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Informational Constraints (idea)
See all of Informational Constraints
, no other writeups in this node.
(
idea
)
by
ink-
Sun Dec 16 2001 at 5:50:44
Informational constraints
in
cryptography
will tell us the path we will take when we are attacking a certain
cipher
or
ciphertext
.
Ciphertext Only
: We have only
ciphertext
to work with. Sometimes the
statistics
of the
ciphertext
provide
insight
and can lead to a
break
. Other times, perhaps due to a good
avalanche effect
of the
cipher
, we will gain more from looking at
/dev/random
.
Known Plaintext
: We have some, or even an extremely large amount, of
plaintext
and the associated
ciphertext
. <\li>
Defined Plaintext
: We can submit
arbitrary
messages to be ciphered and capture the resulting
ciphertext
. <\li>
Defined Ciphertext
: We can submit
arbitrary
messages to be deciphered and see the resulting
plaintext
. <\li>
Chosen Key
: We can specify a change in any particular
key
bit
, or some other relationship between
keys
. <\li>
Timing
: We can measure the
duration
of ciphering operations and use that to reveal the
key
or
plaintext
. <\li>
Differential Fault Analysis
: We can induce
random faults
into the ciphering
machinery
, and use those to expose the
key
. <\li>
Man in the Middle
: We can
subvert
the
routing
capabilities of a
computer network
, and pose as the other side to each of the communicators. (Usually a
key
authentication attack on
public key
systems
.)<\li>
Man In The Middle
Voynich Manuscript
all-or-nothing transform
Completeness Effect
known plaintext attack
ciphertext
/dev/random
Avalanche Effect
chosen plaintext attack
directed graph
plaintext
timing
public key
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