Re: Decrypting 3DES files

From: Tom St Denis (tom_at_securescience.net)
Date: 06/23/04 

Date: Tue, 22 Jun 2004 23:01:53 GMT

Isaack Rasmussen wrote:

> I have locked up my files with Windows 2003's EFS system. I believe it
> uses 3DES to encrypt the files.
>
> Are any of you aware of tools that can decrypt with the help of known
> contents from the encrypted files?
>
> For example, I know at least the first 50+ bytes, as I have an older
> version of the file. It's plaintext if it matters.

You mean it's text right? plaintext means the normal state of information
[e.g. a playable mp3 is plaintext].

As for the query in general, if there is a break for 3DES you'll be the
first person I tell ok? ;-)

Tom

Relevant Pages

  • Re: Extreme Porn - Hiding your Stash ?
    ... data that we want to encrypt. ... being XORed with the plaintext. ... the breaking of the German Lorenz cypher ... this was because the obscuring characters weren't as random as ...
    (uk.legal)
  • Re: Matrixview SWISH almost two times better compression then GZIP and much faster
    ... like open source, chosen plaintext, lots of computing power. ... the ciphertext was encrypted with ME6 -- or simply encrypt the ME6 ... computing power and lots of crypto experts to help. ... If ME6 can't withstand such an attack, ...
    (comp.compression)
  • Re: Streambuddy
    ... the plaintext for a small portion of the file (the magic number in the ... You get a file and 40-bit secret key to encrypt it. ... if you're actually just XOR'ing the pseudo random stream with the ... much you mix internally the key and how much internal state you have. ...
    (sci.crypt)
  • Re: ADVERT: Secure communications.
    ... >So if I use RC4 with the following precautions to encrypt a small ... >amount of plaintext, it should be quite secure, right? ... >Assuming I'm encrypting very small amounts of plaintext, ... attack... ...
    (sci.crypt)
  • Re: "incrementing" ecb mode
    ... >> to encrypt the crc. ... The crc is a crc of the plaintext, ... If they can stick chosen plaintext into the file, ... >> cipher used to encrypt the plaintext. ...
    (sci.crypt)