Crypto is a beautiful topic with lots of open problems and room for further research. I hope everyone learned a lot and enjoyed the material. This is the last week of this Crypto I course.
Please don't be shy about posting questions in the forum. The problem set this week involves a bit more math than usual, but should expand your understanding of public-key encryption. The lectures contain suggestions for further readings for those interested in learning more about CCA secure public-key systems. There has been a ton of research on CCA security over the past decade and given the allotted time we can only summarize the main results from the last few years. We construct systems that are secure against tampering, also known as chosen ciphertext security (CCA security). The videos cover two families of public key encryption systems: one based on trapdoor functions (RSA in particular) and the other based on the Diffie-Hellman protocol. Public key encryption is used for key management in encrypted file systems, in encrypted messaging systems, and for many other tasks.
This week's topic is public key encryption: how to encrypt using a public key and decrypt using a secret key. Using (var file = new FileStream(filename, FileMode.Week 6. Ĭ# / Encryption Console.Write("Input string:")
my "message" together with padding bytes)Īre there any caveats/pitfalls I'm not aware of on either side? I'm kind of out of ideas. I'm using PKCS#1 padding on the C# side (setting the fOAEP parameter of RSACryptoServiceProvider.Encrypt to false), so I'd expect that after decrypting the block in python I should see some kind of clear text (i.e.
Encryption/decryption works on both sides independently. NET doesn't support the standard PEM/DER format directly). I've managed both sides to use the same key (which was not even trivial since. NET classes on the C# side and pycrypto on python side. I'm trying to encrypt a short message using RSA algorithm in C# and decrypt the message using a python skript.
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