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encryption/decryption with multiple keys

Is it possible to encrypt data, such that it can be decrypted with several different keys?

Example:

I've encrypted data with key1, but I want to be able to decrypt with keys 2, 3, and 4.

Is this possible?

Solution

  • GnuPG does multi-key encryption in standard.

    The following command will encrypt doc.txt using the public key for Alice and the public key for Bob. Alice can decrypt using her private key. Bob can also decrypt using his private key.

    gpg --encrypt --recipient alice@example.com \
    --recipient bob@example.com doc.txt

    This feature is detailed in the user guide section entitled "Encrypting and decrypting documents"