Using cheap magnet, hacker beats protections on a "smart" handgun.

This week the world’s elite hackers are gathering in Las Vegas for Def Con, the largest underground hacking event of the year.

The BBC’s North America technology reporter met a hacker who had circumvented protections on a handgun designed to make it impossible for unauthorised people to shoot.

Cyber-hacks season:

• Smart gun hacked with cheap magnets
• 'Ransomware here to stay' warns Google

• Cyber-security industry 'lacks empathy' claims Facebook

• North Korea hackers 'want cash not secrets'

This week BBC News is taking a close look at all aspects of cyber-security. The coverage is timed to coincide with the two biggest shows in the security calendar - Black Hat and Def Con.

Follow all our coverage via this link