1. A secure wireless data communications device for transmitting plain text in an encrypted message comprising cipher text and an initialization vector, the secure wireless communications device having associated therewith a media access controller (MAC) layer, the device comprising: a seed generator operable to perform a hashing algorithm to generate a seed using a secret key, a device address, and a changing reference value, the changing reference value comprising a MAC layer sequence number; a random initialization vector (IV) generator for generating a random IV; a key encrypter for generating a key sequence based upon the seed and the random IV; a logic circuit generating cipher text based upon the key sequence and plain text; and a wireless communications device connected to said logic circuit and said random IV generator for wirelessly transmitting the encrypted message comprising the cipher text and random IV.
5. The device of claim 1 wherein the key sequence comprises a plurality of bytes; and wherein said key encrypter deletes at least one byte from the key sequence prior to generation of the cipher text by said logic circuit.