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

You are trying to find a modern method for security web traffic for use in your company's ecommerce web site. Which one of the following is used to encrypt web pages and uses bilateral authentication?

• A.  AES
• B.  SSL
• C.  3DES
• D.  TLS

All of the following are key exchange protocols except for____

• A.  DH
• B.  AES
• C.  MQV
• D.  ECDH

What is the basis for the FISH algorithm?

• A.  Prime number theory
• B.  The Lagged Fibonacci generator
• C.  Equations that describe an ellipse
• D.  The difficulty in factoring numbers

A technique used to increase the security of block ciphers. It consists of steps that combine the data with portions of the key (most commonly using a simple XOR) before the first round and after the last round of encryption.

• A.  Key Clustering
• B.  Key Exchange
• C.  Key Schedule
• D.  Whitening

What does Output feedback (OFB) do:

• A.  The cipher text from the current round is XORed with the plaintext from the previous round
• B.  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
• C.  The cipher text from the current round is XORed with the plaintext for the next round
• D.  The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption