Iraqi block cipher

Iraqi block cipher

In cryptography, the Iraqi block cipher was a block cipher published in C source code form by anonymous FTP upload around July 1999, and widely distributed on Usenet. It is a five round unbalanced Feistel cipher operating on a 256 bit block with a 160 bit key.

A comment suggests that it is of Iraqi origin. However, like the S-1 block cipher, it is generally regarded as a hoax, although of lesser quality than S-1. Although the comment suggests that it is Iraqi in origin, all comments, variable and function names and printed strings are in English rather than Arabic; the code is fairly inefficient (including some pointless operations), and the cipher's security may be flawed (no proof).

Because it has a constant key schedule the cipher is vulnerable to a slide attack. However, it may take 264 chosen texts to create a single slid pair, then the attack is unfeasible. It also has a large number of fixed points, but it's notnecessarily a problem, except possibly for hashing modes. No public attack is currently available. As with S-1, it was David Wagner who first spotted the security flaws. [cite newsgroup |title=Re: Question about iraqi block cipher |author=David A. Wagner |date=2000-05-08 |newsgroup=sci.crypt |id=8f75u3$jvl$1@blowfish.isaac.cs.berkeley.edu |url=http://groups.google.com/group/sci.crypt/msg/fd2f199b8514b8e5?dmode=source |accessdate=2008-08-20]

References

External links

* [http://www.mirrors.wiretapped.net/security/cryptography/algorithms/ibc/ibc.c Source code for the cipher]


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