Last year, the UK's intelligence agency made headlines with its 'Can You Crack It?' online code. This year, the campaign is called 'Can You Find It?' GCHQ describes 'Can You Find It?' as a cyber treasure hunt designed to challenge "experienced and self-taught techies." Participants will have to crack a series of codes created by GCHQ mathematicians in exchange for clues. These clues will lead users to different places around the internet and eventually unlock the final answer.

GCHQ is targeting candidates with the intellectual ability, though not necessarily the practical experience or qualifications, to join GCHQ's cyber security team.

"The 21st century is confronting us with online threats that are difficult and dangerous, so we want employees who have evolved with the ever-changing digital world and therefore have the right skills to combat these challenges," said GCHQ’s Head of Resourcing, Jane Jones. " It’s a puzzle but it’s also a serious test – the jobs on offer here are vital to protecting national security."

The challange is now live on canyoufindit.co.uk. Entrants will have six weeks to hunt down four codes, each of which must be entered into the challenge website in order to unveil the next clue. Successful entrants will also be entered into a draw for a Raspberry Pi and a Google Nexus 7.