FPGA implementations of the ICEBERG block cipher

This paper presents field programmable gate array (FPGA) implementations of ICEBERG, a block cipher designed for reconfigurable hardware implementations and presented at FSE 2004. All its components are involutional and allow very efficient combinations of encryption/decryption. The implementations proposed also allow changing the key and encrypt/decrypt (E/D)(E/D) mode for every plain text, without any performance loss. In comparison with other recent block ciphers, the implementation results of ICEBERG show a significant improvement of hardware efficiency. Moreover, the key and E/DE/D agility allow considering new encryption modes to counteract certain side-channel attacks.