size. Several attacks against this system were published, including Gibson's attacks and more recently Overbeck's attacks. A few modifications were proposed withstanding Gibson's attack but at least one of them was broken by the stronger attacks by Overbeck. A tool to prevent Overbeck's attack is presented in [12]. In this paper, we apply this approach to other variants of the GPT cryptosystem.

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