Re: Why is AES more secure than DES??
From: Bill Unruh (unruh_at_string.physics.ubc.ca)
Date: 04/30/03
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Date: 30 Apr 2003 15:31:44 GMT
"Yuen" <Yuen@123.com> writes:
]> But it has a password of 128 bits, not 56 bits. No speedup can
]> compensate for a 10^22 increase in the number of passwords to search
]> through.
]But in the case of a brute force attack which proceeds through all possible
]combinations of legal characters in sequence, a longer key doesn't make much
]difference.
]What I mean is "not" guess the key, but like this:
]"mypassword123" --> hash data (key), as input key --> encryption (with
]plaintext) -> ciphertext
]guessing
]"AAAAAAAAAAA"
]"AAAAAAAAAAB"
]"AAAAAAAAAAC"
]...
And why 11 characters? After all 128 bits corresponds to either 16 or 18
characters.So, you want
AAAAAAAAAAAAAAAA
etc and remember to use non-alphabetic characters as well. And if the
other side does it properly and hashes the text first then it could be
even longer.
So figure out for yourself how long it would take to cycle through all
of the possibilities.
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