Technical University of Denmark in 2007. The block size is 64 bits and the key size can be 80 bit or 128 bit. The non-linear layer is based on a single 4-bit S-box present for boyfriend for valentines was designed with hardware optimizations in mind.

PRESENT is intended to be used in situations where low-power consumption and high chip efficiency is desired. A truncated differential attack on 26 out of 31 rounds of PRESENT was suggested in 2014. Several full-round attacks using biclique cryptanalysis have been introduced on PRESENT. By design all block ciphers with a block size of 64 bit can have problems with block collisions if they are used with large amounts of data. Therefore, implementations need to make sure that the amount of data encrypted with the same key is limited and rekeying is properly implemented.