Free EC-COUNCIL 212-81 Exam Dumps Questions & Answers

John is trying to select the appropriate authentication protocol for his company. Which of the following types of authentication solutions use tickets to provide access to various resources from a central location?

• A.  Kerberos
• B.  EAP
• C.  Radius
• D.  CHAP

A disk you rotated to encrypt/decrypt. Created by Leon Alberti. Similar technologies were used in the Enigma machine. Considered the forefather of modern encryption.

• A.  Chi Square
• B.  Scytale Cipher
• C.  Enigma Machine
• D.  Cipher Disks

Which of the following are valid key sizes for AES (choose three)?

• A.  512
• B.  256
• C.  64
• D.  128
• E.  56
• F.  192

Uses a formula, M_n = 2^n − 1 where n is a prime number, to generate primes. Works for 2, 3, 5, 7 but fails on 11 and on many other n values.

• A.  Mersenne Primes
• B.  Co-prime Numbers
• C.  Fibonacci Numbers
• D.  Even Numbers

What does Output feedback (OFB) do:

• A.  The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
• B.  The cipher text from the current round is XORed with the plaintext from the previous round
• C.  The cipher text from the current round is XORed with the plaintext for the next round
• D.  A block cipher is converted into a stream cipher by generating a keystream blocks, which are then XORed with the plaintext blocks to get the ciphertext