On Thu, May 07, 2015 at 11:36:49 CEST, Fraser Scott wrote: > On 7 May 2015 at 10:29, Arno Wagner <arno@xxxxxxxxxxx> wrote: [...] > Yeah. I've got some limitations as to where I can keep a 400GB file, so for > now I'll just work with a hundred meg or so. Once I can strings that to get > what looks like a file system, I'll apply the code to the whole image. Just get a 1TB or larger external USB disk. They are not expensive. And probably a lot cheaper than your wive's wrath of you accidentally kill the original disk. Firts rule of all data-recovery: Never work on the original, always on a copy. And if the data has any worth, make two backups and only work on one. > Just one remark: Your terminology seems to be off, as ECB does not > > have an IV. I suggets using the formula from Wikipedia directly and > > to forget about "IV"s. > > > > What I meant was I was using openssl's AES in ECB mode as a building block > for doing LRW myself. So I was doing something like E_k(tweak(IV, sector)) > ^ tweak(IV, sector) with ECB providing E_k. Ok. The thing is though that "ECB" is a "mode" while E_k is one elementary encryption op. ECB means encryting b0,b1,b2 as E_k(b0),E_k(b1),E_k(b2). For just one block, they are the same, but the term "mode" does not make sense for just one block. Not trying to be a smart-ass, but people will understand you better with the right terminology. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
