Turning a Backdoor's Step Function Into a Ramp

Overview

A backdoor behaves like a step function: invisible until its trigger fires, fully present the instant it does. That makes it a bad target for anything that relies on a smooth gradient to search for it. This project proposes a way to temporarily turn that step into a slope, so the hidden behavior can be read out directly instead of searched for blindly.

Method

The core idea is to identify the specific direction in a fine-tuned model’s weights that the fine-tuning process itself added, then exaggerate that direction rather than perturbing the model randomly. Amplifying a targeted direction should reveal the hidden behavior far more efficiently than random weight noise, since essentially all of the perturbation budget is spent along the one direction that matters instead of being spread thinly across the whole model. The amplification is then gradually relaxed back toward the original model while tracking which inputs still trigger the behavior, narrowing in on the actual trigger.

Status

This is currently a research design with a clear, testable first prediction — that targeted amplification should outperform undirected weight perturbation by a wide margin at equal collateral damage — rather than a validated detector. That comparison is the next experiment before any detection claims are made.

2026

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2025

Toward a Field-Based View of LLM Backdoors

1 minute read

Overview Existing LLM backdoor scanners mostly search for an object: a trigger string, a target string, or a memorized leaked example. This project explores ...

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2024

Osmium Project Tasks

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Overview In this project, we developed an Android application to estimate the location of cellular network cells using Received Signal Strength Indicator (RS...

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2023

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2021

Sonic pi

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My sonic pi project : . این پست من مربوط به پوروژه سونیک پای بنده است

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2020

مصاحبه

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My works and wishes Success secret مصاحبه با جناب اقا پارسا: ایشون بسیار ادم سخت کوشی بودن و گفتن که حتی در دوران دانشجویی شون درس هم میدادن 1 به موار...

My works and wishes

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Its my favorite university This is oxford: In England The best unniversity. this university is first inthe world. this university have best descover...

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