The $1997$ IEEE paper "Encryption", which was submitted by Fred Piper in European Conference on Security and Detection, has this statement

Thus anyone sending a message over a public network or storing

it on a database should ask themselves:

$*$ Am I happy for everyone else to know its contents?

If their answer is YES then there may be no problem, but if it

is not then they may need to ask:

$*$ How much am I prepared to pay to stop them?

$*$ Am I allowed to stop them?

For transmitted messages the sender may also ask:

$*$ Do I need acknowledgement of delivery?

Similarly anyone receiving a message over a network will need to ask themselves the following:

$*$ Am I confident to know the identity of the sender$?$

$*$ Am I happy that the message I have received is identical

to the one which the originator sent?

$*$ Am I concerned that the sender may later deny sending

this message and$/$or claim to have sent a different one?