An anonymous reader writes: With all the mass market GPS devices, especially those built into mobile phone devices, this would seem like an obvious way to beat bad speeding tickets, such as those given out in the UK and other countries due to faulty or inaccurate equipment operated by police. Automated tickets take months to arrive, this generally leaves you with no recourse to prove yourself innocent, but there is precedents in beating bad tickets with black-box style GPS devices to prove your speed was lower than what the police claimed. The problem I envisage is that any data recorded and stored could also be used by police or others against you.
Encryption seems like the obvious answer, but if encryption were to be used in any number of countries that have enacted decryption laws, some people would face the prospect of jail time until you hand over decryption keys or passwords.
Does anyone know, or can suggest something that would avoid jail, but also avoid self incrimination?