@misc{cryptoeprint:2008:514, author = {Tapan Rai and Stanislav Bulygin}, title = {Noncommutative Polly Cracker-type cryptosystems and chosen-ciphertext security}, howpublished = {Cryptology ePrint Archive, Report 2008/514}, year = {2008}, url = {http://eprint.iacr.org/2008/514}, }