Key recovery attacks on NTRU without ciphertext validation routine
NTRU is an efficient public-key cryptosystem proposed by Hoffstein, Pipher, and Silverman. Assuming access to a decryption oracle, we show ways to recover the private key of NTRU systems that do not include a ciphertext validating procedure. The strongest of our methods will employ just a single call to the oracle, and in all cases, the number of calls needed will be small enough to be realistic.
IMPROVED PUBLIC KEY CRYPTOSYSTEM USING FINITE NON ABELIAN GROUPS
In the public key cryptosystem using finite non abelian groups which is suggested in CRYPTO 2001, the discrete logarithm problems in inner automorphism groups are used. In this paper, we generalize the system and give some examples of non abelian groups which is applicable to our system.