On Sun, Sep 1, 2013, at 17:50, Clemens Ladisch wrote: > Ulrich Telle wrote: > > Am 31.08.2013 22:01, schrieb Etienne: > >> I simply wanted to warn the OP that wxSQLite, while free, does NOT use > >> salts: > > > > Well, that's not completely true. The encryption extension coming with > > wxSQLite3 uses a different IV (initial vector) for each database page. > > True is that the IVs are not random, but deduced from the page number. > > However, I don't see much difference between generating an IV > > algorithmic or using a random nonce which is stored at the end of each > > database page > > <http://en.wikipedia.org/wiki/Initialization_vector> says: > | Randomization is crucial for encryption schemes to achieve semantic > | security, a property whereby repeated usage of the scheme under the > | same key does not allow an attacker to infer relationships between > | segments of the encrypted message. > > Without a random IV/nonce, every page is guaranteed to encrypt to the > same data if the contents and the key have not changed. Thus, wxSQLite3 > gives an attacker the ability to determine whether any particular page > has changed, by comparing the old and new versions. With SEE, rewriting > a page will encrypt to a different value because the IV changes even for > otherwise unchanged pages. > > > The weak point of probably all SQLite encryption methods is that the > > unencrypted content of the first 16 bytes of a SQLite database file is > > well known. > > Many file formats have fixed parts. However, this is not a problem with > properly implemented encryption algorithms. > > Regards, > Clemens
Amen. In this particular case, you get what you pay for. Regards, Etienne _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
