Why Adding Client-Side Scanning Breaks End-To-End Encryption

    Date08 Nov 2019
    CategoryCryptography
    641
    Posted ByBrittany Day
    Keys Crossed Pink Starburst

    Recent attacks on encryption have diverged. On the one hand, we’ve seen Attorney General William Barr call for “lawful access” to encrypted communications, using arguments that have barely changed since the 1990’s. But we’ve also seen suggestions from a different set of actors for more purportedly “reasonable” interventions, particularly the use of client-side scanning to stop the transmission of contraband files, most often child exploitation imagery (CEI). What are your thoughts on client-side scanning and its privacy implications? Learn more in a great EFF article:

    Sometimes called “endpoint filtering” or “local processing,” this privacy-invasive proposal works like this: every time you send a message, software that comes with your messaging app first checks it against a database of “hashes,” or unique digital fingerprints, usually of images or videos. If it finds a match, it may refuse to send your message, notify the recipient, or even forward it to a third party, possibly without your knowledge.

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