@misc{cryptoeprint:2006:071, author = {Ueli Maurer and Johan Sjödin}, title = {A Fast and Key-Efficient Reduction of Chosen- Ciphertext to Known-Plaintext Security}, howpublished = {Cryptology ePrint Archive, Report 2006/071}, year = {2006}, url = {http://eprint.iacr.org/2006/071}, }