Kizspy.me
algorithm yields d = 29. What is the ciphertext C when encrypting M = 53?
Q8 (1 point). Using the same notations as in the lecture, e.g., p and q are the two
primes and e and d are the public key and the private key, respectively, p =5, q = 13
and e=5. The attacker performs a chosen-ciphertext attack (CCA). It has a known
ciphertext 19 and wants to retrieve the corresponding plaintext. It computes c' = c*r^e
mod n and chooses the ciphertext 19*243 mod 65 = 2 and retrieves the corresponding
plaintext 32. What is the plaintext corresponding to the ciphertext 19?
Q9 (1 point). Alice and Bob uses Diffie-Hellman Key Exchange to share a key with a
common prime p = 29 and a primitive root a = 2. If Alice has a public key Y_A =7, what
is her private key X_A?
Q10 (1 point). There are 5 computers (hardware). Each computer hosts 5 virtual
machines (VM) with different addresses, and each VM hosts 10 applications. How many
key exchange sessions (in one session, two logical parties share a key) are needed if
the decentralized key distribution is used so that all VM's share a pair-wise keys?
Zoom
+ 100%
Close
