Security Basics mailing list archives
Re: splited file encrypted with blowfish secure?
From: Roscoe <eocsor () gmail com>
Date: Sat, 8 Nov 2008 14:09:41 +1300
On Wed, Nov 5, 2008 at 6:32 AM, Andre Pawlowski <sqall () h4des org> wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I have a question about the security of my encryption. I have written a program in php which splits a file in small parts, encrypts each of them with blowfish and put it together. It uses the same key for every encryption of the parts. The reason I do it like this is that php is only allowed to use 16MB of memory space and so it cannot encrypt or decrypt large files.
I've never written anything in PHP here so I might be way off...But a 16MB memory limitation would only stop you from reading the entire file into memory at once. The way I'd do would be to read/encrypt/write N blocks at a time. [This is similar in principle to what you're doing, except without the need for separate files or reinitialization of the block cipher mode.] -- Roscoe
Current thread:
- splited file encrypted with blowfish secure? Andre Pawlowski (Nov 04)
- Re: splited file encrypted with blowfish secure? Ansgar Wiechers (Nov 04)
- Re: splited file encrypted with blowfish secure? Shreyas Zare (Nov 05)
- Re: splited file encrypted with blowfish secure? Roscoe (Nov 10)
- <Possible follow-ups>
- Re: splited file encrypted with blowfish secure? Andre Pawlowski (Nov 12)
- Re: splited file encrypted with blowfish secure? Sam Stelfox (Nov 24)
- Re: splited file encrypted with blowfish secure? Ansgar Wiechers (Nov 04)