Online Access Free 212-81 Exam Questions

Bruce Schneier is a well-known and highly respected cryptographer. He has developed several pseudo random number generators as well as worked on teams developing symmetric ciphers. Which one of the following is a symmetric block cipher designed in 1993 by Bruce Schneier team that is unpatented?

• A.Pegasus
• B.Blowfish
• C.SHA1
• D.AES

Electromechanical rotor-based cipher used in World War II

• A.ROT13 Cipher
• B.Rail Fence Cipher
• C.Enigma Machine
• D.Cipher Disk

What is the solution to the equation 8 mod 3?

• A.4
• B.3
• C.2
• D.1

You are studying classic ciphers. You have been examining the difference between single substitution and multi-substitution. Which one of the following is an example of a multi-alphabet cipher?

• A.Caesar
• B.Rot13
• C.Vigenère
• D.Atbash

What is a variation of DES that uses a technique called Key Whitening?

• A.3DES
• B.Blowfish
• C.DESX
• D.AES