1. The Stream Cipher

The cipher has a key generator and a simple exclusive OR unit. The key generator is composed of two 256 bytes registers and pseudo-random number generator (PRNG) along with a key.
You should consult with the lecturer/tutor before you start the programming.
2. La Cipher-Feedback Mode (CFM)
CFM is based on the TSC cipher. The task is to link a several CFM ciphers to obtain a new cipher.

And just write a critical analysis whether this cipher system is secure.
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