Network Security

In an RSA cryptosystem, the value of the public modulus parameter n is 3007. If it is also known that $$\varphi $$(n) = 2880, where $$\varphi $$() denotes Euler's Totient Function, then the prime factor of n which is gre...

A sender S sends a message m to receiver R, which is digitally signed by S with its private key. In this scenario, one or more of the following security violations can take place. I. S can launch a birthday attack to rep...

Consider that B wants to send a message m that is digitally signed to A. Let the pair of private and public keys for A and B be denoted by $$K_x^ - $$ and $$K_x^ + $$ for x = A, B, respectively. Let K x (m) represent the...

Anarkali digitally signs a message and sends it to Salim. Verification of the signature by Salim requires

Suppose that everyone in a group of N people wants to communicate secretly with the N - 1 others using symmetric key cryptographic system. The communication between any two persons should not be decodable by the others i...

Which one of the following are used to generate a message digest by the network security protocols? (P) RSA (Q) SHA-1 (R) DES (S) MD5

Using public key cryptography, X adds a digital signature σ to message M, encrypts, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations?

A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT

In the RSA public key cryptosystem, the private and public keys are (e, n) and (d, n) respectively, where n = p$$ \times $$q and p and q are large primes. Besides, n is public and p and q are private. Let M be an integer...

The total number of keys required for a set of n individuals to be able to communicate with each other using secret key and public key crypto-systems, respectively are:

Consider the following two statements: i. A hash function (these are often used for computing digital signatures) is an injective function. ii. encryption technique such as DES performs a permutation on the elements of i...

Consider the following two statements: i. A hash function (these are often used for computing digital signatures) is an injective function. ii. encryption technique such as DES performs a permutation on the elements of i...

Suppose that two parties A and B wish to setup a common secret key (D - H key) between themselves using the Diffie-Hellman key exchange technique. They agree on 7 as the modulus and 3 as the primitive root. Party A choos...

A sender is employing public key Cryptography to send a secret message to a receiver. Which one of the following statement is true?