2021 IEEE International Conference on Acoustics, Speech and Signal Processing

6-11 June 2021 • Toronto, Ontario, Canada

Extracting Knowledge from Information

2021 IEEE International Conference on Acoustics, Speech and Signal Processing

6-11 June 2021 • Toronto, Ontario, Canada

Extracting Knowledge from Information
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Paper Detail

Paper IDIFS-2.5
Paper Title HANDWRITTEN DIGITS RECONSTRUCTION FROM UNLABELLED EMBEDDINGS
Authors Thomas Thebaud, Gaël Le Lan, Orange Labs, France; Anthony Larcher, Laboratoire d'Informatique de l'Université du Mans, France
SessionIFS-2: Multimedia Forensics 2
LocationGather.Town
Session Time:Tuesday, 08 June, 13:00 - 13:45
Presentation Time:Tuesday, 08 June, 13:00 - 13:45
Presentation Poster
Topic Information Forensics and Security: [MMF] Multimedia Forensics
IEEE Xplore Open Preview  Click here to view in IEEE Xplore
Abstract In this paper, we investigate template reconstruction attack of touchscreen biometrics, based on handwritten digits writer verification. In the event of a template database theft, we show that reconstructing the original drawn digit from the embeddings is possible without access to the original embedding encoder. Using an external labelled dataset, an attack encoder is trained along with a Mixture Density Recurrent Neural Network decoder. Thanks to an alignment flow, initialized with Linear Discriminant Analysis and Procrustes, the transfer function between the output space of the original and the attack encoder is estimated. The successive application of transfer function and decoder to the stolen embeddings allows to reconstruct the original drawings, which can be used to spoof the behavioural biometrics system.