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Theory

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Posttest

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Experiment 8: Decryption of ciphertext using Twofish algorithm

Choose difficulty:

Beginner

Intermediate

Advanced

What is the initial step in the Twofish decryption process?

a: Inverse F-Function Explanation

Explanation

b: Key Schedule Explanation

Explanation

c: Feistel Network Decryption Explanation

Explanation

d: Subkey Mixing Explanation

Explanation

Which operation is a part of the F-function in Twofish during encryption?

a: Subkey Mixing Explanation

Explanation

b: MDS Matrix Multiplication Explanation

Explanation

c: XOR-ing with Constants Explanation

Explanation

d: Feistel Network Decryption Explanation

Explanation

What does the Feistel Network structure in Twofish do during decryption?

a: Applies F-function to both data halves simultaneously Explanation

Explanation

b: Mixes subkeys with the data Explanation

Explanation

c: Splits the data into two halves Explanation

Explanation

d: Reverses the order of subkeys Explanation

Explanation

What is the first step in Twofish decryption?

a: Inverse key whitening Explanation

Explanation

b: F-function application Explanation

Explanation

c: Swapping plaintext halves Explanation

Explanation

d: Generating random keys Explanation

Explanation

Which structure does Twofish use internally?

a: Substitution-Permutation Network (SPN) Explanation

Explanation

b: Feistel Network Explanation

Explanation

c: Linear Feedback Shift Register (LFSR) Explanation

Explanation

d: Merkle-Damgård Construction Explanation

Explanation

Maximum key size supported by Twofish?

a: 128 bits Explanation

Explanation

b: 192 bits Explanation

Explanation

c: 256 bits Explanation

Explanation

d: 512 bits Explanation

Explanation

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