Key size is not the only major security limitation in WEP.[9] Cracking a longer key requires interception of more packets, but there are active attacks that stimulate the necessary traffic.

• WEP 不是强制使用的，使得许多设施根本就没有启动 WEP；以及WEP 并不包含钥匙管理协定，郤依赖在用户间共用一个秘密钥匙。