The article was delisted by DrKay via FACBot ( talk) 8:09, 14 August 2018 (UTC) [1].
The article fails 1(c) due to the use of references like Usenet group comments, blogs and raw code. Parts of the article (in Variants, Implementation) are completely unsourced. There are also 1(b) concerns: if we remove the unreliable sources and their associated content, the article will be too short to meet the "comprehensive" criterion. Specifically, I think the article lacks formal pseudocode, implementation details (e.g. function in ASCII) and cryptographic details (e.g. substitution cipher not mentioned in body, or explained), and there may be other content that is missing.
The FAC was in 2004, when standards were completely different—the article looked like this. The FAR in 2007 also held the article to vastly different standards to those we use in 2018. So the article has never passed through an FA-related process under the rigorous standards of today. — Bilorv (c) (talk) 01:18, 10 August 2018 (UTC) reply