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Old 2022-01-12, 16:33   #7
chris2be8
 
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Sep 2009

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I assume you know the 512 bit public key used to encrypt the data. To decrypt it you need the private key, which is the factors of (part of) the public key. That is a few days work on your PC.

If you don't know the public key but do know the plain text and the cypher text it was encrypted into then finding the key used to encrypt is will be another matter. You should start by reading up on how the software used to encrypt it works. It may have stored the public key in the enrypted file, which is the easy case. If not check where ever the encrypted file came from to see if the key is somewhere you can find. If not then re-read how the software works for clues how to recover the key.
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