Free Certified Encryption Specialist Exam 212-81 Exam Practice Test

Cylinder tool. Wrap leather around to decode. The diameter is the key. Used in 7th century BC by greek poet Archilochus.

• Cipher disk
• Caesar cipher
• Scytale
• Enigma machine

Numbers that have no factors in common with another.

• Fibonacci Numbers
• Even Numbers
• Co-prime numbers
• Mersenne Primes

This hash function uses 512-bit blocks and implements preset constants that change after each repetition. Each block is hashed into a 256-bit block through four branches that divides each 512 block into sixteen 32-bit words that are further encrypted and rearranged.

• SHA-256
• FORK-256
• SHA-1
• RSA

The art and science of writing hidden messages so that no one suspects the existence of the message, a type of security through obscurity. Message can be hidden in picture or audio file for example. Uses least significant bits in a file to store data.

• Steganography
• Cryptosystem
• Avalanche effect
• Key Schedule

Juanita is attempting to hide some text into a jpeg file. Hiding messages inside another medium is referred to as which one of the following?

• Cryptography
• Steganalysis
• Cryptology
• Steganography

The time and effort required to break a security measure.

• Session Key
• Work factor
• Non-repudiation
• Payload

Which of the following is generally true about key sizes?

• Larger key sizes increase security
• Key size is irrelevant to security
• Key sizes must be more than 256 bits to be secure
• Smaller key sizes increase security

Fred is using an operating system that stores all passwords as an MD5 hash. What size is an MD5 message digest (hash)?

• 160
• 512
• 256
• 128

This algorithm was published by the German engineering firm Seimans in 1993. It is a software based stream cipher using Lagged Fibonacci generator along with a concept borrowed from the shrinking generator ciphers.

• RC4
• Blowfish
• Twofish
• FISH

You are explaining basic mathematics to beginning cryptography students. You are covering the basic math used in RS

• Odd numbers with no divisors
• Odd numbers
• Any number only divisible by odd numbers
• Any number only divisible by one and itself