1. A method comprising: receiving, from a user of a speech verification system, a plurality of speech samples of a same word; generating, via a processor, a sample similarity from the plurality of speech samples; making a decision, via the processor, whether to enroll the user in the speech verification system according to a comparison of the sample similarity with a threshold, wherein the decision is a first decision if the sample similarity is above the threshold and the decision is a second decision different from the first decision if the sample similarity is below the threshold; and enrolling the user in the speech verification system if and only if the second decision is made.