Cryptology: Difference between revisions

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imported>Howard C. Berkowitz
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{{subpages}}
{{TOC-right}}
==Underlying principles==
{{r|Information theory}}
{{r|Random number}}
*Statistical characteristics of language
*Computationally intractable problems


==Methods of proving information is correct or has been transferred==
===Authentication===
====Sender authentication====
=====Digital signatures=====
=====Key management=====
*{{r|Public Key Infrastructure}}
*{{r|Pretty Good Privacy}}
====Server authentication====
===Nonrepudiation===
===Zero-knowledge proofs===
===Digital signatures===
==Confidentiality and integrity==
===Existence confidentiality===
===Traffic confidentiality===
===Message content confidentiality===
===Atomic and sequential integrity===
==Methods of concealing information==
===Cryptography===
*Ciphers and codes, including basic methods
*Symmetric, asymmetric, and both
*Key management protocols
====Specific cipher implementations====
=====Manual=====
*Monoalphabetic substitutions
*Polyalphabetic substitutions
**Straddling methods
*Transposition
*Superencipherment
=====Mechanical/Electromechanical=====
*Jefferson/Bazeries cylinder, strip ciphers
*Vernam
*Rotor and rotor-like: Hagelin, Enigma, Purple, SIGABA/Typex
=====Computer (general purpose and chip) implementations=====
*General characteristics of military (KG vs KW, etc.)
*Non-text/data: secure voice, video, fax
*DES
*PGP
*AES
===Steganography===
*Invisible ink methods?
*Classic covert channel
*Masking with graphics
*Spread spectrum, frequency agility, {{seealso|electronic warfare))
===Hybrid methods===
==Methods of obtaining partial or full information==
{{seealso|communications intelligence}} for things including [[traffic analysis]] and [[direction finding]]
*Man-in-the-middle attack
*Various general scenarios: brute force, chosen plaintext
*Basic mathematical cryptanalysis: frequency analysis, index of coincidence, Kappa test
*Advanced mathematical cryptanalysis
*Red/black engineering and other COMSEC supporting measures {{seealso|communications intelligence}}
*"Practical cryptanalysis" (black bag job), [[radiofrequency MASINT#Unintentional Radiation MASINT]] (TEMPEST/Van Eck, etc.), acoustic cryptanalysis
*"rubber hose cryptanalysis"
**"This is the most powerful handgun in the world. I can't remember if I've fired five or six times. Feeling lucky, punk?" This is an example of quantum cryptanalysis, with the .44 Magnum chamber is loaded or not loaded, but Heisenberg requires one pull the trigger to find out.

Revision as of 21:53, 27 September 2008

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