A hi-tech terrorist has admitted hiding his Islamic State activities in a James Bond-style cuff link.
Samata Ullah, 34, from Cardiff, admitted membership of IS in September last year, being involved in terrorist training, and preparation of terrorist acts.
At the time of his arrest, he had a USB cufflink with a Linux operating system loaded onto it to conceal a hoard of extremist data, including a blog.
At an Old Bailey hearing, Ullah pleaded guilty to five terror offences including possession of an article for terrorist purposes on or before September 22 last year.
From December 2015, he had provided instructional videos on how to secure sensitive data and remain anonymous online with the use of the Tor programme, and PGP (Pretty Good Privacy) encryption.
Ullah admitted researching ZeroNet and developing a version of a blog site using the decentralised internet-like peer-to-peer network.
He also pleaded guilty to having a book entitled Guided Missiles Fundamentals AFM 52-31 and an electronic PDF version of the book Advances In Missile Guidance, Control, And Estimation for terrorist purposes.
However, he denied a charge of directing terrorism between December 2015 and September last year contrary to section 56 of the Terrorism Act 2000.
Prosecutor Brian Altman QC said the Crown had accepted the pleas after referring to the Attorney General.
He asked for the remaining charge to lie on file.
The court heard Ullah had since been diagnosed with autism.
Mr Altman said a hi-tech report dealt with the defendant's desire to copy his blog onto a platform in a "format that meant it could not be closed down or deleted by the authorities".
Judge Gerald Gordon lifted reporting restrictions in the case.
He said the "issue of dangerousness" would have to be looked at before sentencing.