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Temple OS?

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Would a UV filtering lens help? Do solar cells generate more power from certain parts of the light spectrum?

Serious question: what is a US multinational?

I can think of easier ways of compromising the data besides brute forcing the keys, off the top of my head, and I’m just some schmuck. Relevant XKCD: https://xkcd.com/538/

1. Compromise their endpoint with a malicious app on the app store.

2. Gain physical access to the device and compromise it. Use your imagination – pickpocket, traffic stop or customs inspection by a compromised agent, seduce them with a honeypot, etc.

3. Socially engineer them to mistakingly add you to their group chats.

4. SIM swap

Signal might be fine for journalists, criminals, cheating spouses, and general privacy when used properly with good OpSec but nation state adversaries have significantly greater resources than your average attacker, and thus require more significant security.