Security And Hardening
penpot/penpot
Hardens code against vulnerabilities. An agent skill from penpot/penpot.
Security rule for timing-safe secret comparison. An agent skill from paralleldrive/aidd.
Install Aidd Timing Safe Compare
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compare --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .claude/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .claude/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .claude/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compareType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compare --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .agents/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .agents/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .agents/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compare --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .cursor/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .cursor/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/paralleldrive/aidd.git --path ai/skills/aidd-timing-safe-compare--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compare --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .gemini/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .gemini/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compareInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .github/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .github/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .github/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install paralleldrive/aidd aidd-timing-safe-compare --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/paralleldrive/aidd.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/ai/skills/aidd-timing-safe-compare .opencode/skills/aidd-timing-safe-compare && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "aidd-timing-safe-compare" agent skill from https://github.com/paralleldrive/aidd/tree/main/ai/skills/aidd-timing-safe-compare into .opencode/skills/aidd-timing-safe-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "aidd-timing-safe-compare", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
aidd-timing-safe-compare- GitHub stars
- 384
- Token cost
- ~575 tokens
- SKILL.md length
- 289 words
- Files
- 4 (incl. references)
- Skills in repo
- 35
- Repo updated
- First seen
- Licence
- MIT
At a glance
Security rule for timing-safe secret comparison. An agent skill from paralleldrive/aidd.
- Works in 3 steps: Hashing removes all prefix structure.… → Raw secrets never appear in logs or… → Fixed-length output eliminates length…
- Implementing secret comparisons
- SKILL.md covers Guide and Review
- Runs JavaScript scripts from its folder
What it does
Aidd Timing Safe Compare is an agent skill from paralleldrive/aidd. Security rule for timing-safe secret comparison. Use SHA3-256 hashing instead of timing-safe compare functions. Use when reviewing or implementing secret comparisons, token validation, CSRF tokens, or API key checks.
Its SKILL.md is about 580 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `README.md`, `references/vulnerabilities.md` and `timing-safe-compare.test.js`).
It sits in Security, covering Web application vulnerabilities. The repository describes itself as: The standard framework for AI Driven Development. The licence is MIT.
When your agent uses it
- Implementing secret comparisons
- Token validation
Example prompts
- “/aidd-timing-safe-compare”
Requirements
- Node.js
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Hashing removes all prefix structure. Any bit change fully randomizes the hash. No timing oracle. No hangman.
- Raw secrets never appear in logs or errors.
- Fixed-length output eliminates length oracle attacks.
What it can do on your machine
Read from SKILL.md and the folder at commit 9a7c8e3. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (JavaScript), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Aidd Timing Safe Compare loads about 575 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 60 tokens; SKILL.md has 289 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from paralleldrive/aidd at commit 9a7c8e3, republished under its MIT licence (© paralleldrive). 289 words, ~575 tokens.
Download SKILL.mdSave it as
.claude/skills/aidd-timing-safe-compare/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- aidd-timing-safe-compare
- description
- Security rule for timing-safe secret comparison. Use SHA3-256 hashing instead of timing-safe compare functions. Use when reviewing or implementing secret comparisons, token validation, CSRF tokens, or API key checks.
Constraint: Timing Safe Compare
If a compare returns faster when some prefix values are correct, attackers can play a game of hangman to guess the secret. Using statistics, this can still work over a network with timing jitter.
There is no timing safe compare for raw values. Never use:
- crypto.timingSafeEqual
- hmac.compare_digest
- subtle.ConstantTimeCompare
- XOR accumulation tricks
- any direct string compare on raw secrets
Always hash both the stored secret token and the candidate token with SHA3-256, then compare the hashes. This rule overrides all library defaults.
See timing-safe compare vulnerabilities for vulnerability reports in the wild.
Reasons:
- Hashing removes all prefix structure. Any bit change fully randomizes the hash. No timing oracle. No hangman.
- Raw secrets never appear in logs or errors.
- Fixed-length output eliminates length oracle attacks.
Patterns {
Guide
(timing safe compare needed?) => Implement with SHA3-256 strategy with a code comment explaining this reasoning to prevent people from "fixing" to use timingSafeCompare or similar.
Use SHA3-256 in a named helper, hash both values, then compare digests. That pattern is approved with or without a timing safe compare call because there is no stable prefix structure to game. Do not flag it as a major timing-unsafe finding.
Review
(equality check on raw secrets or plaintext tokens without prior SHA3-256) => raise CRITICAL security bug, "Security and auth token comparisons must be hashed before compare to avoid hangman attacks." (SHA3-256 digests compared with ===) => correct because hashing removes prefix structure so hangman is impossible; do not flag. (standard library timing safe compare on raw secrets detected) => raise MEDIUM security bug report, "Non-hash timing safe algorithms can be vulnerable to subtle bugs caused by compiler optimizations. Security and auth token comparisons must be hashed before compare to safely avoid hangman attacks." }
© paralleldrive, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 3 other files (references) in ai/skills/aidd-timing-safe-compare of paralleldrive/aidd.
- SKILL.md
- README.md
- references/vulnerabilities.md
- timing-safe-compare.test.js
Open the folder on GitHubat commit 9a7c8e3
Compare with similar skills
Aidd Timing Safe Compare next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Aidd Timing Safe Compare this skillparalleldrive/aidd | 384 | — | ~575 | Automated safety check: Pass | MIT | |
| Security And Hardeningpenpot/penpot | 61k | 6 repos | ~4.7k | Automated safety check: Notes | MPL-2.0 | |
| Security Auditoreigent-ai/eigent | 15k | — | ~1.8k | Automated safety check: Notes | Apache-2.0 | |
| Security Reviewjewbetcha/opentrace | 116 | 18 repos | ~3.1k | Automated safety check: Notes | MIT | |
| Strix Code Vulnerability Scanusestrix/strix | 67k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Code Audit3stoneBrother/code-audit | 893 | 1 repos | ~2.7k | Automated safety check: Pass | None |
Similar skills
Security Auditor
eigent-ai/eigent
Audits source code, dependencies and config files for vulnerabilities and hardcoded secrets, using two bundled Python scanners and an OWASP Top 10 checklist.
Security Review
jewbetcha/opentrace
A skill your agent uses when adding authentication, handling user input, working with secrets, creating API endpoints, or implementing payment/sensitive features.
Strix Code Vulnerability Scan
usestrix/strix
Runs a Strix white-box security review that reads the source, then exploits what it finds in a sandbox so each reported issue has a proof-of-concept.
Code Audit
3stoneBrother/code-audit
Professional code security audit skill covering 55+ vulnerability types.
Fix Strix Security Findings
usestrix/strix
Triages findings from a Strix pentest by severity, fixes each root cause with a minimal change, and re-runs Strix to confirm the exploit no longer works.
More from paralleldrive/aidd
All 35 skills in this repoAIDD Skill Authoring Guide
paralleldrive/aidd
Guides creating, reviewing or refactoring AI-Driven Development skills so each one stays minimal, composable and named around a single clear function.
AIDD UI Layout Patterns
paralleldrive/aidd
Enforces a split of UI components into terminal and layout types, with layout components composing others through standard layout tokens, for cleaner structure and fewer re-renders.
Adobe Data ECS Plugin Rules
paralleldrive/aidd
Enforces @adobe/data/ecs practices when writing Database.Plugin definitions, including property order, plugin composition, services, components, resources and archetypes.
Error Causes Handling
paralleldrive/aidd
Has your agent throw and catch JavaScript and TypeScript errors with the error-causes library, using named causes, preserved originals and routed handlers.
JavaScript IO Effects With Sagas
paralleldrive/aidd
Teaches the saga pattern with call and put so network requests and side effects stay out of the logic and sagas can be tested without mocks.
Lit Element Authoring
paralleldrive/aidd
Rules for writing Lit elements in an AIDD project: binding elements on DatabaseElement, observed values, presentation components and action-style callbacks.
Related
Categories
Questions about Aidd Timing Safe Compare
What does Aidd Timing Safe Compare do?
Security rule for timing-safe secret comparison. An agent skill from paralleldrive/aidd. Aidd Timing Safe Compare is an agent skill from paralleldrive/aidd. Security rule for timing-safe secret comparison.
When should I use Aidd Timing Safe Compare?
Aidd Timing Safe Compare fits situations like: implementing secret comparisons; token validation.
How do I install Aidd Timing Safe Compare in Claude Code?
Run `npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a claude-code`. Or copy the skill folder (ai/skills/aidd-timing-safe-compare in paralleldrive/aidd) into .claude/skills/aidd-timing-safe-compare in your project. Claude Code loads it when a task matches its description.
How do I install Aidd Timing Safe Compare in Codex?
Run `npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a codex`. Or copy the skill folder (ai/skills/aidd-timing-safe-compare in paralleldrive/aidd) into .agents/skills/aidd-timing-safe-compare in your project. Codex loads it when a task matches its description.
Can I use Aidd Timing Safe Compare in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add paralleldrive/aidd --skill aidd-timing-safe-compare -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/aidd-timing-safe-compare, .gemini/skills/aidd-timing-safe-compare, .github/skills/aidd-timing-safe-compare and .opencode/skills/aidd-timing-safe-compare in your project.
What does Aidd Timing Safe Compare need to run?
Going by SKILL.md and its folder, Aidd Timing Safe Compare needs JavaScript for the scripts in its folder. Our summary lists: Node.js.
Does Aidd Timing Safe Compare access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Aidd Timing Safe Compare safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Aidd Timing Safe Compare use?
Aidd Timing Safe Compare is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Aidd Timing Safe Compare use?
About 575 tokens (SKILL.md is roughly 2.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 498 tokens, read only when the agent opens those files.
What are the alternatives to Aidd Timing Safe Compare?
Skills that share tags, products or a category with Aidd Timing Safe Compare: Security And Hardening (penpot/penpot, 61k stars), Security Auditor (eigent-ai/eigent, 15k stars), Security Review (jewbetcha/opentrace, 116 stars) and Strix Code Vulnerability Scan (usestrix/strix, 67k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Aidd Timing Safe Compare?
paralleldrive (a GitHub organization) maintains it in paralleldrive/aidd, which has 384 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on June 12, 2026.
Source: paralleldrive/aidd on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.