On Tue, 31 Jul 2012 22:36:12 +0800 Robert Siemer <robert.siemer-li...@backsla.sh> wrote: | | | On 31/07/12 15:48, Anthony Thyssen wrote: | > On Tue, 31 Jul 2012 11:52:32 +0530 | > SaNtosh kuLkarni <santosh.yesop...@gmail.com> wrote: | | > Each filename is encrypted than a checksum prepended. This is then | > converted to a base64 encoding (ascii) and the characters '.' (which | > can make a file hidden), and '/' (one of the 2 illegal characters in a | > filename, NUL being the other) replaced with ',' and '-' respectively. | | Base64 only contains letters and numbers (together 62) and two more | configurable characters (to get to 64 total). – There is no need to | replace NUL or ‘/’ afterwards (unless base64 is configured stupid). | | | Regards | I just pointed out that NUL and '/' can not be used in filenames (under UNIX) and '.' can hide files if it it the first character. as the STANDARD base64 encoding uses '.' and '/' the EncFS replaces those characters.
NUL is not a problem, but the other two are. Basically, EncFS uses a modified base64 encoding to convert the encrypted filenames and checksum (binary) to valid filename. It is a useful technique which I also used for other things (but using one-way hashes rather than reversible encryption). There is another modified base64 encoding used for URL's, replacing '+' and '/' with '-' and ',' respectively. Anthony Thyssen ( System Programmer ) <a.thys...@griffith.edu.au> -------------------------------------------------------------------------- "Better shut 'er down, Slim. She's pumpin' mud." - memorable error message! -------------------------------------------------------------------------- Anthony's Castle http://www.ict.griffith.edu.au/anthony/ ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Encfs-users mailing list Encfs-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/encfs-users
