The Voynich manuscript has puzzled cryptographers for a century. It’s hand-written in a writing system that's yet to be deciphered. Now a facsimile of the book is being published, to get to the bottom of the mystery.
We use ciphers to keep secrets secret. To crack ciphers, you need math, psychology and a slab of luck. It's not easy. Many great ciphers remain unsolved, as cryptologist Craig P. Bauer tells DW's Zulfikar Abbany.
If you were a wannabe hacker, here's how you'd use bitcoin to hold internet users to ransom. But be warned: You'd probably get caught - especially if you made mistakes like the WannaCry hackers.
You may never have used Bitcoin or other cryptocurrencies, but you're sure to have heard of the technology. Andrew Miller tells DW why they could spark a backlash against our surrendering of private data.
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