In the RSA public key cryptosystem, the private and public keys are (e, n) and (d, n) respectively, where n = p*q and p and q are large primes. Besides, n is public and p and q are private. Let M be an integer such that 0 < M < n and (n) = (p 1) (q 1). Now consider the following equations. 1. M = Me mod n M = (M )d mod n 2. ed 1 mod n 3. ed = 1 mod n 4. M = Me mod n M = (M )d mod n Which of the above equations correctly represent RSA cryptosystem?

In the RSA public key cryptosystem, the private and public keys are (e

1.	In the RSA public key cryptosystem, the private and public keys are (e, n) and (d, n) respectively, where n = p*q and p and q are large primes. Besides, n is public and p and q are private. Let M be an integer such that 0 < M < n and (n) = (p 1) (q 1). Now consider the following equations. 1. M = M^e mod n M = (M )^d mod n 2. ed 1 mod n 3. ed = 1 mod n 4. M = M^e mod n M = (M )^d mod n Which of the above equations correctly represent RSA cryptosystem?
A.	1 and 2
B.	1 and 3
C.	2 and 4
D.	3 and 4
Answer» C. 2 and 4

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