Racket project for the Programming Paradigms course.

This project was done in 4 stages.

File: ppt.rkt

Writing simple programms. Working with lists and recursive functions on the stack.

Main functions:

• car
• cdr
• list

File: ppt2.rkt

The main focus in on curry and uncurry functions and the abstraction of functions with similar implementations.

Using functions like:

• map
• apply
• foldr / foldl

File: cryptosystem.rkt

At this stage it's implemented a cryptosystem with symmetric keys, in which the key generation is based on the theory of Pythagorean triplets.

Main concept: static variable binding expressions

File: ppt3.rkt

In the final stage the focus is on how we get an entire sequence ordered by TPP, where the order depends on the generation method used. First it is implemented the flow of triplets corresponding to the indexing we worked with in the previous stages, then another stream containing the same triplets in a different order, corresponding to a new method of generation.

Main concept: streams

1. Pythagorean Triples and Cryptographic Coding
2. Data Encryption and Decryption Using New Pythagorean Triple Algorithm