Forbes put out an article on how Signal has some weaknesses using the after first unlock theory.TL;DR – Yes, but not limited to signal. Power off your phone if you are worried. 
 
 
 
<a href="https://www.forbes.com/sites/thomasbrewster/2021/02/08/can-the-fbi-can-hack-into-private-signal-messages-on-a-locked-iphone-evidence-indicates-yes/?sh=27331c526624">https://www.forbes.com/sites/thomasbrewster/2021/02/08/can-the-fbi-can-hack-into-private-signal-messages-on-a-locked-iphone-evidence-indicates-yes/?sh=27331c526624</a>

Forbes put out an article on how Signal has some weaknesses using the after first unlock theory.TL;DR – Yes, but not limited to signal. Power off your phone if you are worried. https://www.forbes.com/sites/thomasbrewster/2021/02/08/can-the-fbi-can-hack-into-private-signal-messages-on-a-locked-iphone-evidence-indicates-yes/?sh=27331c526624

Forbes put out an article on how Signal has some weaknesses using the after first unlock theory.TL;DR – Yes, but not limited to signal. Power off your phone if you are worried. 
 
 
 
<a href="https://www.forbes.com/sites/thomasbrewster/2021/02/08/can-the-fbi-can-hack-into-private-signal-messages-on-a-locked-iphone-evidence-indicates-yes/?sh=27331c526624" rel="noopener noreferrer">https://www.forbes.com/sites/thomasbrewster/2021/02/08/can-the-fbi-can-hack-into-private-signal-messages-on-a-locked-iphone-evidence-indicates-yes/?sh=27331c526624</a>

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Security – 260 – Forbes Signal Article

Security – 260 – Forbes Signal Article