Apparatus and a method are described for providing a security token. The security token may be used for numerous applications, but is particularly useful in conjunction with radiotelephone devices having secure functions. In accordance with the invention the user must insert a PIN and utter sounds. The...http://www.google.com.au/patents/US6084967?utm_source=gb-gplus-sharePatent US6084967 - Radio telecommunication device and method of authenticating a user with a voice authentication token
