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Bibliographic Details
Main Authors:	Lachnit, Simon, Karame, Ghassan
Format:	Preprint
Published:	2025
Subjects:	Cryptography and Security
Online Access:	https://arxiv.org/abs/2509.05192
Tags:	Add Tag No Tags, Be the first to tag this record!

Tuning for Two Adversaries: Enhancing the Robustness Against Transfer and Query-Based Attacks using Hyperparameter Tuning
by: Zimmer, Pascal, et al.
Published: (2025)

On the Effectiveness of Mempool-based Transaction Auditing
by: Albrecht, Jannik, et al.
Published: (2026)

Mitigating Collusion in Proofs of Liabilities
by: Mohamed, Malcom, et al.
Published: (2026)

On the Robustness of Distributed Machine Learning against Transfer Attacks
by: Andreina, Sébastien, et al.
Published: (2024)

The Real Menace of Cloning Attacks on SGX Applications
by: Wilde, Annika, et al.
Published: (2026)

On Abnormal Execution Timing of Conditional Jump Instructions
by: Wilde, Annika, et al.
Published: (2026)

On Securing the Software Development Lifecycle in IoT RISC-V Trusted Execution Environments
by: Wilde, Annika, et al.
Published: (2026)

Practical Light Clients for Committee-Based Blockchains
by: Armknecht, Frederik, et al.
Published: (2024)

The Forking Way: When TEEs Meet Consensus
by: Wilde, Annika, et al.
Published: (2024)

HCC: A Language-Independent Hardening Contract Compiler for Smart Contracts
by: Giesen, Jens-Rene, et al.
Published: (2022)

Larger-scale Nakamoto-style Blockchains Don't Necessarily Offer Better Security
by: Albrecht, Jannik, et al.
Published: (2024)

SseRex: Practical Symbolic Execution of Solana Smart Contracts
by: Cloosters, Tobias, et al.
Published: (2026)

Fuzz on the Beach: Fuzzing Solana Smart Contracts
by: Smolka, Sven, et al.
Published: (2023)

Closing the Gap: Achieving Better Accuracy-Robustness Tradeoffs against Query-Based Attacks
by: Zimmer, Pascal, et al.
Published: (2023)

Defying the Odds: Solana's Unexpected Resilience in Spite of the Security Challenges Faced by Developers
by: Andreina, Sébastien, et al.
Published: (2024)

BackdoorIndicator: Leveraging OOD Data for Proactive Backdoor Detection in Federated Learning
by: Li, Songze, et al.
Published: (2024)

How to Privately Tune Hyperparameters in Federated Learning? Insights from a Benchmark Study
by: Mitic, Natalija, et al.
Published: (2024)

Harmless Backdoor-based Client-side Watermarking in Federated Learning
by: Luo, Kaijing, et al.
Published: (2024)

Sample-Independent Federated Learning Backdoor Attack in Speaker Recognition
by: Xu, Weida, et al.
Published: (2024)

Infighting in the Dark: Multi-Label Backdoor Attack in Federated Learning
by: Li, Ye, et al.
Published: (2024)

Distributed Backdoor Attacks on Federated Graph Learning and Certified Defenses
by: Yang, Yuxin, et al.
Published: (2024)

Runtime Backdoor Detection for Federated Learning via Representational Dissimilarity Analysis
by: Zhang, Xiyue, et al.
Published: (2025)

BDPFL: Backdoor Defense for Personalized Federated Learning via Explainable Distillation
by: Zhu, Chengcheng, et al.
Published: (2025)

SPA: Towards More Stealth and Persistent Backdoor Attacks in Federated Learning
by: Zhu, Chengcheng, et al.
Published: (2025)

On the Out-of-Distribution Backdoor Attack for Federated Learning
by: Xu, Jiahao, et al.
Published: (2025)

You Can Backdoor Personalized Federated Learning
by: Ye, Tiandi, et al.
Published: (2023)

Backdoor Attacks in Peer-to-Peer Federated Learning
by: Syros, Georgios, et al.
Published: (2023)

HPE: Hallucinated Positive Entanglement for Backdoor Attacks in Federated Self-Supervised Learning
by: Wang, Jiayao, et al.
Published: (2026)

Hyperparameter Optimization for SecureBoost via Constrained Multi-Objective Federated Learning
by: Kang, Yan, et al.
Published: (2024)

Cooperative Decentralized Backdoor Attacks on Vertical Federated Learning
by: Lee, Seohyun, et al.
Published: (2025)

Watch Out! Simple Horizontal Class Backdoor Can Trivially Evade Defense
by: Ma, Hua, et al.
Published: (2023)

MARS: A Malignity-Aware Backdoor Defense in Federated Learning
by: Wan, Wei, et al.
Published: (2025)

Robust Knowledge Distillation in Federated Learning: Counteracting Backdoor Attacks
by: Alharbi, Ebtisaam, et al.
Published: (2025)

Backdoor Federated Learning by Poisoning Backdoor-Critical Layers
by: Zhuang, Haomin, et al.
Published: (2023)

BackdoorDM: A Comprehensive Benchmark for Backdoor Learning on Diffusion Model
by: Lin, Weilin, et al.
Published: (2025)

SABRE-FL: Selective and Accurate Backdoor Rejection for Federated Prompt Learning
by: Khan, Momin Ahmad, et al.
Published: (2025)

BadFU: Backdoor Federated Learning through Adversarial Machine Unlearning
by: Lu, Bingguang, et al.
Published: (2025)

Securing Federated Learning against Backdoor Threats with Foundation Model Integration
by: Bi, Xiaohuan, et al.
Published: (2024)

Let's Focus: Focused Backdoor Attack against Federated Transfer Learning
by: Arazzi, Marco, et al.
Published: (2024)

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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