Match the following Secret Key Algorithms (list I) with Corresponding Key…
2018
Match the following Secret Key Algorithms (list I) with Corresponding Key Lengths (List II) and choose the correct answer from the code given below:
\(\begin{array} { } & \text{List I} & { } & \text{List II} \\ (a) & \text{Blowfish} & (i) & \text{128 – 256 bits} \\ (b) & \text{DES} & (ii) & \text{128 bits} \\ (c ) & \text{IDEA} & (iii) & \text{1-448 bits} \\ (d) & \text{RC5} & (iv) & \text{ 56 bits} \end{array}\)
\(Code:\)
- A.
(a) – (iv), (b)-(ii), (c ) -(ii) , d-(i)
- B.
(a) – (iii), (b)-(iv), (c ) -(i) , d-(ii)
- C.
(a) – (iii), (b)-(iv), (c ) -(ii) , d-(i)
- D.
(a) – (ii), (b)-(iii), (c ) -(iv) , d-(i)
Attempted by 195 students.
Show answer & explanation
Correct answer: C
Correct matching with brief justifications:
Blowfish: variable key size up to 448 bits (commonly 32–448 bits), so it matches the 1–448 bits entry.
DES: uses a 56-bit key, so it matches the 56 bits entry.
IDEA: uses a 128-bit key, so it matches the 128 bits entry.
RC5: supports variable key sizes and is commonly used with keys in the 128–256 bit range, so it matches the 128–256 bits entry.
Therefore the correct pairings are: Blowfish → 1–448 bits; DES → 56 bits; IDEA → 128 bits; RC5 → 128–256 bits.
A video solution is available for this question — log in and enroll to watch it.