Security based on the biological characteristics of human beings is a rather new field and are thriving. There are many other biological factors can be used to identify the user, which is the most typical iris sensor. However, iris sensor systems typically require large and expensive, and therefore is completely inconsistent with the mobile phone. Recently, scientists also propose using each person's heart rate (which is completely different, like a fingerprint) for use in security equipment. Some products, such as bracelets Nymi was launched for use in heart rate as a practical security solutions and user-friendly.
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