Re: DES decrpytion tools

From: Kevin Drapel (kevin.drapel_at_epfl.ch)
Date: 02/28/05 

Date: Mon, 28 Feb 2005 13:50:26 +0000

efenner wrote:
> Hello,
>
> I am looking for a shareware or freeware tool that uses standard DES
> implementation. I need the tool to accept an image that has been
> encrypted by DES. The tool should be able to take as input a user
> specified key, which will then be used to decrypt the file.
>
> Any help or pointers would be really useful.

You have to consider the mode of encryption too. DES is a block cipher
but to encrypt a file with more than 64 bits, you have to convert it
into a stream cipher with modes of encryption (ECB, CBC, etc.), ie. a
way to connect more than one DES blocks together

Relevant Pages

  • Block cipher security - deterministic systems problem
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    (sci.crypt)
  • 3DES and super-encryption
    ... I'm basically familiar with 3DES and how it was developed to extend the ... short version of what I know about the transition from DES ... DES is basically a secure cipher except that with 56 bit keys it is ... adds nothing to the strength of encryption but may actually weaken a cipher. ...
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  • Re: DES and UUEncoded
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    (microsoft.public.dotnet.security)
  • Cryptography FAQ (05/10: Product Ciphers)
    ... What makes a product cipher secure? ... What exactly is DES? ... Let E_Kbe the encryption of X under key K. Then, for any fixed K, ...
    (sci.crypt)
  • Cryptography FAQ (05/10: Product Ciphers)
    ... What makes a product cipher secure? ... What exactly is DES? ... Let E_Kbe the encryption of X under key K. Then, for any fixed K, ...
    (sci.crypt)