No need for a private key registry because verifying the public key is sufficient. There are public key registries but I doubt they validate duplication. Remember this is PGP (Pretty Good Privacy - not perfect), so there are multiple factors that were considered. In this case, duplicate key pairs are a very minor exposure because it's unlikely those few matching private key holders will abuse your key. Jon.
On Saturday, August 24, 2019, 10:30:19 AM PDT, Paul Gilmartin <0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote: On Sat, 24 Aug 2019 11:16:57 -0500, Mike Schwab wrote: >>Well, keys are supposed to be two large prime numbers. Without a >>registry of which numbers have been used, it would be possible for two >>people to use the same prime number. >Such a registry would defeat the purpose, although a registry of public >keys is plausible. Cryptosystems depend on the extreme unlikeliness of a >collision. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN