Apple has fixed a bug that could cause parts of Signal notifications to remain stored on iPhones even after messages disappeared and the app was deleted. "Affected users concerned about push notifications can update their devices to stop what Apple characterized as 'notifications marked for deletion' that 'could be unexpectedly retained on the device,'" reports Ars Technica. "According to Apple, the push notifications should never have been stored, but a 'logging issue' failed to redact data." From the report: Vulnerable users hoping to evade law enforcement surveillance often use encrypted apps like Signal to communicate sensitive information. That's why users felt blindsided when 404 Media...