Multiple signature encryption with GnuPG

user105841

12/27/23, 1:09 PM

I'm aware that GnuPG encrypts for multiple recipients, but is there any way to build a multisig, say, 2 of 5 signatures with GPG?

So having a file encrypted for the following recipients needs at least two of the five to decrypt it:

gpg --encrypt \
  --recipient [email protected] \
  --recipient [email protected] \
  --recipient [email protected] \
  --recipient [email protected] \
  --recipient [email protected] \
clear-message.txt

117

0 + 2

Morrolan

12/29/23, 11:58 AM

Terminology nitpick: A multisignature is about requiring a certain number of parties to **sign** a message. When talking about a system where multiple parties are required to **decrypt** a ciphertext, one would usually call it a 'threshold cryptosystem'. I don't think GPG supports this natively, but might be mistaken.

Pavel Niedoba

5/20/24, 1:36 PM

I would love to have that, maybe having shamir on top of private key would do the job https://en.wikipedia.org/wiki/Shamir%27s_secret_sharing

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Multiple signature encryption with GnuPG

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