Micah Lee 🫡

@micahflee ↗

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Last Checked June 11, 2020

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Tue May 26 22:47:53 +0000 2020

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Micah Lee 🫡 @micahflee

As people leave and join the meeting, the shared meeting key gets rekeyed. So if you join for a second, get the key, then leave/get kicked out, you can’t spy on the rest of the meeting (assuming you can observe the network) https://t.co/ETC4dMBeom — PolitiTweet.org

Posted May 26, 2020

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Micah Lee 🫡 @micahflee

Each device has a keypair, but additionally each time you join a meeting you generate a new ephemeral keypair just for that meeting, signs it with their long term keypair. This is what’s used to encrypt the meeting’s symmetric session key for each participant https://t.co/2wYTTOAjWy — PolitiTweet.org

Posted May 26, 2020

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Micah Lee 🫡 @micahflee

Nice. When you leave a meeting, your client destroys all ephemeral keys used during the meeting to provide “forward secrecy” — an attacker that records an encrypted meeting can’t later decrypt it after stealing keys from a device https://t.co/0sfIXmIy9g — PolitiTweet.org

Posted May 26, 2020