Abstract:

To ensure the security and privacy of fingerprint information， a very few sample conditional fingerprint image detail encryption algorithm considering privacy information security is proposed. Under extremely few sample conditions， the fingerprint plaintext image is divided into multiple square image blocks using the block principle of the square theorem to construct the magic square matrix required for scrambling. After unfolding and scrambling each matrix， operations such as stitching and transposing are carried out to fully diffuse all pixels and restore them to the original fingerprint image size. After multiple scrambling operations， the pre encrypted fingerprint image is obtained. Compose a fingerprint image cube from plaintext images， form an initial key through the hash value and external parameters of the plaintext image， and substitute it into a chaotic system to form the desired sequence. Using chaotic sequences to form masks and rule matrices， dynamic DNA encoding is performed on the mask matrix and scrambling results. At the same time， DNA operations are performed on the encoded image cube and mask matrix through a rule matrix， and the final encrypted fingerprint image details can be obtained through DNA dynamic decoding. The experimental results show that the proposed algorithm can more efficiently ensure the privacy information security of fingerprint images under very few sample conditions.

Key words: consider privacy information security, very few sample conditions, fingerprint images, detail encryption