Question: (a) What three protections do cryptographic systems provide on a message-by-message basis? (b) What is an electronic signature? (c) What two protections do electronic signatures

(a) What three protections do cryptographic systems provide on a message-by-message basis?
(b) What is an electronic signature?
(c) What two protections do electronic signatures usually provide?
(d) Distinguish between the handshaking stages and ongoing communication.

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