Home page logo
/

basics logo 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


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault