WEP is a security algorithm for IEEE 802.11 wireless networks. Introduced as part of the original 802.11 standard ratified in September 1999, its intention was to provide data confidentiality comparable to that of a traditional wired network. It recognizable by the key of 10 or 26 hexadecimal digits, Source wiki.

Two methods of authentication can be used with WEP, Open System authentication and Shared Key authentication.

There a various technic that we can use to break a key depend a type of password. If it use a combination of letter, number, symbol, it will take long time o break it.