Data Integrity Algorithms Questions and Answers – Secure Hash Algorithms (SHA) – I

This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “Secure Hash Algorithms (SHA) – 1”.

1. SHA-1 produces a hash value of
a) 256 bits
b) 160 bits
c) 180 bits
d) 128 bits
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2. What is the number of round computation steps in the SHA-256 algorithm?
a) 80
b) 76
c) 64
d) 70
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3. In SHA-512, the message is divided into blocks of size ___ bits for the hash computation.
a) 1024
b) 512
c) 256
d) 1248
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4. What is the maximum length of the message (in bits) that can be taken by SHA-512?
a) 2¹²⁸
b) 2²⁵⁶
c) 2⁶⁴
d) 2¹⁹²
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5. The message in SHA-512 is padded so that it’s length is
a) 832 mod 1024
b) 768 mod 1024
c) 960 mod 1024
d) 896 mod 1024
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6. The big-endian format is one in which
a) the least significant byte is stored in the low-address byte position
b) the least significant byte is stored in the high-address byte position
c) the most significant byte is stored in the high-address byte position
d) the most significant byte is stored in the low-address byte position
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7. In SHA-512, the registers ‘a’ to ‘h’ are obtained by taking the first 64 bits of the fractional parts of the cube roots of the first 8 prime numbers.
a) True
b) False
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8. What is the size of W (in bits) in the SHA-512 processing of a single 1024- bit block?
a) 64
b) 128
c) 512
d) 256
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9. In the SHA-512 processing of a single 1024- bit block, the round constants are obtained
a) by taking the first 64 bits of the fractional parts of the cube roots of the first 80 prime numbers
b) by taking the first 64 bits of the fractional parts of the cube roots of the first 64 prime numbers
c) by taking the first 64 bits of the fractional parts of the square roots of the first 80 prime numbers
d) by taking the first 64 bits of the non-fractional parts of the first 80 prime numbers
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10. The output of the N 1024-bit blocks from the Nth stage is
a) 512 bits
b) 1024 bits
c) N x 1024bits
d) N x 512 bits
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11. What does the figure represent?

a) Compression function
b) Message digest generation using SHA
c) Elementary SHA operation for single round
d) Processing of a single 1024 bit block
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12. Among the registers ‘a’ to ‘h’ how many involve permutation in each round?
a) 4
b) 5
c) 6
d) 3
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Sanfoundry Global Education & Learning Series – Cryptography and Network Security.

To practice all areas of Cryptography and Network Security, here is complete set of 1000+ Multiple Choice Questions and Answers.

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