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2 changes: 1 addition & 1 deletion exercises/chat-app.md
Original file line number Diff line number Diff line change
Expand Up @@ -318,7 +318,7 @@ _NOTE: Ensuring a proper message order is a [tricky problem](https://www.addicti
> **Candidate**: "Additionally, the **user perception** of privacy is as important as the privacy implementation itself. If the developer has the access to the messages - the customers might assume that those messages would be read without any consent."
> **Candidate**: "An end-to-end encryption could be used but I don't have any experience with the algorithms for key exchange."

_NOTE: For more information about messaging privacy check [WhatsApp Encryption Overview](https://scontent.whatsapp.net/v/t39.8562-34/122249142_469857720642275_2152527586907531259_n.pdf/WA_Security_WhitePaper.pdf?ccb=1-5&_nc_sid=2fbf2a&_nc_ohc=TUznIG51RtgAX_Lf8cM&_nc_ht=scontent.whatsapp.net&oh=01_AVz_bi984XEgdXSXsCXBbC5mwFHGq4t2v5CRSJ8UiUHqFg&oe=61BC4F59)._
_NOTE: For more information about messaging privacy check [WhatsApp Encryption Overview](https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf)._

## Conclusion
Keep this in mind while preparing for a system design interview:
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