# Security Hardening

> AIDefence security layer with prompt injection blocking, input validation, sandboxed execution, output sanitization, and STRIDE threat modeling.

- Skill: `a5c-ai/security-hardening` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add a5c-ai/security-hardening`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/security-hardening/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-08-19
- Page: https://skillmd.com/skills/a5c-ai/security-hardening

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- When processing untrusted inputs
- Security audits of agent-generated code
- Compliance verification (OWASP Top 10, CIS)

## AIDefence Layers

1. **Prompt Injection Detection** - Pattern + heuristic blocking
2. **Input Validation** - Path traversal, type coercion, parameter sanitization
3. **Static Analysis (SAST)** - Vulnerability scanning, CWE matching
4. **Sandboxed Execution** - Network isolation, filesystem restrictions, resource limits
5. **Output Sanitization** - Secrets, PII, injection vector redaction

## Security Levels

| Level | Layers | Use Case |
|-------|--------|----------|
| standard | SAST + validation + sanitization | Routine audits |
| elevated | + threat modeling + compliance | Pre-release audits |
| maximum | + sandbox + full STRIDE + remediation | Critical systems |

## Agents Used

- `agents/security-auditor/` - Vulnerability detection
- `agents/reviewer/` - Code quality verification

## Tool Use

Invoke via babysitter process: `methodologies/ruflo/ruflo-security-audit`