Des is a block ciper which uses 56-bit-key for encryption and decryption. suppose the attacker adopts brute-force attacks or exhaustive key search to break the system. in other words, the attacker will try different key so as to find the right key. how many trials the attacker has to do on average to obtain the correct key?

What percentage of companies is projected to use social media to locate new employees in 2012

Asequential circuit contains a register of four flip-flops. initially a binary number n (0000 ≤ n ≤ 1100) is stored in the flip-flops. after a single clock pulse is applied to the circuit, the register should contain n + 0011. in other words, the function of the sequential circuit is to add 3 to the contents of a 4-bit register. design and implement this circuit using j-k flip-flops.

If you're using an existing powerpoint presentation that will receive new slides based on a word outline, select the a. slide that will appear after the new slides. b. first slide in the presentation. c. slide that will appear before the new slides. d. last slide in the presentation.