Implementation:Liu00222 Open Prompt Injection create attacker

Knowledge Sources	Open-Prompt-Injection
Domains	Prompt_Injection, Adversarial_ML
Last Updated	2026-02-14 15:00 GMT

Overview

Concrete factory function for creating prompt injection attacker instances provided by the OpenPromptInjection attackers module.

Description

The create_attacker function dispatches to the correct Attacker subclass (NaiveAttacker, EscapeCharAttacker, IgnoreAttacker, FakeCompAttacker, CombineAttacker) based on the attack strategy string. Each attacker implements an `.inject(clean_data, idx, target_task)` method that produces attacked prompts.

Usage

Import this function when setting up an experiment to create the attacker that will modify clean data prompts during the attack execution phase.

Code Reference

Source Location

• Repository: Open-Prompt-Injection
• File: OpenPromptInjection/attackers/__init__.py
• Lines: L7-29

Signature

def create_attacker(attack_strategy, task):
    """
    Factory function to create an attacker.

    Args:
        attack_strategy (str): One of 'naive', 'escape', 'ignore',
                               'fake_comp', 'combine'.
        task (InjectedTask): The injected task instance
                             (must have for_injection() == True).
    Returns:
        Attacker: Subclass instance with .inject(clean_data, idx, target_task) method.
    """

Import

import OpenPromptInjection as PI
# or
from OpenPromptInjection import create_attacker

I/O Contract

Inputs

Name	Type	Required	Description
attack_strategy	str	Yes	One of `'naive'`, `'escape'`, `'ignore'`, `'fake_comp'`, `'combine'`
task	InjectedTask	Yes	Injected task instance (must have `for_injection() == True`)

Outputs

Name	Type	Description
attacker	Attacker	Instance with `.inject(clean_data, idx, target_task) -> str` and `.task` attribute

Usage Examples

Creating a Combined Attacker

import OpenPromptInjection as PI
from OpenPromptInjection.utils import open_config

inject_config = open_config("configs/task_configs/hsol_config.json")
inject_task = PI.create_task(inject_config, data_num=100, for_injection=True)

attacker = PI.create_attacker("combine", inject_task)

# Use the attacker to inject into clean data
attacked_prompt = attacker.inject("The movie was great.", idx=0, target_task="sst2")
print(attacked_prompt)

Related Pages

Implements Principle

• Principle:Liu00222_Open_Prompt_Injection_Attacker_Creation

Uses Heuristic

• Heuristic:Liu00222_Open_Prompt_Injection_Attack_Effectiveness_Hierarchy