Abstract:Personal Identi cation Numbers (PINs) are widely used as an access control mechanism for digital assets (e.g., smartphones), nancial assets (e.g., ATM cards), and physical assets (e.g., locks for garage doors or homes). Using semistructured interviews (n=35), participants reported on PIN usage for di erent types of assets, including how users choose, share, inherit, and reuse PINs, as well as behaviour following the compromise of a PIN. We nd that memorability is the most important criterion when choosing a PI… Show more
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