Tagged “cryptography”
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Boxentriq Cipher Identifier
A toolkit of cipher identifiers and solvers for cryptography enthusiasts trying to crack puzzle hunts, geocaching codes,…
CicadaSolvers
A collaborative research hub documenting the cryptographic Cicada 3301 internet puzzles, with a wiki, timelines, and ong…
Codes and Ciphers
A history site built by codebreaker Tony Sale, documenting the Enigma machine and the wartime cryptanalysis work at Blet…
Cryptii
A modular, visual playground for chaining together classical ciphers and encodings step by step, making it easy to see e…
Crypto 101
A free introductory course on cryptography covering block ciphers, hashing, key exchange and common pitfalls, aimed at r…
Crypto Museum
An extraordinarily detailed online museum documenting historic cipher machines, from the Enigma to Cold War spy radios a…
Cryptoclub
An educational outreach project teaching classical cipher-breaking through hands-on activities, letting visitors crack C…
CryptoHack
A gamified platform teaching modern cryptography through capture-the-flag style challenges, popular with security and cr…
CrypTool
An interactive cryptology learning site where you play with ciphers online, work through lessons, and solve puzzles to b…
Cryptopals Crypto Challenges
A famous set of forty-eight hands-on programming challenges that teach modern cryptography by having you break real-worl…
CyberChef
A browser-based cyber Swiss Army knife from GCHQ that stacks drag-and-drop operations to encode, decode, encrypt, compre…
dCode
A sprawling free library of hundreds of classical and modern cipher tools, letting curious visitors encode, decode, and…
beanishlang.wordpress.com
Education
Deciphering Beanish
A collaborative project trying to crack Beanish, a private script a woman invented and used for decades of personal writ…
English Letter Frequency Counts
Peter Norvig revisits Mayzner's classic letter frequency study using trillions of words of text, with tables of letter,…
Enigma
A working 3D model of the Enigma cipher machine where you can type, follow the electrical circuit through the rotors and…
Enigma
An interactive 3D Enigma machine you can type on, watching the rotors step and the signal path light up as each letter i…
Enigma Machine Emulator
An online emulator of the electro-mechanical Enigma rotor cipher machine, letting you set the rotors and encrypt or decr…
Enigma Machine Emulator
A faithful web emulator of historical Enigma cipher machines where you set rotors and plugboard, type a message and watc…
Homomorphic Encryption in iOS 18
A plain-language walk through the math that lets a server process your encrypted photos without ever seeing them, writte…
Horcrux
A playground for Shamir Secret Sharing in the browser: split a secret into pieces, then recombine enough of them to reco…
Jim Sanborn
Sculptures, installations and landscape projections by Jim Sanborn, creator of the encrypted Kryptos sculpture at CIA he…
Learn Me a Bitcoin
Plain-English explanations of how Bitcoin works under the hood, with technical guides on transactions, mining, and the b…
MysteryTwister C3
An international cryptography contest platform offering free cipher-cracking challenges at every skill level, from simpl…
NKRYPT Sculpture
Documents attempts to decipher NKRYPT, a cryptography sculpture outside Questacon in Canberra, with notes on its engrave…
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