In a public key system, the cipher text received is C = 10 if RSA encryption used with a public key(e = 11, n = 77) to deduce the plain text. Determine the value of ϕ(n)?

In a public key system, the cipher text received is C = 10 if RSA encr

1.	In a public key system, the cipher text received is C = 10 if RSA encryption used with a public key(e = 11, n = 77) to deduce the plain text. Determine the value of ϕ(n)?
A.	49
B.	60
C.	123
D.	70
Answer» C. 123