Weekly CISSP Exam Questions
Which of the following is NOT a property of Secure Hash Algorithm (SHA)?
A. Irreversible
B. Fixed-length Output
C. Variable-length Output
D. Collision Resistance
Answer: C
Explanation:
SHA produces a fixed-length output and does not provide variable-length outputs.
- Irreversible: Hash functions like SHA are one-way functions.
- Fixed-length Output: Regardless of the input size, the output size remains constant.
- Variable-length Output: SHA does not have this property; the output is fixed in length.
- Collision Resistance: It is computationally difficult to find two different inputs that produce the same output.

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