I just read an interesting product announcement: "The RF-5151DE digital encryption option is designed for all RF-5000 FALCOM Series HF-SSB radio systems. The module provides an embedded voice-data encryption system which can be programmed with up to six of 1 X 10^52 key codes. The encryption algorithm is driven by a pseudo-random key generator possessing a key stream length requiring millions of years for recursion. [Harris RF Communications Group, Rochester, NY, (716) 244-5830.] This was in one of those military hardware magazines. Does this sound like a piece of military gear? Is this key length adequate for that? If it were approved for the protection of classified information, which was never mentioned one way or the other, would a detail like the key length be allowed to be disclosed publicly?