Correct. The NSA suggested changes in the DES S-boxes, which led to many questions. Ultimately, what was discovered is that their changes strengthened DES, not

Correct. The NSA suggested changes in the DES S-boxes, which led to many questions. Ultimately, what was discovered is that their changes strengthened DES, not weakened it, as some had feared. You can read more about their involvement here: http://crypto.stackexchange.com/questions/16/how-were-the-des-s-box-values-determined http://crypto.stackexchange.com/questions/16/how-were-the-de...