Prosecuting counsel Peter Murphy told the jury that although the substance turned out to be flour, a major security operation had to be set up to intercept all post to the assembly in Cardiff Bay.

BBC: Anthrax hoaxer faces jail

Since 2005, security researchers have warned of the threat of "evil twins, " computers set up to appear as routers and intercept sensitive data.

FORBES: Accounting For Human Error

It is possible malicious hackers can intercept this data unless you set up a security such as a remote access virtual private network (VPN).

BBC: You could get online across London with the new plans.