WEP Encryption

Wired equivalent privacy (WEP) encryption is the ability of 802.11 to
create security that is analogous to that of wired networks. WEP uses
the RC4 algorithm to encrypt wireless transmissions. However, WEP
encryption does not cover end-to-end transmissions. It protects only the
data packet information, but not the actual physical layer that contains
the header. This means that other wireless stations on the network can
receive the control data necessary to manage the network. The general
idea is that other stations won’t be able to decrypt the data segments of
the packet.