Biometric key generating method adapting to dynamic quantization

Abstract

The invention discloses a biometric key generating method adapting to dynamic quantization. The method comprises the following implementation steps: 1, acquiring a human electrocardiograph signal, and performing wavelet transform de-nosing and normalization processing on the human electrocardiograph signal; 2, performing R-wave detection on the normalized electrocardiograph signal, and extracting a pulse spacing feature; 3, performing statistics to obtain a mean value and a variance of the pulse spacing feature, and calculating information entropy of the pulse spacing feature according to the variance; 4, adaptively and dynamically determining a quantization bit of the pulse spacing feature according to the information entropy of the pulse spacing feature; 5, performing quantization coding on pulse spacing according to the determined quantization bit to generate a biometric feature sequence; and 6, performing key negotiation on the generated biometric feature sequence through a sensor node and a coordinator node to generate a biometric key shared by the two nodes. Through adoption of the method, key randomness is ensured; the biometric key generation efficiency is increased; and the fault probability of identity authentication is lowered. The method can be applied to authentication among wireless body area network nodes.

Description

technical field [0001] The invention belongs to the technical field of network security, and in particular relates to a method for generating a biological key, which can be used for authentication between WBAN nodes. Background technique [0002] With the extensive development and application of wireless communication technology, wearable technology, and low-power sensor technology in the medical field, wireless body area network has become an important technology for remote medical health information collection and transmission. Since it involves the user's personal privacy and user's personal safety, the issue of data security communication in wireless body area network is particularly important. Verifying the identity of sensors in wireless body area network is the primary problem to be solved in secure communication. The existing identity authentication technology uses public key certificates, but involves a large number of public key calculations and requires the exist...

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Problems solved by technology

However, the length of the key generated by this method is short, the rate of key generation is low, and only the difference between the pulse interval IPI values ​​from different sensor nodes at the same time is retained, so that the pulse interval IPI measurements from different parts of the same human body are different. Generated key bits have a high rate of inconsistency, causing a high probability of false rejection

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