added week 5 crypto

src/fall-24/crypto/crypto-5.md

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+# Crypto 2: Stream Ciphers
+by Gary Song
+
+RSA has a huge cultural signifigance for being the first pratical asymmetric cryptosystem, for which it was warded a turning award. For that reason, it is an important foundation for any aspiring cryptographer to study about. We cover the RSA cryptosystem, what it is, what calculations are needed, and a short proof on why it works. Later, we will discuss common attacks on the RSA cryptosystem
+
+## Slides
+<iframe src="https://docs.google.com/presentation/d/e/2PACX-1vTdZLqG-oOwBS3syoy3gbJ7uYe3T46ny9gkaZoGV3S9yhevPrArUL_ZIBzio4ecRG34_Ake_-OTOrCG/embed?start=false&loop=false&delayms=3000" frameborder="0" width="100%" style="aspect-ratio: 16 / 10;" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
+
+## Challenges
+The following challenges in increasing difficulty are deployed to [platform.acmcyber.com](https://platform.acmcyber.com) to practice the concepts covered in the slides.
+- Challenge 1 - `crypto/rsa-practice`
+- Challenge 2 - `crypto/rubiks-cube`
+- Challenge 3 - `crypto/prime-factory`
+- Challenge 4 - `crypto/rubiks-cube-2`
+
+## Resources
+The follow resources are great to practice/learn about the ciphers covered in the slides.
+- [pycryptodome](https://pypi.org/project/pycryptodome/): A library that implements many modern-day cryptographic algorithms.
+- [cryptohack](https://cryptohack.org/): A website with many challenges related to cryptography