Dennis Fisher talks with Nate Cardozo, senior information security counsel at the EFF, about a proposal from the UK's spy agency, GCHQ, that would insert a backdoor into encrypted communications by adding a "ghost", or invisible third party, to two-party conversations. The proposal is the latest in a long line of ideas to weaken or cripple encryption systems in the name of easier access for law enforcement and Dennis and Nate discuss the risks of the ghost method as well as what it could portend for users in other countries.