Re: a few questions about AES


Antony Clements wrote:


i'm having a really hard time pinning down the strength of the algorithm. a
512 character string has 4096 bits in it, but according to my calculations
(not very good at exponent math) the possible combinations within those 4096
bits is something along the mark of 1.0443^1233 possible keys.

You're confusing the length of your key with the strength of your
cipher. Those two things are not the same. A cipher might have
enormously long keys, with incalculable numbers of combinations - and
yet be trivially breakable.

It's like saying: "My car has four doors, therefore it will travel at
least 100 mph". The second part of that statement does not follow from
the first. Simiarly, cipher strength does not necessarly follow (at
all) from having long keys.

HTH,
TC (MVP MSAccess)
http://tc2.atspace.com

.

Relevant Pages

  • Re: =?windows-1252?Q?The_Renaissance_is_Here_=96_SD_cryptography=2E?=
    ... cipher in itself. ... alphabet later to create keys ad hoc, ... All modern cryptography depends on going public with the vitally ... Even RSA and other public-key algorithms do not ...
    (sci.crypt)
  • Re: Initializing GFSR Generators.
    ... It is important to see the system around "the cipher" ... I innovated an "alias file" to hold the actual keys, ... somebody has to get through a combiner ...
    (sci.crypt)
  • Re: Should be in crypto for John E. Hadstate Re: just stupid?
    ... >>authority error? ... > doubt that Shannon would call himself a cipher designer. ... >>conventional block ciphers, some keys could ... > We are not talking about analyzing each key; ...
    (sci.crypt)
  • RE: Kryptor Whitepaper released
    ... 16 bytes you have a monoalphabetic substitution cipher). ... manipulations of the keys, but not much more difficult though). ... Bruce Schneier regarding the simple XOR algorithm ...
    (Focus-Linux)
  • Re: Triple AES (3AES)
    ... technology, not meerly larger keys. ... You mean "The Aryabharata Cipher, and Two-Timing Pads"? ... at all the rounds of the block cipher as a bunch of math, ...
    (sci.crypt)