The Silk cloud browser on Amazon's new Kindle Fire tablet device has been under strict scrutiny because of the security concerns of Amazon tracking and saving users' browsing history. The tablet stores certain history data on Amazon's servers so that web pages, especially ones already visited, load faster. Overall, running through Amazon's cloud servers and using a SPDY protocol is much faster than using full HTTP protocols.
Amazon has finally come out and defended the Silk browser by offering detailed information about how the data collected by the Silk browser is used.
First of all, Amazon asserts that no secure communications – personal data, credit card info, etc. – are stored on Amazon's system. Any HTTPS protocol (used in most secure communications) are kept off the Amazon cloud.
Further, according to Amazon, only three pieces of data are stored in the SPDY protocol – the requested URL, the timestamp of the request, and a session token. In addition, that information is only kept for 30 days.
Finally, the SPDY protocol is well-encrypted to prevent any third-parties from accessing or manipulating the stored data.
This may not be the end of the Silk browser investigation, but Amazon's clarification does yield additional information about how this new browser technology works.