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212-81 Practice Questions

Question # 1
What best describes the shifting of each letter a fixed number of spaces to the left or right?
A. Single substitution
B. Multi substitution
C. XOR
D. Bit shifting


D. Bit shifting

Substitution of single letters separately—simple substitution—can be demonstrated by writing out the alphabet in some order to represent the substitution. This is termed a substitution alphabet. The cipher alphabet may be shifted or reversed (creating the Caesar and Atbash ciphers, respectively) or scrambled in a more complex fashion, in which case it is called a mixed alphabet or deranged alphabet.

Question # 2
Which of the following uses an 80 bit key on 64 bit blocks?
A. Skipjack
B. Twofish
C. DES
D. AES


A. Skipjack


Question # 3
You are explaining basic mathematics to beginning cryptography students. You are covering the basic math used in RSA. A prime number is defined as
A. Odd numbers with no divisors
B. Odd numbers
C. Any number only divisible by odd numbers
D. Any number only divisible by one and itself


C. Any number only divisible by odd numbers

A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4. Primes are central in number theory because of the fundamental theorem of arithmetic: every natural number greater than 1 is either a prime itself or can be factorized as a product of primes that is unique up to their order.

Question # 4
Created in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT. Most widely used public key cryptography algorithm. Based on relationships with prime numbers. This algorithm is secure because it is difficult to factor a large integer composed of two or more large prime factors.
A. PKI
B. DES
C. RSA
D. Diffie-Helmann


C. RSA


Question # 5
What is the solution to the equation 8 mod 3?
A. 1
B. 4
C. 3
D. 2


D. 2

The modulo operation returns the remainder or signed remainder of a division, after one number is divided by another (called the modulus of the operation).
Given two positive numbers a and n, a modulo n (abbreviated as a mod n) is the remainder of the Euclidean division of a by n, where a is the dividend and n is the divisor. The modulo operation is to be distinguished from the symbol mod, which refers to the modulus (or divisor) one is operating from.
For example, the expression "5 mod 2" would evaluate to 1, because 5 divided by 2 has a quotient of 2 and a remainder of 1, while "9 mod 3" would evaluate to 0, because the division of 9 by 3 has a quotient of 3 and a remainder of 0; there is nothing to subtract from 9 after multiplying 3 times 3.

Question # 6
When learning algorithms, such as RSA, it is important to understand the mathematics being used. In RSA, the number of positive integers less than or equal to some number is critical in key generation. The number of positive integers less than or equal to n that are coprime to n is called ______.
A. Mersenne's number
B. Fermat's number
C. Euler's totient
D. Fermat's prime


C. Euler's totient


Question # 7
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A. Atbash
B. Vigenere
C. Caesar
D. Scytale


A. Atbash

Atbash is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use with any known writing system with a standard collating order.

Question # 8
Fred is using an operating system that stores all passwords as an MD5 hash. What size is an MD5 message digest (hash)?
A. 160
B. 512
C. 256
D. 128


D. 128


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ECCouncil 212-81 Exam Dumps

Exam Name: EC-Council Certified Encryption Specialist (ECES)
Certification Name: ECES

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