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Re:Dropbox Lack of Security by gst on Tuesday April 19, 2011 @02:29AM (#2461850)
This system already exists.

* Wuala (using encryption but somewhat insecure deduplication)

* SpiderOak (using more secure deduplication: https://spideroak.com/blog/20100827150530-why-spideroak-does...)

Re:Dropbox Lack of Security by joanou on Tuesday April 19, 2011 @02:59AM (#2461883)
* AltDrive - client side deduplication.