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Re: Encrypted storage with streaming (OpenSSL, AES) [message #25763 is a reply to message #25762] |
Wed, 10 March 2010 21:33 |
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koldo
Messages: 3358 Registered: August 2008
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Senior Veteran |
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kohait00 wrote on Wed, 10 March 2010 20:54 | hi koldo,
as far as i got the point of mindtraveler, AES and the other symetric algorithms are not to be thought of beeing based on a "password", a user defined and therefore week combination of signs (which would be scanned first in a brute force attack), but on a statistically well distributed *binary* key (128 bit should be made wise . it is hard for a human beeing to generate one. so the computer will take over and provide some random ones(AES key generator). this key should be thought of as a "password", what it of corse isn't. everything else would diminish the stability of the key.
maybe to get over it, think of it as kind a GUID which you generate once for your application (which in real world communication does not apply . dont think of AES as sort of alphanumerical password dependant encryption algorithm, it's indeed, just as mindtraveler mentioned: math. i had the luck to enjoy some lectures cryptology, and it confuses sometimes. but the first thing we learned there was to forget the idea of passwords / human readable strings as security base.
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Yes yes, all of you are right
However think about for example a file encrypting software to be used by different people. How would you do it ?
Option 1: The software gives the user a 32 bytes random key
Option 2: The user enters a key
Option 1 seems much stronger. However file and hard disk encrypting software seems to choose option 2.
Best regards
IƱaki
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Encrypted storage with streaming (OpenSSL, AES)
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