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I started a backup via duplicity without giving it any options. I haven't created any GPG keys myself, so when I ran duplicity, it asked me for a passphrase, then created a key, and successfully backed-up (to BackBlaze B2) with encryption and compression.

Good, but I don't know where the key is stored. Thus if my drive dies then I won't be able to restore the backup. gpg -k gives no output. Where's the key hiding?

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If your (secret) key does exist then it is in the secret keyring of the user used to create the key. That user's keyrings are in a directory named '.gnupg' which is in that user's home directory.

So the secret key would be here for the user that created it:

~/.gnupg/secring.gpg

However, based on what you wrote, chances are duplicity just used a symmetric key which only consists of the passphrase you entered.

Reference : https://linux.die.net/man/1/gpg

  • Haha! I was thinking that GPG was symmetric. (I'm really unfamiliar with crypto ^^;) OK, so in other words, duplicity probably encrypted via a deterministic cipher whose sole argument/secret was the passphrase that I gave, and it doesn't use keys nor entropy at all? – 0xnick1chandoke Apr 5 at 19:44
  • Forgot to mention: my ~/.gnupg directory does not contain a secring.gpg file. – 0xnick1chandoke Apr 5 at 19:51
  • This may shed some light concerning using Duplicity with a symmetric key: serverfault.com/questions/173767/… – Jack.L Apr 6 at 21:59
  • thanks. That article confirms my hypothesis: "[if you're not using --encrypt-key, then] you're using symmetric encryption and the secret key consists of your passphrase exclusively." – 0xnick1chandoke Apr 6 at 22:04

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