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RE: Introduction to Cryptography I: Encryption (Pt. 4 - Block Ciphers/Modes of Operation)
I once heard about Quantum Cryptography (can't remember where though), but I want to ask; does it have any direct/indirect relationship with any of the cipher methods you listed in the post? If yes, which of them?
PS: That image on the right (in the exercise you gave) looks like it had some hidden Steganographic codes in it - I mean; like some text codes are being hidden in it. I might be wrong though.
Nice post there
Quantum cryptography actually has much stronger ties to information theory than the cryptography we're talking about here. There's also quantum-resistant cryptography, which aims to re-create the existing systems we have in ways that are resistant to quantum computers.
The algorithms most endangered by the ever-looming threat of generalised quantum computing are actually our most popular public key cryptography schemes. Symmetric cryptography (where the key is the same on both sides; the block ciphers and stream ciphers we've been learning about) is actually mostly safe from that stuff.
It's not steganography, but if I can fit it in, I'd love to do a post on steganography! Maybe I'll do it as a separate post. If I do I'll credit you for giving me the idea!
Thanks a lot. I would be honoured