Don't tell them your PIN, Pike.
The Regulation of Investigatory Powers Act (RIPA) has had a clause activated which allows a person to be compelled to reveal a decryption key. Refusal can earn someone a five-year jail term.
The measure has been criticised by civil liberties activists and security experts who say that the move erodes privacy and could lead a person to be forced to incriminate themselves.
It is also controversial because a decryption key is often a long password – something that might be forgotten. An accused person might pretend to have forgotten the password; or he might genuinely have forgotten it but struggle to convince a court to believe him.
Controversially, someone who receives a Section 49 notice can be prevented from telling anyone apart from their lawyer that they have received such a notice.
Five years for forgetting a password? I'm stuffed, I can't even recall my PIN without my sooper secret system and even then, despite using the same one for 25 years, sometimes I'm left gormless at the ATM trying to recall how many days there are in February and March with the queue growing impatiently restless behind me.