When you use public key algorithms: You encrypt with the recipient's public key and the recipient decrypts with their private key.
You sign with your private key and the recipient verifies with your public key. owner-openssl-us...@openssl.org wrote on 12/28/2011 01:43:17 PM: > From: Ireneusz Szcześniak <irek.szczesn...@gmail.com> > To: openssl-users@openssl.org, > Date: 12/28/2011 01:45 PM > Subject: Re: decrypt with a public key > Sent by: owner-openssl-us...@openssl.org > > Thank you, Steve, for your post. Let me explain what I'm trying to > do. In the public key cryptography: > > message = Dprv(Epub(message)) = Dpub(Eprv(message) > > D stands for decrypt, E for encrypt > prv - private key, pub - private key > > And so I tried to do this with the openssl command. > > On 28.12.2011 18:28, Dr. Stephen Henson wrote: > > On Wed, Dec 28, 2011, Ireneusz Szcze??niak wrote: > > > >> Hi, > >> > >> In public key cryptography, a message encrypted with a private key > >> can be decrypted with a public key, and so I tried: > >> > >> openssl rsautl -encrypt -inkey private-key -in message -out cryptogram > >> > >> openssl rsautl -decrypt -inkey public-key -pubin -in cryptogram > >> > >> The problem is that the second command gives me: > >> > >> A private key is needed for this operation > >> > >> Why can't one decrypt with a public key? > >> > >> I do realize that I can convince the recipient of the message that > >> the message is indeed mine by signing the message. > >> > >> > > > > Try the -sign and -verify options instead. > > > > Steve. > > -- > > Dr Stephen N. Henson. OpenSSL project core developer. > > Commercial tech support now available see: http://www.openssl.org > > ______________________________________________________________________ > > OpenSSL Project http://www.openssl.org > > User Support Mailing List openssl-users@openssl.org > > Automated List Manager majord...@openssl.org > > > > > -- > Ireneusz (Irek) Szczesniak > http://www.irkos.org > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org >
