SHA-1 vs SHA-2: Hashing Algorithms Comparison

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Which hashing algorithm is a legacy algorithm and should be avoided?

SHA-1 (correct)
SHA-256
SHA3-256
SHA-384

Which hashing algorithm family includes SHA-224, SHA-256, SHA-384, and SHA-512?

MD5
SHA-2 (correct)
SHA-1
SHA-3

What is recommended to use instead of SHA-1 for hashing purposes?

SHA-2 or SHA-3 (correct)
SHA-256
MD5
SHA3-512

Which organization introduced SHA-3 as an alternative to SHA-2?

National Institute of Standards and Technology (NIST) (D) Signup and view all the answers

Which hashing algorithm is the newest and meant to replace the SHA-2 family in the future?

SHA-3 (B) Signup and view all the answers

What is the basis of the protection mechanism of HMACs?

The cryptographic strength of the underlying hash function (A) Signup and view all the answers

How does HMAC ensure authenticity in data exchange?

By involving only the sender and receiver who know the secret key (D) Signup and view all the answers

What aspect of HMAC defeats man-in-the-middle attacks?

The quality of the key used (B) Signup and view all the answers

Which two factors determine the cryptographic strength of HMAC?

Size and quality of the key (C) Signup and view all the answers

In Cisco technologies, what is HMAC-MD5 based on?

SHA-1 hashing algorithm (D) Signup and view all the answers

What is the significance of matching generated and sent HMACs?

Validates integrity and authenticity of data (D) Signup and view all the answers

What is considered the most difficult part of designing a cryptosystem?

Key Generation (B) Signup and view all the answers

Why is it important to use good random number generators in key generation?

To ensure all keys are equally generated (A) Signup and view all the answers

What is the purpose of key verification procedures in cryptography?

To identify and regenerate weak keys (A) Signup and view all the answers

Why should a key of 0 or 25 not be used with the Caesar cipher?

They produce weak encryption (B) Signup and view all the answers

In a modern cryptographic system, who usually chooses the key?

Sender and receiver (C) Signup and view all the answers

Why should key management procedures provide a secure exchange mechanism for keying material?

To allow secure agreement on keys over an untrusted medium (C) Signup and view all the answers

What is the purpose of using modular arithmetic in Diffie-Hellman key exchange?

To create a public value based on secret numbers (D) Signup and view all the answers

In the given scenario, what does the base number 'g' represent?

The generator for modular calculations (C) Signup and view all the answers

Which step involves Alice sending her public value to Bob in the Diffie-Hellman key exchange process?

Step 4 (D) Signup and view all the answers

What is the significance of the secret numbers generated by Alice and Bob in the DH key exchange?

They are used to calculate the public values exchanged (D) Signup and view all the answers

Why does the text mention that DH uses 'unbelievably large numbers' in its calculations?

To highlight the security strength of DH (D) Signup and view all the answers

What happens if Alice and Bob do not agree on the same base number 'g' in DH key exchange?

The key exchange process fails (A) Signup and view all the answers

What is the primary purpose of HMAC in communication security?

To authenticate the sender and receiver (B) Signup and view all the answers

Which encryption algorithm uses the same pre-shared key for both encryption and decryption?

3DES (B) Signup and view all the answers

What is the main objective of using cryptographic hashes such as SHA-2?

To ensure data integrity (A) Signup and view all the answers

How do asymmetric encryption algorithms differ from symmetric encryption algorithms?

Symmetric algorithms use different keys for encryption and decryption (B) Signup and view all the answers

What is the science that involves creating and breaking secret codes?

Cryptography (C) Signup and view all the answers