Data authentication and confidentiality are two of the most important goals of cryptography, and, for most systems, are jointly required to provide security. Authenticated Encryption (AE) schemes aim at providing these two properties in one primitive, limiting overhead and facilitating secure implementation.
In January 2013, the international competition CAESAR was officially launched. Its goal is to choose a portfolio of new authenticated encryption algorithms that would be recommended for industrial use. This competition can be compared to previous similar ones organized by the US National Institute of Standards and Technology (NIST) or European Network of Excellence ECRYPT, in order to select cryptographic standards. During these selection processes, numerous results were published and new attack strategies were introduced which resulted in new and improved designs. As a result, both competitions had a great impact not only on the design methodologies, but also on the improvement of cryptanalysis.
57 algorithms were submitted to the CAESAR competition, among which SCREAM, and its variant iSCREAM, that were jointly designed by UCL and Inria. In July 2015, the CAESAR committee announced the list of 30 algorithms retained for the second evaluation phase. SCREAM is among the nominees.
The next step will take place in 2016 when the candidates are further shortlisted for the third evaluation phase. The final decision is expected by end 2017.