Rules:
- The messages can go as far back as the beginning of the 7 day period (the moment you found out about your assassin is after you)
- You can only send the messages if you have cell signal (maybe don’t hide in the woods, you assassin might be there, and you don’t get a do-over 🙃)
- Your phone is immune to damage and malware (although spyware and keyloggers can still be on there, but they can’t affect the system, just on “read only” mode). Auto-updates are now disabled by default
- If assassin got your phone, they could send false messages to trick your past self. (Don’t lose your phone!)
- At the end of 7 days, the Assassin will just drop dead due to time travel limitations, time travelers cannot survive longer than 7 days in the past (yes, the assassin is a time traveler 😉)
[P.S: El Psy Congroo]
Assuming you can change the future, you can send a message with your location history every x minutes to your 1-day (or more) ago self. You will have to encode it (and I guess this should be done outside the phone) in a way that the assassin can’t spoof a message. You’ll have to figure out that encoding as soon as you find out about the assassin since that’s your message travel limit anyway. When you start receiving messages you follow that location history and then stop following it when you stop receiving them because something went wrong there. Eventually some instance of you might make it 7 days.