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By Enric Peig Olivé

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However, it is still used because many devices use WPA by default and users who do not have much knowledge about security are not aware of its weaknesses. 1. WEP In terms of integrity, it uses CRC32, or Cyclical Redundancy Checking, widely used in communications protocols. Encryption is done using the RC4 algorithm and two password systems have been proposed for authentication, the shared password and the open system. We will now look at these algorithms in more detail. The WEP standard provides integrity, encryption and identity authentication.

In fact, the intense activity taking place in this research field is constantly leading to the creation of new proposals for routing protocols and variations on existing ones. A couple of examples of routing protocols are: OLSR (Optimised Link State Routing Protocol) is one of the most widely used of the proactive protocols, and BATMAN (Better Approach To Mobile Adhoc Networking), which appeared fairly recently and was developed by Freifunk, a German initiative which supports the development of tools for open networks.

This is a network of servers that are usually located in privileged positions4 within an ISP and which all contain duplicate copies of the content being provided. When a client is connected to the content (4) In fact, the CDN nodes are installed in the ISP's data centres and connected directly to trunk lines. GNUFDL • PID_00164585 37 provider's server, this switches the connection to the CDN node that is closest to the client. This optimises the transmission speed and therefore minimises streaming degradation.

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