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Codes and Ciphers by Robert C. S. Adey. Originally published in The Mystery Lover’s Newsletter, 1969. Vol II No. 6, pp. 10/11: Like so many other things, Mr. Edgar Al...
I've thought up a cipher method. Here are three messages enciphered using it, for you to decipher. They're arranged from easiest to hardest. I'm not sure how hard it'll be to decip...
How do I understand the following? 1242113331 1818111411 9291131113 3311272113 3311747192 9160611030 1143411333 1154511131 1165611555 1147411333 1106019291 6061165611 3331147411 14...
Can you figure out what this cypher says and how it works? The scribbles are mistakes. Hexagons with no ticks are spaces. The code is in the ticks and dots, not in imperfect hexago...
Researchers are using machine learning algorithms to decrypt historical pencil-and-paper ciphers.
A San Francisco company paid nearly $1 million for the solution to an unsolved code in Kryptos, a sculpture on the C.I.A. grounds. Soon it will become an online challenge.
I've enjoyed cryptic crosswords for many years (never been too good at them, but that is another matter). I also like numbers, patterns and puzzles. This is my first attempt to com...
Cryptography is the practice and study of techniques for secure communication in the presence of third parties. It is also used to set up a secure connection between two systems. C...
Back when the US government classified strong encryption as “munitions,” RSA public key cryptography was illegal to export. In 1995, Adam Back protested this by creating a terse, o...
Kryptos is a sculpture by artist Jim Sanborn on the grounds of CIA headquarters in Langley, Virginia. Dedicated on November 3, 1990, it carries four encrypted messages. "Of these f...
A cryptic message, a book cipher hidden in art provenance records, and a trail of clues leading to the leader of a shadowy cyber organization. The post KDA: Echoes of Deception - C...
It Started With a Simple Thought Sometimes we share things that aren't meant for everyone. Not huge secrets. Just things like: API keys Notes IDs Tokens Small messages Test d...
The following image has a short message encoded in it. It's not just in the digital image file; the message can be recovered from the physical drawing on paper. hint 1: hint 2:...
I found this thing full of numbers and a few other symbols from this website, and I'm trying to figure out its identity. I feel like I'm missing something very obvious, but I am co...
They swear they haven’t peeked at the closely guarded secret and that they’ll keep the cryptographic competition going.
Newly declassified files reveal that J. Edgar Hoover wanted to prosecute the NSA’s future scholar in residence for collecting cryptography manuals.
Every time you open your banking app, send a private message, or log into your company's systems, a math problem is standing between your data and the rest of the world. A very spe...
Cicada 3301 is the name of "three sets of puzzles posted under the name '3301' online between 2012 and 2014." The first appeared on 4chan on January 4, 2012, and ran for nearly a m...
The business of terrorist organisations having a line of communication is a murky one.
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