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Why is PGP 5.x not able to encrypt messages with some keys?

April 26, 2017able encrypt keys Messages PGP

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Why is PGP 5.x not able to encrypt messages with some keys?

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PGP, Inc. refuses to accept ElGamal keys of type 20 even for encryption. They only support type 16 (which is identical at least for decryption). To be more inter-operable, GnuPG (starting with version 0.3.3) now also uses type 16 for the ElGamal subkey which is created if the default key algorithm is chosen. You may add a type 16 ElGamal key to your public key, which is easy as your key signatures are still valid.