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I have a file encrypted with GPG suite 2 years ago...

I need it now and tried to decrypt it but the resulting zip file is 0 bytes :((

What does that mean ?

I also tried the CLI and Im getting

gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
gpg: decryption failed: Bad session key

EDIT

If I put --batch the file is decrypted but I cannot find it anywhere

gpg --passphrase "mypassword" -d --batch --ignore-mdc-error myFilePath

gpg: WARNING: message was not integrity protected

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  • Questions: (1) What is your operating system? (2) Is gpg the latest version? (3) Or is gpg the same version as encrypted the file? There have been reports about gpg version 2 having problems decrypting gpg version 1.4.
    – harrymc
    Nov 17, 2018 at 20:01
  • OSX 10.14.1, latest GPG using homebrew, not sure what was my version of the encrypted file; I was using GPG tools at the time 2 years ago
    – jotyhista
    Nov 17, 2018 at 20:40

1 Answer 1

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Try to replace your current homebrew version by GPG 1.4.

One alarming text from the above link:

GnuPG 1.4 is the old, single binary version which still support the unsafe PGP-2 keys.

As the last version 1.4 dates from only 5 months ago, this might explain why your current version doesn't support your keys format, if they are in the PGP-2 format.

(General note: When files are encrypted, one should always take in account the possibility that software changes might make decryption impossible after some years. Encryption is not a long-term solution.)

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  • Thank you for the suggestion I'll try I went to the link but this is not a binary... I am not familiar how to compile.. :s is it possible to install with brew ?
    – jotyhista
    Nov 17, 2018 at 21:03
  • actually I managed to install it and tried to decrypt but no success with the same command as above. gpg (GnuPG) 1.4.23
    – jotyhista
    Nov 17, 2018 at 21:11
  • actually it worked but different command using gpg --decrypt file > file.zip
    – jotyhista
    Nov 17, 2018 at 21:20
  • could I please ask a last advice, now I managed to decrypt; I would like to uninstall the 1,4; how can I do that with files I had to compile myself, brew is saying that v2.21 is already installed so I have a conflict I guess, if I do gpg --version I get 1.4
    – jotyhista
    Nov 17, 2018 at 21:35
  • actually I got it brew link --overwrite gnupg
    – jotyhista
    Nov 17, 2018 at 21:41

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