sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<Taek>
is it possible to do encryption with a secret key, and then decryption with a public key?
<Taek>
such that, given the public key and the decrypted data, you can't go back to the encrypted data
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<TD-Linux>
Taek, that's basically message signing
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<Taek>
TD-Linux: not quite, unless I'm misunderstanding signing. In message signing you can't go from a signature to the original data can you? You need the original data to verify that the signature is correct
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<fluffypony>
no the signature is more like a hash of the data, it's not encrypted
<TD-Linux>
Taek, well the "message" being encrypted in most digital signatures is the hash of the original message
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<Taek>
my request is specifically that you can decrypt the data using just the public key
<Taek>
digital signatures don't have that power
<fluffypony>
but you said you must be able to decrypt it
<TD-Linux>
Taek, well you decrypt the hash using just the public key. the hash could instead be the whole message
<Taek>
hmm. If I'm understanding correctly, you are saying that digital signature schemes work by encrypting some data with a private key, and verification works by decrypting it with the public key?
<Taek>
(I get the part where you can substitute the hash for the whole message)
<TD-Linux>
Taek, yes
<Taek>
oh. Neat. That's basically what I want then, thanks
<TD-Linux>
at least in the case of RSA
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