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After the key exists, technical listings may show the encryption subkey as [E] , Encryption , or an ECDH/cv25519 subkey. During key creation, Kleopatra usually shows it as + ECDH cv25519 , not as [E] . Does not work: signing-only keys, certifying-only keys, expired/revoked keys, private keys, PGP messages, PGP signatures, partial/truncated public keys, or two public key blocks pasted together.