For information :

http://css.csail.mit.edu/cryptdb/
http://dspace.mit.edu/handle/1721.1/60876

>From the front page :

Online applications are vulnerable to theft of sensitive information
because adversaries can exploit software bugs to gain access to private
data, and because curious or malicious administrators may capture and
leak data. CryptDB is a system that provides practical and provable
confidentiality in the face of these attacks for applications backed by
SQL databases. It works by executing SQL queries over encrypted data
using a collection of efficient SQL-aware encryption schemes. CryptDB
can also chain encryption keys to user passwords, so that a data item
can be decrypted only by using the password of one of the users with
access to that data. As a result, a database administrator never gets
access to decrypted data, and even if all servers are compromised, an
adversary cannot decrypt the data of any user who is not logged in. An
analysis of a trace of 126 million SQL queries from a production MySQL
server shows that CryptDB can support operations over encrypted data for
99.5% of the 128,840 columns seen in the trace. Our evaluation shows
that CryptDB has low overhead, reducing throughput by 14.5% for phpBB, a
web forum application, and by 26% for queries from TPC-C, compared to
unmodified MySQL. Chaining encryption keys to user passwords requires
11-13 unique schema annotations to secure more than 20 sensitive fields
and 2-7 lines of source code changes for three multi-user web applications.



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