It is safer to use 3-DES than single Des because we use a 128-bit key
instead of a 64-bit key, so the number of possible keys is much bigger. Also
it has been reported that a method called 'match in the middle' could
penetrate the single -DES but not the 3-DES.
-----Original Message-----
From: Jeffrey Altman <[EMAIL PROTECTED]>
To: Johan Danielsson <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED] <[EMAIL PROTECTED]>;
[EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Tuesday, November 23, 1999 4:24 PM
Subject: Re: Last Call: Telnet Authentication Option to Proposed Standard
>> Jeffrey Altman <[EMAIL PROTECTED]> writes:
>>
>> > You are questioning the use of Triple DES but not the use of
>> > CAST-128.
>>
>> I'm questioning the use of DES3 in anything but EDE on outer CBC
>> mode. There is a paper by Eli Biham about other combinations, which
>> basically says that most of them are not much better than single DES.
>>
>> Even though this paper doesn't talk about this specific use, it's not
>> obvious that it's more secure to use DES3 to generate random numbers
>> than it is to use single DES.
>>
>> Has this case been analysed by anyone?
>>
>> /Johan
>>
>
>Thanks for explaining. The answer is that I don't know. I am not
>qualified to make that analysis.
>
>
> Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
> The Kermit Project * Columbia University
> 612 West 115th St #716 * New York, NY * 10025
> http://www.kermit-project.org/k95.html *
[EMAIL PROTECTED]
>
>
>
Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
The Kermit Project * Columbia University
612 West 115th St #716 * New York, NY * 10025
http://www.kermit-project.org/k95.html * [EMAIL PROTECTED]
