cryptography Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or ''-logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adver ...

, DECIM is a stream cypher

algorithm In mathematics and computer science, an algorithm () is a finite sequence of rigorous instructions, typically used to solve a class of specific problems or to perform a computation. Algorithms are used as specifications for performing ...

Anne Canteaut Anne Canteaut is a French researcher in cryptography, working at the French Institute for Research in Computer Science and Automation (INRIA) in Paris. She studies the design and cryptanalysis of symmetric-key algorithms and S-boxes. Educatio ...

Nicolas Courtois Nicolas Tadeusz Courtois (born 14 November 1971) is a cryptographer and senior lecturer in computer science at University College London. Courtois was one of the co-authors of both the XSL attack against block ciphers, such as the Advanced Encry ...

, Blandine Debraize, Henri Gilbert, Louis Goubin, Aline Gouget, Louis Granboulan, Cédric Lauradoux, Marine Minier, Thomas Pornin and Hervé Sibert. DECIM algorithm was partly

patent A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an enabling disclosure of the invention."A ...

ed but its authors wished for it to remain freely available. It has been submitted to the

eSTREAM eSTREAM is a project to "identify new stream ciphers suitable for widespread adoption", organised by the EU ECRYPT network. It was set up as a result of the failure of all six stream ciphers submitted to the NESSIE project. The call for primi ...

Project of the

eCRYPT ECRYPT (European Network of Excellence in Cryptology) was a 4-year European research initiative launched on 1 February 2004 with the stated objective of promoting the collaboration of European researchers in information security, and especially in ...

network.

History

DECIM was announced in 2005. In 2006 two flaws were identified which could leave the encypted

ciphertext In cryptography, ciphertext or cyphertext is the result of encryption performed on plaintext using an algorithm, called a cipher. Ciphertext is also known as encrypted or encoded information because it contains a form of the original plaintext ...

vulnerable to attack. A revised version of cipher, DECIM v2, as well as a 128-bit security version were developed, both proving vulnerable to attack.

References

Footnotes

Sources

* * * * Stream ciphers {{crypto-stub