Assignment Tasks

You are expected to complete the following tasks:

1. Stage 1

(a) Implement the cipher as a class which implements the provided interface.

• Implement the S-box functionality as a class

• Implement the permutation as a class which provides the required bit manipulation functions

(b) Test the cipher by constructing a JUnit test suite which con?rms that the cipher's methods operate correctly

(c) Implement a program which uses the cipher to encrypt and decrypt ?les.

Stage 2

(a) Implement a birthday paradox attack on a compression hash function