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Message-Id: <201210270819.05004.raju@linux-delhi.org> Date: Sat, 27 Oct 2012 08:19:04 +0530 From: "Raj Mathur (राज माथुर)" <raju@...ux-delhi.org> To: full-disclosure@...ts.grok.org.uk Subject: Re: stealing ssh keys On Thursday 25 Oct 2012, Ivaylo Hubanov wrote: > Yes Raj, > You almost got the RSA encryption/decryption flow. :) Just the > private key is used to sign the data and not to encrypt it. We're splitting hairs here :) but the private key is actually used to encrypt. That encryption is called a signature. Except, what you encrypt with the private key is a digest of the message, not the whole message itself. When your recipient gets the message with the encrypted digest, she uses the same algorithm to make her own digest of the received message. She then uses your public key to decrypt the encrypted digest you'd sent and compares the two digests. If they're the same, then (a) the message originated from you, and (b) the message was not tampered with during transmission. If they're not the same, then someone is playing silly buggers in the message flow. Regards, -- Raj -- Raj Mathur || raju@...dalaya.org || GPG: http://otheronepercent.blogspot.com || http://kandalaya.org || CC68 It is the mind that moves || http://schizoid.in || D17F _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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