Abstract
This paper proposes a hybrid scheme which combines modified shielding function with a one-way transformation technique known as matrix transformation. The modified shielding function is an improved version of the generic shielding function which eliminates the need for quantization and reliable bit selection. Concatenated error correction is applied to correct errors at the block level (burst errors) and bit level (bit errors within each block) unlike previous implementations of the shielding function which address only bit errors. The proposed matrix transformation technique is used to carry out a one-way, irreversible transformation of binary face templates before securing them with the shielding function. Experimental results show that the hybrid scheme has good recognition performance. Results from security analysis show that the scheme is resistant to guessing, replay, key exhaustion and template inversion attacks. It is also robust against privacy attacks such as decodability and cross-matching.
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