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Exam Name: Certified Encryption Specialist

Exam Code:
212-81
ECES

Related Certification(s): Eccouncil Certified Encryption Specialist Certification

Certification Provider: Eccouncil

Actual Exam Duration: 120 Minutes

Number of 212-81 practice questions in our database:
206 (updated: Sep. 04, 2024)

Expected 212-81 Exam Topics, as suggested by Eccouncil :

**Topic 1:**Information Theory Cryptography Concepts/ Multi-Alphabet Substitution**Topic 2:**Introduction and History of Cryptography/ Breaking the Vigenère Cipher**Topic 3:**Symmetric Cryptography & Hashes/ Single Substitution Weaknesses**Topic 4:**Symmetric Block Cipher Algorithms/ Basic Facts of the Feistel Function**Topic 5:**International Data Encryption Algorithm (IDEA)/ History of Cryptography**Topic 6:**Number Theory and Asymmetric Cryptography/ Advanced Encryption Standard (AES)**Topic 7:**Propagating Cipher-Block Chaining (PCBC)/ Naor-Reingold and Mersenne Twister Pseudorandom Function**Topic 8:**Server-based Certificate Validation Protocol/ Classification of Random Number Generator**Topic 9:**Shiva Password Authentication Protocol (S-PAP)/ Challenge-Handshake Authentication Protocol (CHAP)**Topic 10:**Point-to-Point Tunneling Protocol (PPTP)/ National Security Agency and Cryptography**Topic 11:**Cracking Modern Cryptography: Ciphertext-only and Related-key Attack/ Cracking Modern Cryptography: Chosen Plaintext Attack**Topic 12:**Steganography Implementations/ Example of Symmetric Stream Ciphers: RC4**Topic 13:**Birthday Paradox: Probability/ Mono-Alphabet Substitution**Topic 14:**Cracking Modern Cryptography/ Example of Symmetric Stream Ciphers: PIKE

Question #1

Question #2

____________cryptography uses one key to encrypt a message and a different key to decrypt it.

Asymmetric

https://en.wikipedia.org/wiki/Public-key_cryptography

Public-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys, which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one-way functions. Effective security only requires keeping the private key private; the public key can be openly distributed without compromising security.

Question #3

Question #4

During the process of encryption and decryption, what keys are shared?

Public keys

https://en.wikipedia.org/wiki/Public-key_cryptography

Public-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys, which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one-way functions. Effective security only requires keeping the private key private; the public key can be openly distributed without compromising security.

In such a system, any person can encrypt a message using the receiver's public key, but that encrypted message can only be decrypted with the receiver's private key.

Alice and Bob have two keys of their own --- just to be clear, that's four keys total. Each party has their own public key, which they share with the world, and their own private key which they well, which they keep private, of course but, more than that, which they keep as a closely guarded secret. The magic of public key cryptography is that a message encrypted with the public key can only be decrypted with the private key. Alice will encrypt her message with Bob's public key, and even though Eve knows she used Bob's public key, and even though Eve knows Bob's public key herself, she is unable to decrypt the message. Only Bob, using his secret key, can decrypt the message assuming he's kept it secret, of course.

Alice and Bob do not need to plan anything ahead of time to communicate securely: they generate their public-private key pairs independently, and happily broadcast their public keys to the world at large. Alice can rest assured that only Bob can decrypt the message she sends because she has encrypted it with his public key.

Question #5

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?

Vigenre

https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

The Vigenre cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.

First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenre ciphers. In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenre ciphers.

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