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Download Certified Encryption Specialist Exam Dumps

Which of the following is required for a hash?

  • A. Variable length input, fixed length output
  • B. Minimum key length
  • C. Few collisions
  • D. Must use SALT
  • E. Not vulnerable to a brute force attack
  • F. Not reversible

Answer: A,F

Correct answers: Variable length input, fixed length output and Not reversible
A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes. The values are used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter storage addressing.


The most widely used digital certificate standard. First issued July 3, 1988. It is a digital document that contains a public key signed by the trusted third party, which is known as a Certificate Authority, or CA.
Relied on by S/MIME. Contains your name, info about you, and a signature of a person who issued the certificate.

  • A. RSA
  • B. ElGamal
  • C. X.509
  • D. PAP
  • E. 0

Answer: C

In cryptography, X.509 is a standard defining the format of public key certificates. X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, the secure protocol for browsing the web. They are also used in offline applications, like electronic signatures. An X.509 certificate contains a public key and an identity (a hostname, or an organization, or an individual), and is either signed by a certificate authority or self-signed. When a certificate is signed by a trusted certificate authority, or validated by other means, someone holding that certificate can rely on the public key it contains to establish secure communications with another party, or validate documents digitally signed by the corresponding private key.
Incorrect answers:
RSA – (Rivest-Shamir-Adleman) is a public-key cryptosystem that is widely used for secure data transmission.
ElGamal – asymmetric key encryption algorithm for public-key cryptography which is based on the Diffie-Hellman key exchange. It was described by Taher Elgamal in 1985.
PAP – used to authenticate users, but is no longer used because the information was sent in cleartext.


What is a TGS?

  • A. The server that escrows keys
  • B. The server that grants Kerberos tickets
  • C. A protocol for encryption
  • D. A protocol for key exchange

Answer: B

The server that grants Kerberos tickets
The client authenticates itself to the Authentication Server (AS) which forwards the username to a key distribution center (KDC). The KDC issues a ticket-granting ticket (TGT), which is time stamped and encrypts it using the ticket-granting service’s (TGS) secret key and returns the encrypted result to the user’s workstation. This is done infrequently, typically at user logon; the TGT expires at some point although it may be transparently renewed by the user’s session manager while they are logged in.


Collision resistance is an important property for any hashing algorithm. Joan wants to find a cryptographic hash that has strong collision resistance. Which one of the following is the most collisionresistant?

  • A. PIKE
  • B. MD5
  • C. MD4
  • D. SHA2

Answer: D

Collision resistance is a property of cryptographic hash functions: a hash function H is collision-resistant if it is hard to find two inputs that hash to the same output; that is, two inputs a and b where a ≠ b but H(a) = H(b). The pigeonhole principle means that any hash function with more inputs than outputs will necessarily have such collisions; the harder they are to find, the more cryptographically secure the hash function is.
Due to the Birthday Problem, for a hash function that produces an output of length n bits, the probability of getting a collision is 1/2^n/2.
So, just looking for a hash function with larger “n”.
The SHA-2 family consists of six hash functions with digests (hash values) that are 224, 256, 384 or 512 bits: SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, SHA-512/256.



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