Functional encryption applied to privacy-preserving classification : practical use, performances and security

Damien Ligier 1, 2
1 Lab-STICC_IMTA_CID_IRIS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : Machine Learning (ML) algorithms have proven themselves very powerful. Especially classification, enabling to efficiently identify information in large datasets. However, it raises concerns about the privacy of this data. Therefore, it brought to the forefront the challenge of designing machine learning algorithms able to preserve confidentiality.This thesis proposes a way to combine some cryptographic systems with classification algorithms to achieve privacy preserving classifier. The cryptographic system family in question is the functional encryption one. It is a generalization of the traditional public key encryption in which decryption keys are associated with a function. We did some experimentations on that combination on realistic scenario using the MNIST dataset of handwritten digit images. Our system is able in this use case to know which digit is written in an encrypted digit image. We also study its security in this real life scenario. It raises concerns about uses of functional encryption schemes in general and not just in our use case. We then introduce a way to balance in our construction efficiency of the classification and the risks.
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Damien Ligier. Functional encryption applied to privacy-preserving classification : practical use, performances and security. Cryptography and Security [cs.CR]. Ecole nationale supérieure Mines-Télécom Atlantique, 2018. English. ⟨NNT : 2018IMTA0040⟩. ⟨tel-02389839⟩

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