In a transposition cipher
(a) The ordering of the letters is shifted.
(b) A message is embedded within another message.
(c) Every occurrence of a letter is replaced with another letter.
(d) The key length of a word is changed.
Question 2
Non-repudiation is
(a) Legally proving that a message was sent or received.
(b) Ensuring that the sender and receiver of a message prove their identities to each other.
(c) Ensuring that information transmitted over the Internet has not been captured or passed on to a third part.
(d) Ensuring that information you send or receive has not been compromised or altered.
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Apple Letters