A system lets someone send a digital item locked behind a puzzle. The sender picks an item and creates a lock, which includes an image and a hidden trace path on it. To unlock the item, the recipient must correctly trace that path on the image using a touchscreen; if their trace matches the original path, they receive the digital item.
Why it matters: The growing demand for intuitive, passwordless authentication methods and engaging secure digital content delivery experiences since 2019 could make this interactive lock mechanism more attractive for implementation in secure transactions.
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