Chosen-Ciphertext Attacks on Optimized NTRU
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NTRU([3]) is an efficient public-key cryptosystem proposed by Hoffstein, Pipher, and Silverman. In [4], some modifications were made to the original scheme to make the system even faster. We give three chosenciphertext attacks on the un-padded version of this optimized NTRU cryptosystem. Any one of the three attacks will recover the private key with just a few queries to the decryption machine.
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[2] Joseph H. Silverman,et al. Optimizations for NTRU , 2001 .
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[4] Joseph H. Silverman,et al. NTRU: A Ring-Based Public Key Cryptosystem , 1998, ANTS.