Sarvar Patel Zulfikar Ramzan Ganapathy S. Sundaram Efficient Constructions of Variable-Input-Length Block Ciphers. 326-340 https://doi.org/10.1007/978-3-540-30564-4_23 2004 conf/sacrypt/2004 Selected Areas in Cryptography db/conf/sacrypt/sacrypt2004.html#PatelRS04