Fired for each recipient key of the encrypted message.
KeyId is the Id of the key used to encrypt the message. If a subkey was used to encrypt the message this
will be the Id of that subkey. It is the hex-encoded, 4- or 8-byte Id of the key. It is the same as the last 4 or 8 bytes of the fingerprint.
BF52A0ABThis can be used to identify the correct key to specify in Keys. Keys can be set from within this event as this event fires directly before the decryption process begins.