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Cryptography Objective Questions and Answers

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This cryptography quiz contains carefully curated objective questions with correct answers and clear explanations. It is designed for developers, security learners, and interview preparation, covering modern encryption, hashing, authentication, and security best practices.

Practice Cryptography MCQs with Detailed Explanations

Answer at least 12 questions to submit.

16.
Hard 
Which algorithm is vulnerable to length extension attacks?
17.
Easy 
What is the key size of AES-256?
18.
Medium 
Which algorithm is commonly used for key exchange?
19.
Medium 
What does PBKDF2 stand for?
20.
Medium 
Which encryption mode is NOT recommended due to pattern leakage?
21.
Easy 
Which algorithm uses elliptic curves?
22.
Medium 
What is the main use of Shamir’s Secret Sharing?
23.
Medium 
Which algorithm is designed to be fast in software?
24.
Easy 
What does a CSR contain?
25.
Easy 
Which hashing algorithm produces a 256-bit output?
26.
Medium 
What is the purpose of Poly1305?
27.
Easy 
Which cryptographic primitive ensures confidentiality?
28.
Easy 
Which algorithm is commonly used for file encryption?
29.
Medium 
What is the main drawback of DES?
30.
Medium 
Which algorithm is recommended for modern TLS?
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