PRESENT is a lightweight block cipher with a 64-bit block size and an 80 or 128 bit key.
PRESENT is an "ultra-lightweight block cipher" developed in 2007. It has a 64-bit block size and an 80 or 128 bit key, and internally uses 31 rounds of a substitution-permutation network based on a single 4-bit S-box. It is included (together with CLEFIA) in the ISO/IEC 29192-2:2012 standard for lightweight block ciphers.
- Bogdanov et al., 2007. "PRESENT: An Ultra-Lightweight Block Cipher", in Cryptographic Hardware and Embedded Systems - CHES 2007, Springer, pp. 450-466.