An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: based on at least one utterance of a pass-phrase (201, 202, 203) and predetermined scoring information comprising predetermined linguistic-element-scores attributable to one or more linguistic elements that form at least part of each of the at least one utterance, provide for spoken pass-phrase suitability determination wherein the at least one utterance is assigned a pass-phrase-score based on linguistic analysis in which one or more linguistic elements identified in said utterances are assigned their corresponding linguistic-element-score from the predetermined scoring information, the pass-phrase score based on the one or more linguistic-element scores of the, identified, linguistic elements, wherein the spoken pass-phrase suitability is determined to be deficient at least based on the pass-phrase score being below a predetermined pass-phrase score threshold, and, wherein the linguistic elements comprises phonemes and/or phones and the apparatus is configured to provide for segmentation of the one, or each, utterance of the pass-phrase into a plurality of individual phonemes and/or phones, and wherein each of the plurality of phonemes and/or phones is assigned its linguistic-element-score in accordance with the predetermined scoring information, the pass-phrase score based on the linguistic-element-scores for the plurality of phonemes and/or phones; and characterised in that the pass-phrase suitability is also determined to be deficient based on an identification of an insufficient number of linguistic elements that have a linguistic-element-score above a distinctiveness threshold using a minimum distinctiveness threshold. based on at least one utterance of a pass-phrase (201, 202, 203) and predetermined scoring information comprising predetermined linguistic-element-scores attributable to one or more linguistic elements that form at least part of each of the at least one utterance, provide for spoken pass-phrase suitability determination wherein the at least one utterance is assigned a pass-phrase-score based on linguistic analysis in which one or more linguistic elements identified in said utterances are assigned their corresponding linguistic-element-score from the predetermined scoring information, the pass-phrase score based on the one or more linguistic-element scores of the, identified, linguistic elements, wherein the spoken pass-phrase suitability is determined to be deficient at least based on the pass-phrase score being below a predetermined pass-phrase score threshold, and, wherein the linguistic elements comprises phonemes and/or phones and the apparatus is configured to provide for segmentation of the one, or each, utterance of the pass-phrase into a plurality of individual phonemes and/or phones, and wherein each of the plurality of phonemes and/or phones is assigned its linguistic-element-score in accordance with the predetermined scoring information, the pass-phrase score based on the linguistic-element-scores for the plurality of phonemes and/or phones; and characterised in that the pass-phrase suitability is also determined to be deficient based on an identification of an insufficient number of linguistic elements that have a linguistic-element-score above a distinctiveness threshold using a minimum distinctiveness threshold.