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Theory

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Procedure

Simulation

Posttest

References

Feedback

Experiment 7: Encryption of plaintext using Twofish algorithm

Choose difficulty:

Beginner

Intermediate

Advanced

What does the F function in Twofish involve?

a: Bitwise XOR only Explanation

Explanation

b: Substitution-permutation networks, key mixing, and bitwise operations Explanation

Explanation

c: Modular addition only Explanation

Explanation

d: Feistel network structure Explanation

Explanation

What is the purpose of the Mixing and Swapping step in Twofish?

a: To add an extra layer of security Explanation

Explanation

b: To ensure both halves contribute to the final output Explanation

Explanation

c: To perform key mixing Explanation

Explanation

d: To divide the block into fixed-size blocks Explanation

Explanation

What is the size of the blocks Twofish operates on?

a: 64 bits Explanation

Explanation

b: 128 bits Explanation

Explanation

c: 256 bits Explanation

Explanation

d: 512 bits Explanation

Explanation

What is the purpose of key whitening in Twofish?

a: To swap the halves of plaintext Explanation

Explanation

b: To XOR the plaintext with subkeys before and after rounds Explanation

Explanation

c: To generate random numbers Explanation

Explanation

d: To reduce encryption time Explanation

Explanation

Twofish provides security mainly due to:

a: Large block size only Explanation

Explanation

b: Key-dependent S-boxes and MDS matrix operations Explanation

Explanation

c: Single-round encryption Explanation

Explanation

d: Public key cryptography principles Explanation

Explanation

Which operation is NOT part of the Twofish encryption process?

a: Key Whitening Explanation

Explanation

b: F-function with modular addition and XOR Explanation

Explanation

c: InvSubBytes Explanation

Explanation

d: MDS matrix multiplication Explanation

Explanation

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