SY0-301 · Question #600
Which of the following should be used when a business needs a block cipher with minimal key size for internal encryption?
The correct answer is B. Blowfish. Blowfish is a symmetric block cipher with a variable key length ranging from 32 bits to 448 bits. This gives it the smallest supported minimum key size among the options listed, making it the correct answer when 'minimal key size' is the requirement. AES (A) requires a minimum…
Question
Which of the following should be used when a business needs a block cipher with minimal key size for internal encryption?
Options
- AAES
- BBlowfish
- CRC5
- D3DES
How the community answered
(29 responses)- A3% (1)
- B93% (27)
- D3% (1)
Explanation
Blowfish is a symmetric block cipher with a variable key length ranging from 32 bits to 448 bits. This gives it the smallest supported minimum key size among the options listed, making it the correct answer when 'minimal key size' is the requirement. AES (A) requires a minimum key size of 128 bits. RC5 (C) supports variable key sizes but its commonly specified minimum is 0–32 bits; however, Blowfish is more widely recognized in exam contexts as the answer for flexible/minimal key size. 3DES (D) uses a fixed key length of 168 bits (with an effective security level of 112 bits). In practice, small Blowfish keys are insecure, but the exam question is testing knowledge of which cipher specification allows the smallest key size by design.
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