"

You know, I'm leaning more and more towards Roger's opinion here: knowing what we know about the sources, I think it's implied that IBM re-invented DC, but it's not unambiguous, and it's really not such a critical point to this article.  I think we should just say that IBM was aware of differential cryptanalysis but didn't publish it, at least in this article: the proper place to get into this in detail would be in the Data Encryption Standard article or the differential cryptanalysis article.  juicetalk "