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Information Security PowerPoint PPT Presentation


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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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Information Security

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Information security l.jpg

Information Security


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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


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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


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Services, Mechanisms, Algorithms

A typical security protocol provides one or more services

•Services are built from mechanisms

•Mechanisms are implemented using algorithms


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Conventional Encryption

  • Uses a shared key

  • Problem of communicating a large message in secret is

  • reduced to communicating a small key in secret


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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


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Key Agreement

  • Allows two parties to agree on a shared key

  • Provides part of the required secure channel for exchanging a conventional encryption key


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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


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MAC’sMessage Authentication Code, adds a password/key to a hashOnly the password holder(s) can generate the MAC


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Digital SignaturesCombines a hash with a digital signature algorithm


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Signature checking:


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Message/Data EncryptionCombines conventional and public-key encryption.


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Public-key encryption provides a secure channel to exchange conventional encryption keys


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


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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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