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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Experiment 3 - DES Decryption

Choose difficulty:

Beginner

Intermediate

Advanced

What is the first step in the DES decryption process?

a: Round function application Explanation

Explanation

b: Final permutation Explanation

Explanation

c: Inverse initial permutation Explanation

Explanation

d: Key generation Explanation

Explanation

Which keys are used first in the process of DES decryption?

a: The first round keys Explanation

Explanation

b: The last round keys Explanation

Explanation

c: All keys at once Explanation

Explanation

d: No keys are used Explanation

Explanation

How many rounds are used in DES decryption?

a: 8 Explanation

Explanation

b: 10 Explanation

Explanation

c: 16 Explanation

Explanation

d: 32 Explanation

Explanation

Which permutation is applied first during DES decryption?

a: Final Permutation (FP) Explanation

Explanation

b: Initial Permutation (IP) Explanation

Explanation

c: Expansion permutation Explanation

Explanation

d: Key permutation Explanation

Explanation

DES decryption begins with splitting the ciphertext into:

a: Two 16-bit halves Explanation

Explanation

b: Two 32-bit halves Explanation

Explanation

c: Two 48-bit halves Explanation

Explanation

d: Two 56-bit halves Explanation

Explanation

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