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12. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.

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12. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.

(a) 88

(b) 122

(c) 143

(d) 111

I have been asked this question in a job interview.

My question is from Overview in portion Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

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Right answer is (a) 88

The best I can explain: n = pq = 11 × 19 = 187.

C=M^e mod n ;  C=11^23 mod 187 ; C = 88 mod 187.

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