Cambridge IGCSE ICT Study and Revision Guide (Igcse Study Guides) by Graham Brown & David Watson

Author:Graham Brown & David Watson [Brown, Graham]
Language: eng
Format: azw3
ISBN: 9781471890352
Publisher: Hodder Education
Published: 2017-09-18T04:00:00+00:00

Protocols

There are two common protocols which are used when a computer wishes to communicate across a network: SSL (secure socket layer) and TLS (transport layer security).

SSL – when a user logs on to a website, SSL encrypts the data; the user will know if SSL is being applied due to https or the green padlock appearing; it involves a communication between the web browser on the user’s computer and the website.

TLS – this is similar to SSL but is more modern and more effective; it uses two layers known as the ‘record protocol’ (which contains the data being transferred) and the ‘handshake protocol’ (which permits website and user to authenticate each other).

The basic differences between SSL and TLS are that TLS can be extended by adding new authentication methods, TLS can make use of ‘session caching’ and TLS separates the two protocol layers.

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