Encryption Mac -> Windows
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From: Wes Groleau on 30 May 2010 14:46 On 05-30-2010 04:37, David Ryeburn wrote: > This doesn't surprise me. However if you could use a Mac or PC belonging to > a friend who trusts you enough to let you install TrueCrypt, then you'd be If he's tgraveling and loses everything (see first paragraph of O.P.) then such a friend might not be available. > If you put unencrypted versions of your files inside the Public folder If the person that stole the computer leaves it online and if web sharing is enabled and (anything else?) > search, unlikely though that may be, is to encrypt the files in such a way > that you can decrypt them in your head. I wouldn't use ROT13, but something > not much more complicated than that would keep anyone or anything stumbling I'd like to meet the person who can decrypt a scan of a passport in his/her head. -- Wes Groleau New “Telenovelas” Web Page http://Ideas.Lang-Learn.us/russell?itemid=1032
From: David Ryeburn on 30 May 2010 17:37 In article <htubq8$f97$1(a)news.eternal-september.org>, Wes Groleau <Groleau+news(a)FreeShell.org> wrote: > On 05-30-2010 04:37, David Ryeburn wrote: > > This doesn't surprise me. However if you could use a Mac or PC belonging to > > a friend who trusts you enough to let you install TrueCrypt, then you'd be > > If he's tgraveling and loses everything (see first paragraph of O.P.) > then such a friend might not be available. > > > If you put unencrypted versions of your files inside the Public folder > > If the person that stole the computer leaves it online and if web > sharing is enabled and (anything else?) Stole *what* computer? Maybe you're talking about a different "Dropbox" from what I am talking about. The one I mean is available through www.dropbox.com. The unencrypted files when placed inside the Public folder using Dropbox are then (in addition to being on one's own home computer) on whatever computer the Dropbox people are making available for this service, ready for anyone in the world to copy, provided they can find their way to them. In order to do so they have to find the file. One of my files has the URL <http://dl.dropbox.com/u/abcdefg/FileName> where "abcdefg" is a seven-digit base-10 number and "FileName" is the name of the file. If you guess the wrong value of "abcdefg" you at most gain access to someone else's Dropbox file. If you guess the wrong value of "FileName" you either get nothing at all or the wrong file, the latter only if a file with your guessed name exists. If you omit "FileName" you get an error message, rather than access to my (or someone else's) entire Public folder. Yes, this is not optimum security but I think the chances of anything useful being found are slim. Ten million isn't all that large and is no protection against brute force. The number of choices for "FileName" is huge. One should not use short, obvious choices. David -- David Ryeburn david_ryeburn(a)telus.netz To send e-mail, use "net" instead of "netz".
From: Richard Maine on 30 May 2010 17:48 David Ryeburn <david_ryeburn(a)telus.netz> wrote: > <http://dl.dropbox.com/u/abcdefg/FileName> .... > Ten million isn't all that large and is no protection against brute force... But as you are using unsecured http, much easier than brute force is to just sniff your connection if you ever access the file. Your connection will have the url in the clear on it, as well as the contents of the file itself. -- Richard Maine | Good judgment comes from experience; email: last name at domain . net | experience comes from bad judgment. domain: summertriangle | -- Mark Twain
From: Wes Groleau on 30 May 2010 21:39 On 05-30-2010 17:37, David Ryeburn wrote: > Maybe you're talking about a different "Dropbox" from what I am talking > about. The one I mean is available through www.dropbox.com. The unencrypted Sorry. I had never heard about that. When you said "Public folder inside your Dropbox" what came to my mind was the "Dropbox inside your Public Folder" that each OS X user has on the Mac. -- Wes Groleau Some schools are cutting back on homework … http://Ideas.Lang-Learn.us/russell?itemid=1508
From: =?ISO-8859-1?Q?Kir=E1ly?= on 3 Jun 2010 16:10
BreadWithSpam(a)fractious.net wrote: > You still need the key if hte document is encrypted. > > Once it's been opened, with the key, some of the non-Adobe apps > will let you re-save it without restrictions or encryption. Thanks very much for that. I looked around and you are right. The PDF password defeaters can defeat user operation passwords - i.e. remove the printing or re-saving restrictions. But they can't defeat the main password required to actually open the file. This really is the best solution. I can encrypt the docs on my Mac, and decrypt them on Windows PC in any internet cafe or public library,, without having to install additional software in the PC. Just what I needed! -- K. Lang may your lum reek. |