Question
Question 2 Which from the following is describe Output Feedback mode OFB, where is P j and P j-1 are plaintext and previous plaintext, and
Question 2
Which from the following is describe Output Feedback mode OFB, where is Pj and Pj-1 are plaintext and previous plaintext, and Cj and Cj-1 ciphertext and previous cipher text, K is a key and E encryption function
a | Cj = E(K, [Cj-1 XOR Pj]) | |
b | Cj = E(K, Pj) | |
c | Cj = Pj_ E(K, [Cj-1 XOR Pj-1]) | |
d | None of above |
Public key encryption, assume that the A encrypts a Text uses private key and send to B, which one from the following described the process of encryption
a | Even if B knows who sent the text it cannot be decrypted | |
b | It cannot be decrypted at all as no one knows Private key of A | |
c | A should send his public key with text | |
d | B knows its from A and it could decrypt using A public key |
How many bits are in a block of the SHA algorithm?
a | 128 | |
b | 2048 | |
c | 512 | |
d | 56 |
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