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Free ECCouncil 212-81 Practice Exam with Questions & Answers

Questions 1

With Cipher-block chaining (CBC) what happens?

Options:
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

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Questions 2

What is a "Collision attack" in cryptography?

Options:
A.

Collision attacks try to break the hash into three parts to get the plaintext value

B.

Collision attacks try to get the public key

C.

Collision attacks try to break the hash into two parts, with the same bytes in each part to get the private key

D.

Collision attacks try to find two inputs producing the same

Questions 3

A real time protocol for verifying certificates (and a newer method than CRL).

Options:
A.

Online Certificate Status Protocol (OCSP)

B.

Server-based Certificate Validation Protocol (SCVP)

C.

Public Key Infrastructure (PKI)

D.

Registration Authority (RA)

Questions 4

The next number is derived from adding together the prior two numbers (1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89).

Options:
A.

Odd numbers

B.

Fibonacci Sequence

C.

Fermat pseudoprime

D.

Prime numbers

Questions 5

The concept that if one bit of data changes, the cipher text will all completely change as well.

Options:
A.

Avalanche

B.

Substitution

C.

Confusion

D.

Collision

Questions 6

Which of the following would be the fastest.

Options:
A.

EC

B.

DH

C.

RSA

D.

AES

Questions 7

Which of the following are valid key sizes for AES (choose three)?

Options:
A.

192

B.

56

C.

256

D.

128

E.

512

F.

64

Questions 8

A _____ is a function is not reversible.

Options:
A.

Stream cipher

B.

Asymmetric cipher

C.

Hash

D.

Block Cipher

Questions 9

Which of the following is the standard for digital certificates?

Options:
A.

RFC 2298

B.

X.509

C.

CRL

D.

CA

Questions 10

A simple algorithm that will take the initial key and from that generate a slightly different key each round.

Options:
A.

Key Schedule

B.

Feistel Network

C.

SHA-2

D.

Diffie-Helman

Exam Code: 212-81
Certification Provider: ECCouncil
Exam Name: EC-Council Certified Encryption Specialist (ECES)
Last Update: Jul 15, 2025
Questions: 206