Data diodes provide physically guaranteed one-way communications in computer networks. Data diodes can be built using commercial off the shelf components, such as by disconnecting the receive end of a fiber transceiver. Several dedicated appliances are also available. Traditionally, data diodes have been used in high security settings, such as military or industrial control systems. Data diodes might also have a place in other industries, such as health care or finance, especially to transmit logs, analytics, usage, or billing information.
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Shorts posts for your enjoyment.
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Encrypted & authenticated data diode communications
Network security Cryptography November 14, 2023
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Two cryptographers playing cards
Cryptography October 02, 2023
I tooted the following puzzle:
Do you teach cryptography? If yes, ask your students to design a protocol for two people to play a cards game over the internet (eg Uno, Gin Rummy, Go fish or whatever). The protocol should be trustless so the players don’t have to rely on a centralized server to deal cards and players shouldn’t be able to peek at the deck unless the game rule allows it.
Give extra points to students who come up with simpler protocols, formal proofs, or an actual implementation.
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Cryptopals
Cryptography Challenges August 16, 2023
9+ years later, Cryptopals remains a tremendously valuable tool for learning about cryptography by working on practical pieces of code. Cryptopals is a collection of 8 sets of challenges, starting very gently and ending with some non-trivial problems. By working through these challenges you will implement various cryptosystems and well known attacks.