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ECCouncil 212-81 Test Dumps

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Question # 1



If the round function is a cryptographically secure pseudorandom function, then ___rounds is sufficient to make it a "strong" pseudorandom permutation.
A. 15
B. 16
C. 3
D. 4



D.   4




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



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 # 4



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 # 5



How does Kerberos generate the first secret key in the authentication process?
A. By generating a random AES key
B. By creating a hash of the user password
C. By hashing the user ID, network ID. and salt
D. By using the user's public key



B.   By creating a hash of the user password




Question # 6



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



B.   Blowfish




Question # 7



With Cipher-block chaining (CBC) what happens?
A. The block cipher is turned into a stream cipher
B. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
C. Each block of plaintext is XORed with the previous ciphertext block before being encrypted
D. The cipher text from the current round is XORed with the plaintext for the next round



C.   Each block of plaintext is XORed with the previous ciphertext block before being encrypted

In CBC mode, each block of plaintext is XORed with the previous ciphertext block before being encrypted. This way, each ciphertext block depends on all plaintext blocks processed up to that point. To make each message unique, an initialization vector must be used in the first block.



Question # 8



Network of trusted certificate authority servers. Use asymmetric key pairs and combines software, encryption and services to provide a means of protecting security of business communication and transactions.
A. PKI
B. GOST
C. CA
D. PIKE



A.   PKI

A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e-commerce, internet banking and confidential email. It is required for activities where simple passwords are an inadequate authentication method and more rigorous proof is required to confirm the identity of the parties involved in the communication and to validate the information being transferred.



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EC-Council Certified Encryption Specialist (ECES) Exam Dumps


Exam Code: 212-81
Exam Name: EC-Council Certified Encryption Specialist (ECES)

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