Cryptology: Difference between revisions

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imported>Sandy Harris
imported>Sandy Harris
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*Red/black engineering and other COMSEC supporting measures {{seealso|communications intelligence}}
*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
*"Practical cryptanalysis" (black bag job), [[radiofrequency MASINT#Unintentional Radiation MASINT]] (TEMPEST/Van Eck, etc.), acoustic cryptanalysis
*"rubber hose cryptanalysis"

Revision as of 22:33, 4 August 2008

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Underlying principles

  • Information theory
  • Random numbers
  • Statistical characteristics of language
  • Computationally intractable problems

Methods of proving information is correct or has been transferred

Authentication

Sender authentication

Digital signatures
Key management
  • PKI
  • PGP

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

See also: 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
See also: communications intelligence