For five decades, many have tried to crack the Zodiac's Z13 cipher - which promises to reveal the killer's true name. Now, ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

Imagine a security guard protecting a vault. What if the thief is smarter than the guard? This is precisely the situation ...

For decades, a handful of Dead Sea fragments written in an unknown alphabet sat in scholarly limbo, legible in shape but mute ...

If you fancy yourself as a budding spy, GCHQ’s Christmas challenge will put your analytical skills to the test. The UK spy agency, which sets an annual quiz aimed at children aged between 11 and 18, ...

More than 500 schoolchildren took part in a competition to design the cover of the card. They were asked: “What do you think GCHQ looks like on Christmas Day?”, with the additional task of including ...

As a small business owner, Liz understands the unique challenges entrepreneurs face. Well-versed in the digital landscape, she combines real-world experience in website design, building e-commerce ...

Learn about currency substitution, its types, benefits, and potential risks, and why some countries use foreign currencies for extra stability and economic advantage.

"One of the weapons originating from the Two Fingers. A formless sequence of ciphers comprise its blade, and as such no shield can repel it. Deals holy damage. The furtive inscription appears to hang ...