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Information Security . Information Security Requirements. Confidentiality: •Protection from disclosure to unauthorised persons Access control: Unauthorised users are kept out Authentication: Assurance of identity of person or originator of data

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PowerPoint Slideshow about 'Information Security' - edda


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Presentation Transcript
information security requirements
Information Security Requirements
  • Confidentiality: •Protection from disclosure to unauthorised persons
  • Access control: Unauthorised users are kept out
  • Authentication: Assurance of identity of person or originator of data
  • Non-repudiation: Protects against the originator ofcommunications later denying it
  • Availability: Legitimate users have access when they need it
  • Integrity: Maintaining data consistency. Protects from unauthorised data alteration
security threats
Security Threats
  • Information disclosure/information leakage
  • Integrity violation
  • Masquerading
  • Denial of service
  • Illegitimate use
  • Generic threat: Backdoors, trojan horses, insider attacks
  • Most Internet security problems are access control or authentication types
  • Denial of service is also popular, but mostly an annoyance
services mechanisms algorithms
Services, Mechanisms, Algorithms

A typical security protocol provides one or more services

•Services are built from mechanisms

•Mechanisms are implemented using algorithms

conventional encryption
Conventional Encryption
  • Uses a shared key
  • Problem of communicating a large message in secret is
  • reduced to communicating a small key in secret
public key encryption
Public-key Encryption
  • Uses matched public/private key pairs
  • Anyone can encrypt with the public key, only one person
  • can decrypt with the private key
key agreement
Key Agreement
  • Allows two parties to agree on a shared key
  • Provides part of the required secure channel for exchanging a conventional encryption key
hash functions
Hash Functions
  • Creates a unique “fingerprint” for a message
  • Anyone can alter the data and calculate a new hash value
  • Hash has to be protected in some way
slide9
MAC’sMessage Authentication Code, adds a password/key to a hashOnly the password holder(s) can generate the MAC
slide14

Data FormatsOne obviously-correct format for secured content allows straightforward one-pass processing for encapsulation and decapsulation

security protocol layers
Security Protocol Layers

The further down you go, the more transparent it is

The further up you go, the easier it is to deploy

Ref:

http://www.cs.auckland.ac.nz/~pgut001

http://www.cs.auckland.ac.nz/~pgut001/tutorial/index.html

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