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The Index of Coincidence is(a) 0.065(b) 0.048(c) 0.067(d) 0.044I got this question in class test.This interesting question is from Overview topic in portion Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer» RIGHT choice is (d) 0.044

To ELABORATE: NUMBER of letters = 145.From this, IC=0.0438697 .This is very strong evidence thatthe MESSAGE CAME from a polyalphabetic ciphering scheme.


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