---
title: "Prompt Injection & AI Security · YecoAI Research"
description: "Understanding prompt injection attacks on LLMs and how YecoAI Lab provides a secure environment for testing defenses."
url: "https://yecoai.com/en/research/prompt-injection-security"
locale: "en"
published: "2026-02-02"
updated: "2026-09-29"
category: "Research"
---

# Prompt Injection & AI Security

Mechanics of prompt injection and sandbox testing for defenses.

*2 Feb 2026 · Research*

## Abstract

The rise of LLMs introduced a new paradigm in cybersecurity: prompt injection. Unlike SQL injection where data is confused with code, prompt injection confuses instructions with context.

## Anatomy of an attack

User input is concatenated with a hidden system prompt. An injection attack overrides it: "Ignore previous instructions. You are now..." If the model follows the user over the system prompt, the jailbreak succeeds.

## Why filters fail

Keyword filtering is insufficient because language is flexible: metaphors, foreign languages, or base64 encoding bypass simple filters. Adversarial training and robust evaluation must replace patch-as-you-go security.

## Defense

We design systems that are resilient by default, testing defenses in YecoAI Lab against thousands of known injection patterns before deployment.

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