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I have a file that our customer encrypted using our public key. I know how to decrypt it using our ppk file programmatically, but I am unsure of how to do this from the command line, or using PuTTYGen (which I don't think supports the decryption of files from the utility).

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Why do you have a public key if you don't know how to use it?

The encrypted block probably says in clear text what program/system was used to encrypt it. It's probably the one that generated your public key.

BTW, I believe I've seem phishing email that used this scheme to try to trick you into downloading and running some "decrypting" software.

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I could write a program to decrypt it but i was hoping for a utility that would quickly allow me to decrypt the file for time's sake. –  Alexander Miles Aug 29 '12 at 19:57
    
something doesn't add up here. How is it you have a public key and no clue how to use it as part of an encryption system? –  ddyer Aug 29 '12 at 20:00
    
I've only worked with encryption a few times, I don't know much about the whole process. Basically, I have a ppk file (our private key), and a file that our customer sent us which has been encrypted with our public key. I need to know how to decrypt the file (e.g. what is a good utility to use for this) –  Alexander Miles Aug 29 '12 at 20:10
    
google "pgp" for some likely useful information –  ddyer Aug 29 '12 at 20:13
    
thanks, openpgp is much more acceptable for what we're trying to accomplish –  Alexander Miles Aug 29 '12 at 20:22

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