Encryption and password locks are pointless against a cartel, presumably they will employ rubber hose cryptanalysis to get any information they want.
Seems like one solution would be to have a web browser that keeps no history, and use that to log into Twitter and report about cartels instead of an app that automatically logs you in or keeps history, or gives away the fact you have a twitter account they will demand to know about.
If it's any small comfort, whoever was seen involved in this kidnapping is now a liability, as this case has brought a lot of heat so they were almost certainly finished off in the desert by their own cartel compadres to avoid potential snitching. The blog borderlandbeat has countless posts of mass executions the cartels do on their own guys as everybody except the capos are disposable.
edit: Likely cartels have employees at telecoms in Mexico to look up logs for them, there's prob no easy solution. It wouldn't be expensive for them to hire anybody to exploit journalists with old carrier builds that are never updated either http://nakedsecurity.sophos.com/2014/09/16/shocking-android-...
Seems like one solution would be to have a web browser that keeps no history, and use that to log into Twitter and report about cartels instead of an app that automatically logs you in or keeps history, or gives away the fact you have a twitter account they will demand to know about.
There's also schemes like this which could be helpful to at risk journalists https://www.ccsl.carleton.ca/~askillen/mobiflage/ unless you are kidnapped while in PDE mode.
If it's any small comfort, whoever was seen involved in this kidnapping is now a liability, as this case has brought a lot of heat so they were almost certainly finished off in the desert by their own cartel compadres to avoid potential snitching. The blog borderlandbeat has countless posts of mass executions the cartels do on their own guys as everybody except the capos are disposable.
edit: Likely cartels have employees at telecoms in Mexico to look up logs for them, there's prob no easy solution. It wouldn't be expensive for them to hire anybody to exploit journalists with old carrier builds that are never updated either http://nakedsecurity.sophos.com/2014/09/16/shocking-android-...