Delete key after Encipher of a message and wipe PlainText

[sa6mwa]

The proper OTP-way is to delete and wipe a key after enciphering a message (DeleteKey will do both) instead of marking the key as Used and storing the key. Perhaps with a warning to dump the key (-o) and distribute it to the receiver(s)... or not, this should have already been done before sending messages to the receiver.