Re: splited file encrypted with blowfish secure?

[Roscoe <eocsor () gmail com>]

On Wed, Nov 5, 2008 at 6:32 AM, Andre Pawlowski <sqall () h4des org> wrote:
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> 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