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Explain in detail the types of user authentication
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AUTHENTICATION

  • It is a process of identifying an individual and ensuring that the individual is the same who she/he claims to be.
  • User authentication is the basis for most types of access control and for user accountability.

Access Control: It is the selective restriction of access to a place or other resource.



TYPES OF AUTHENTICATION

1.BASIC AUTHENTICATION

  • In the context of an HTTP transaction,basic access authentication is a method for an HTTP user agent (eg:a web browser) to provide a username and password when making a request.
  • In basic HTTP authentication,a request contains a header field in the form of Authorization:Basic < credentials >,where credentials is the Base64 encoding of ID and password joined by a single colon:

2.CERTIFICATE BASED AUTHENTICATION

  • It is the use of a Digital Certificate to identify a user,machine,or device before granting access to a resource,network,application,etc.
  • It is stronger compared to password authentication.
  • Digital certificates can then be reused for user authentication

3.BIOMETRIC AUTHENTICATION

  • A process which uses the distinct biological or physiological characteristics of users to verify their requests.
  • It is based on human characteristics like fingerprint,voice,patterns of lines in iris.
  • It is based on two parameters:

    (i) False Accept Ratio: Measure of a chance that a user who should be rejected is accepted by the system.

    (ii) False Reject Ratio:Measure of a chance that a user who should be accepted is rejected by the system.


4.E-token based authentication

  • An authentication token is a small device that generates a new random value every time it is used.This random value becomes the basis of authentication.
  • It is an alternative to passwords.
  • It can be implemented on a USB key or a smart card.
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