What I can offer in regard to K4 is this: The BERLINCLOCK section directly relates back to the first 11 letters of K1. When you repeat those 11 letters, the alignment against K4 at the NYPVTTMZFPK section is RFAEMUFPHZL. Using a keyed Vigeneire table with the Kryptos alphabet, and nothing else, you get the following letter sequences decoded – CWBYAHUQNBL, MIZCEALCULK, ELYOIECBAQK and of course BERLINCLOCK.
↧