SYSTEM, METHOD AND PROGRAM FOR GENERATING ENCRYPTION KEY

摘要

PROBLEM TO BE SOLVED: To provide an encryption key generation system that generates an encryption key in response to a similar motion.

SOLUTION: A key generation system includes: a sensor 1 for detecting the motion of a user; a feature extraction means 3 for extracting features such as FFT, variant value and the like from sensor output; a feature exchange means 4 for exchanging the obtained features with key generating devices each other; a motion similarity comparison means 5 for determining motion similarity based on a time sequential change in variant value and similarity of features for each frequency in the obtained features; and a key generating means 6 for selecting features for key generation in accordance with a degree of similarity determined by the motion similarity comparison means and for generating an encryption key while utilizing only an interval of the similarity features. When similarity for each frequency is high, features are quantized to generate the encryption key, when only the similarity in the time sequential change of the variant value is high, quantization is performed by threshold processing to generate the encryption key and when similarity is low both in the features for each frequency and in the time sequential change of the variant value, the key is not generated.

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