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In the era of social media and messaging applications, people are becoming increasingly aware of data privacy issues associated with such apps. Major messaging applications are moving towards end-to-end encryption (E2EE) to give their users the privacy they are demanding. However the current security mechanisms employed by different service provide...
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Context 1
... to generate their backup decryption key using a known secret (e.g. a password). The backup data is stored on the user's Google Drive/iCloud/OneDrive etc. and encrypted by the backup key. When the user changes their device, they can download their backups from the cloud drive and decrypt them using their backup key generated from a known secret. Fig. 3 depicts the sequence diagram for the backup and restoration phases. Since the backup key is generated using the known secret, the user can re-generate it using the same process with the same known secret. If the user loses his/her backup key and also forgets the known secret there is no way to recreate the ...
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