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I'm setting up a system to update software on a device and I would like to encrypt the update files using a private key that I have created and then decrypt them with the public key. All of the examples that I have found encrypt with the recipients public key, I want to encrypt with my private key. I have seen Bob & Alice examples that use encryption of a file with your private key and then with the recipients public key, but I can't figure out how to do the private key encryption.

  • Do you want to be the only one to be able to decrypt the files ? – Vinz Nov 3 '15 at 19:27
  • Maybe this will help you : crypto.stackexchange.com/questions/2123/… – Vinz Nov 3 '15 at 19:37
  • In my scenario I don't really care if anyone can decrypt the file, although the public key will only be distributed to the systems that need it. What I care about is that I am the only one that can encrypt the file that contains the code updates. I suppose that I can just reverse the definitions in my case, and never disclose the 'public' key and put the 'private' key on the systems to be updated. – GWLindberg Nov 4 '15 at 21:36
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This is not the way GPG works.

You encrypt a file with a public key (may be yours), and decrypt it with a private key.

So if you share your public key on the Internet, anyone would be able to encrypt a file with your public key, but you would be the only one able to decrypt it.

See : http://www.dewinter.com/gnupg_howto/english/GPGMiniHowto-1.html

  • I suppose that the function that I'm using the encryption for could be done with signing where the file and the sign are concatenated to one file, as I don't care it anyone sees what the data is, just that it can be verified that I'm the one that generated it. – GWLindberg Nov 4 '15 at 21:40

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