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NEW QUESTION 34
A _____ is a function is not reversible.

• A. Hash
• B. Block Cipher
• C. Asymmetric cipher
• D. Stream cipher

Answer: A

Explanation:
Hash
https://en.wikipedia.org/wiki/Hash_function
Hash functions are irreversible. This is actually required for them to fulfill their function of determining whether someone possesses an uncorrupted copy of the hashed data. This brings susceptibility to brute force attacks, which are quite powerful these days, particularly against MD5.

NEW QUESTION 35
What is an IV?

• A. A fixed size random stream that is added to a block cipher to increase randomeness
• B. The key used for a cryptography algorith
• C. Random bits added to a hash
• D. The cipher used

Answer: A

Explanation:
A fixed size random stream that is added to a block cipher to increase randomeness
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Initialization_vector_(IV) An initialization vector (IV) or starting variable (SV) is a block of bits that is used by several modes to randomize the encryption and hence to produce distinct ciphertexts even if the same plaintext is encrypted multiple times, without the need for a slower re-keying process.

NEW QUESTION 36
Which of the following is assured by the use of a hash?

• A. Availability
• B. Confidentiality
• C. Integrity
• D. Authentication

Answer: C

Explanation:
Integrity
https://en.wikipedia.org/wiki/Cryptographic_hash_function#Verifying_the_integrity_of_messages_and_files An important application of secure hashes is verification of message integrity. Comparing message digests (hash digests over the message) calculated before, and after, transmission can determine whether any changes have been made to the message or file.

NEW QUESTION 37
Which of the following uses an 80 bit key on 64 bit blocks?

• A. AES
• B. Twofish
• C. Skipjack
• D. DES

Answer: C

Explanation:
Skipjack
https://en.wikipedia.org/wiki/Skipjack_(cipher)
Skipjack uses an 80-bit key to encrypt or decrypt 64-bit data blocks. It is an unbalanced Feistel network with 32 rounds.
Incorrect answers:
Twofish - is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of the Advanced Encryption Standard contest, but it was not selected for standardization. Twofish is related to the earlier block cipher Blowfish.
AES - For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.
DES - Data Encryption Standard is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.

NEW QUESTION 38
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