From: Dave Aronson Date: 2012-10-28T04:46:31+09:00 Subject: Re: OpenSSL ECDSA public key from private Nokan Emiro wrote: > Could anybody please tell me how can I generate a public key from > a private one with OpenSSL (or any other lib/gem) in Ruby? I haven't looked into how to do this in Ruby, but at least with the command-line stuff from OpenSSL it seems to be trivial. (That's quite contrary to my initial assumptions. I was all set to tell you "no, the whole point is that you can't derive one from the other", and was fact-checking. Apparently asymmetrical crypto is even more asymmetrical than I thought!) Check out the answers to this question on SO: http://stackoverflow.com/questions/696472/given-a-private-key-is-it-possible-to-derive-its-public-key -Dave -- Dave Aronson, the T. Rex of Codosaurus LLC, secret-cleared freelance software developer taking contracts in or near NoVa or remote. See information at http://www.Codosaur.us/.