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_lqaf
on Aug 5, 2021
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Apple enabling client-side CSAM scanning on iPhone...
Not POTS, but cell phones could have been E2E at least since cellular switched to digital.
gruez
on Aug 5, 2021
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The first digital phones ran on 56 bit (symmetric?) encryption. They certainty weren't powerful enough to run public key cryptography at safe key sizes, which is needed for secure e2e.
_lqaf
on Aug 6, 2021
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Not at key sizes considered safe today, but 384 bit RSA was considered secure for some uses around then.
The RSA-155 Challenge (512 bits) was not beaten until 1999.
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