Cryptology ePrint Archive: Report 2009/488

Little Dragon Two: An efficient Multivariate Public Key Cryptosystem

Rajesh P Singh and A.Saikia and B.K.Sarma

Abstract: In 1998 [8], Patarin proposed an efficient cryptosystem called Little Dragon which was a variant of Matsumoto Imai cryptosystem C¤. However Patarin later found that Little Dragon cryptosystem is not secure [8], [3]. In this paper we propose a public key cryp- tosystem Little Dragon Two which is as e±cient as Little Dragon cryptosystem but secure against all the known attacks. Like little Dragon cryptosystem the public key of Little Dragon Two is of mixed type that is quadratic in plaintext and ciphertext variables. So the public key size of Little Dragon Two is equal to Little Dragon Cryptosystem. Our Public key algorithm is bijective and can be used for both encryption and signatures.

Category / Keywords: public-key cryptography / Multivariate Cryptography, Dragon Cryptosystems

Publication Info: Submitted

Date: received 4 Oct 2009

Contact author: r pratap at iitg ernet in

Available format(s): PDF | BibTeX Citation

Version: 20091005:121122 (All versions of this report)

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