We here at Vulture Central know how fond our readers are of codebreaking challenges, so we're happy to point would-be cryptographers in the direction of the Thawte Crypto Challenge IV.

Thawte explains it thus: "The Crypto Challenge is a fun, on-going competition aimed at Cipher hobbyists able to crack level 3 - 4 of Simon Singh's Cipher Challenge. The mysterious cipher genius Mr X develops the Crypto Challenges to be cracked. The first person to crack the code, wins the main prize: a Nikon Cool Pix SQ digital camera, there are runner's up prizes too."

Can't be bad. In addition Thawte offers "The Lunch Hour Challenge, developed for people interested in Cryptography but still learning". No prizes for this one, but a good for a bit of practice.

For full details and registration, click here. ®