7. A system comprising: an audio input to receive speech from a user, the speech including ambient noise proximate the user; a speech processor coupled to the audio input to generate a phrase containing user distinguishing phonemes as a function of an associated score indicative of a magnitude by which pronunciation of the distinguishing phonemes differs from that of an average user, wherein the associated score includes an ambient noise score such that the phrase has discriminability from the ambient noise, wherein the speech processor generates the phrase by searching for a phrase in a library that contains user distinguishing phonemes, and wherein the associated score is adjusted based on a difference of the pronunciation from ambient noise, resulting in a different generated phase in the presence of the ambient noise.
7. A system comprising: an audio input to receive speech from a user, the speech including ambient noise proximate the user; a speech processor coupled to the audio input to generate a phrase containing user distinguishing phonemes as a function of an associated score indicative of a magnitude by which pronunciation of the distinguishing phonemes differs from that of an average user, wherein the associated score includes an ambient noise score such that the phrase has discriminability from the ambient noise, wherein the speech processor generates the phrase by searching for a phrase in a library that contains user distinguishing phonemes, and wherein the associated score is adjusted based on a difference of the pronunciation from ambient noise, resulting in a different generated phase in the presence of the ambient noise. 11. The system of claim 7 and further comprising a library of phrases stored on a computer readable storage device, and wherein the speech processor generates the phrase by searching for a phrase in the library that contains user distinguishing phonemes.