Question: 4 A. Authentication and nonrepudiation are two key goals in cryptosystems. In reference to these two concepts, discuss how cryptographic analysis could be used to

4 A. Authentication and nonrepudiation are two key goals in cryptosystems.

4 A. Authentication and nonrepudiation are two key goals in cryptosystems. In reference to these two concepts, discuss how cryptographic analysis could be used to ensure authentication and nonrepudiation - 10 Marks B. The following encryption was performed using ROT3 Caesar Cypher (e. cp-3 mod 26). "WKH FRPSOHALWB PL WKH ZRUOG GZDUI KYPDQ XQGHUVWDQGLQJ" Decrypt the message to its plain texts - 15 Marks

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