Question

Cyber Security

1. You will first create random keys and initialization vectors that you will use throughout the lab.

For example, to create an 8 byte random number (hex), you can use the command: openssl rand -hex 8

Create a random 8-byte key and 8-byte IV that you will use for DES operations and a random 16-byte key and 16-byte IV that you will use for AES operations.

Answer 1

To create a 8 byte DES key, run the following command :

openssl rand -hex 8

To create a 8 bytes IV for DES operations, execute the following command in Openssl :

$secure = false;
$iv = openssl_random_pseudo_bytes(8, $secure); 
if ($secure) {
    // Success 
} else {
    //Did not Succeed 
}

To create a 16 byte AES key, run the following command :

openssl rand -hex 16

To create a 16 bytes IV for AES operations, execute the following command in Openssl :

$secure = false;
$iv = openssl_random_pseudo_bytes(16, $secure); 
if ($secure) {
    // Success 
} else {
    //Did not Succeed 
}