9. The speech-based speaker recognition system of claim 8 , wherein the passphrase recognition module comprises a passphrase comparison engine to compare the test passphrase to the reference passphrase to determine whether the test passphrase matches the reference passphrase.
10. The speech-based speaker recognition system of claim 9 , wherein the passphrase comparison engine comprises a passphrase match scoring module to determine a score based on similarity between the test passphrase and the reference passphrase, and wherein the passphrase comparison engine determines whether the test passphrase matches the reference passphrase based on the score.