Twofish Decryption Simulation Procedure

Objective

The objective of this experiment is to simulate the Twofish decryption algorithm and provide students with a visual understanding of the internal workings of the decryption process. Participants will enter a 16-character ciphertext message, which will be internally converted to its corresponding 128-bit binary and hexa-decimal representation. The ciphertext will then undergo the standard 16-round Twofish decryption algorithm, and students will be able to view the internal workings for each round.

Experimental Setup

Input

1. Students input a 16-character ciphertext message.

Conversion

2. The entered ciphertext message is internally converted to the corresponding 128-bit binary representation.
3. The binary representation is further converted to its hexa-decimal representation.

Twofish Decryption

4. The hexa-decimal ciphertext is fed into the standard 16-round Twofish decryption algorithm.
5. Each round involves a series of predefined calculations.

Visualization

6. Hexa-decimal data is represented as a matrix for better understanding.
7. Each step of the decryption process is clearly visualized to aid student comprehension.

User Interaction

8. Students can click provided buttons to view the internal workings of the decryption process for each round.

Intermediate Result

9. Participants will be asked to calculate the (k+1)th intermediate result after the first k rounds.

Evaluation

10. If the student provides the correct answer, the remainder of the decryption simulation will be shown.

Conclusion

This experiment aims to enhance students' understanding of the Twofish decryption algorithm by providing a hands-on, visual representation of the process. The interactive nature of the simulation encourages active participation and reinforces theoretical knowledge.