Cryptology: Difference between revisions
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imported>Sandy Harris (→Methods of obtaining partial or full information: rubber hose) |
imported>Howard C. Berkowitz (Heisenberg's cat's revenge) |
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*"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" | *"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 22:25, 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
- "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.