Search Results for author: Stjepan Picek

Found 11 papers, 3 papers with code

Watermarking Graph Neural Networks based on Backdoor Attacks

no code implementations21 Oct 2021 Jing Xu, Stjepan Picek

We 1) design two strategies to generate watermarked data for the graph classification and one for the node classification task, 2) embed the watermark into the host model through training to obtain the watermarked GNN model, and 3) verify the ownership of the suspicious model in a black-box setting.

Classification Graph Classification +1

Hand Me Your PIN! Inferring ATM PINs of Users Typing with a Covered Hand

no code implementations15 Oct 2021 Matteo Cardaioli, Stefano Cecconello, Mauro Conti, Simone Milani, Stjepan Picek, Eugen Saraci

We consider the setting where the attacker can access an ATM PIN pad of the same brand/model as the target one.

Can You Hear It? Backdoor Attacks via Ultrasonic Triggers

no code implementations30 Jul 2021 Stefanos Koffas, Jing Xu, Mauro Conti, Stjepan Picek

In such an attack, the third party training the model may maliciously inject hidden behaviors into the model.

automatic-speech-recognition Speech Recognition

Evolutionary Algorithms for Designing Reversible Cellular Automata

1 code implementation25 May 2021 Luca Mariot, Stjepan Picek, Domagoj Jakobovic, Alberto Leporati

Reversible Cellular Automata (RCA) are a particular kind of shift-invariant transformations characterized by a dynamics composed only of disjoint cycles.

Fitness Landscape Analysis of Dimensionally-Aware Genetic Programming Featuring Feynman Equations

no code implementations27 Apr 2020 Marko Durasevic, Domagoj Jakobovic, Marcella Scoczynski Ribeiro Martins, Stjepan Picek, Markus Wagner

Genetic programming is an often-used technique for symbolic regression: finding symbolic expressions that match data from an unknown function.

Towards an evolutionary-based approach for natural language processing

no code implementations23 Apr 2020 Luca Manzoni, Domagoj Jakobovic, Luca Mariot, Stjepan Picek, Mauro Castelli

Tasks related to Natural Language Processing (NLP) have recently been the focus of a large research endeavor by the machine learning community.

CoInGP: Convolutional Inpainting with Genetic Programming

1 code implementation23 Apr 2020 Domagoj Jakobovic, Luca Manzoni, Luca Mariot, Stjepan Picek, Mauro Castelli

In the second experiment, we train a GP convolutional predictor on two degraded images, removing around 20% of their pixels.

A characterisation of S-box fitness landscapes in cryptography

no code implementations13 Feb 2019 Domagoj Jakobovic, Stjepan Picek, Marcella S. R. Martins, Markus Wagner

Substitution Boxes (S-boxes) are nonlinear objects often used in the design of cryptographic algorithms.

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