#2691: Encryption
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Transcript
[Cueball showing a phone to a long-haired woman, identified in the caption as Alice]
Cueball: The app will let you send messages to your friend Robert, or my brother.
Alice: Can they reply?
Cueball: No.
[Caption below the panel]:
My new secure texting app only allows people named Alice to send messages to people named Bob.
(Sourced from explainxkcd.com)
Title text:WARNING: PEOPLE NAMED EVE ARE PROHIBITED FROM INSTALLING THIS APP!