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E-Commerce and E-Business

6. Subject Name: It is the subject containing the X.500 name of the owner of the corresponding
private key.

7. Subject Public Key Information: It defines the key value and the algorithm to be used while
encrypting with the public key.
8. Issuer Unique Identifier: It is used for unique identification of the CA (not in version 1).
9. Subject Unique Identifier: It is used for unique identification of the subject (not in version 1).

Figure 6.6: Versions 1 and 2 of the X.509 Certificate
Format

Source: Bajaj. K., Nag. D. (1999). E-Commerce Security Issues. New Delhi: Tata McGraw-Hill Publishing Company
Limited. Page 214.

Version 1 of X.509 certificate was developed in the year 1988 and version 2 was
developed in the year 1993. Initially, when the trial version was launched and used in
the year 1993—94, it was found that X.509 was deficient in supporting multiple
certificates for an individual user. It also lacked to identify users by any other means
other than X.500 name for example, e-mail address. In order to overcome this issue,
version 3 was developed. The new version contained extension fields along with the
information contained in version 2 of the X.509 certificate format.

6.3 E-Cash over the Internet
Electronic cash also known as e-cash is an advanced technology of making cash payments over the
Internet.

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