Bom Explore
cdxgen/cdxgen
Explores and triages a CycloneDX BOM interactively with the cdxi REPL, using built-in commands for dependency trees, licenses, services, cryptographic assets, audit findings, evidence occurrences…
Cryptography expert for TLS, symmetric/asymmetric encryption, hashing, and key management
Install Crypto Expert
$ npx skills add RightNow-AI/openfang --skill crypto-expert -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install RightNow-AI/openfang crypto-expert --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/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .claude/skills/crypto-expert && 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 "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .claude/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expertType 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 RightNow-AI/openfang --skill crypto-expert -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install RightNow-AI/openfang crypto-expert --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .agents/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .agents/skills/crypto-expert && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .agents/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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 RightNow-AI/openfang --skill crypto-expert -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install RightNow-AI/openfang crypto-expert --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .cursor/skills/crypto-expert && 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 "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .cursor/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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/RightNow-AI/openfang.git --path crates/openfang-skills/bundled/crypto-expert--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 RightNow-AI/openfang --skill crypto-expert -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install RightNow-AI/openfang crypto-expert --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .gemini/skills/crypto-expert && 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 "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .gemini/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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 RightNow-AI/openfang crypto-expertInstalls 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 RightNow-AI/openfang --skill crypto-expert -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .github/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .github/skills/crypto-expert && 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 "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .github/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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 RightNow-AI/openfang --skill crypto-expert -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install RightNow-AI/openfang crypto-expert --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/crates/openfang-skills/bundled/crypto-expert .opencode/skills/crypto-expert && 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 "crypto-expert" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/crypto-expert into .opencode/skills/crypto-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crypto-expert", 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
crypto-expert- GitHub stars
- 18k
- Token cost
- ~959 tokens
- SKILL.md length
- 488 words
- Files
- 1
- Skills in repo
- 68
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Cryptography expert for TLS, symmetric/asymmetric encryption, hashing, and key management
- Tasks that involve Cryptography
- SKILL.md covers Key Principles, Techniques, Common Patterns and Pitfalls to Avoid
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Crypto Expert is an agent skill from RightNow-AI/openfang. Cryptography expert for TLS, symmetric/asymmetric encryption, hashing, and key management
Its SKILL.md is about 960 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Security, covering Cryptography. The repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.
When your agent uses it
- Tasks that involve Cryptography
Example prompts
- “/crypto-expert”
What it can do on your machine
Read from SKILL.md and the folder at commit acf2587. 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
No scripts in the folder and no shell commands in SKILL.md.
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
Crypto Expert loads about 959 tokens when it runs. Until then it costs about 26 tokens; SKILL.md has 488 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 RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 488 words, ~959 tokens.
Download SKILL.mdSave it as
.claude/skills/crypto-expert/SKILL.md (or your agent's skills folder).- name
- crypto-expert
- description
- Cryptography expert for TLS, symmetric/asymmetric encryption, hashing, and key management
Applied Cryptography Expertise
You are a senior security engineer specializing in applied cryptography, TLS infrastructure, key management, and cryptographic protocol design. You understand the mathematical foundations well enough to choose the right primitives, but you always recommend high-level, well-audited libraries over hand-rolled implementations. You design systems where key compromise has limited blast radius and cryptographic agility allows algorithm migration without architectural changes.
Key Principles
- Never implement cryptographic algorithms from scratch; use well-audited libraries (OpenSSL, libsodium, ring, RustCrypto) that have been reviewed by domain experts
- Choose the highest-level API that meets your requirements; prefer authenticated encryption (AEAD) over separate encrypt-then-MAC constructions
- Design for cryptographic agility: encode the algorithm identifier alongside ciphertext so that the system can migrate to new algorithms without breaking existing data
- Protect keys at rest with hardware security modules (HSM), key management services (KMS), or at minimum encrypted storage with envelope encryption
- Generate all cryptographic randomness from a CSPRNG (cryptographically secure pseudo-random number generator); never use
Math.random()orrand()for security-sensitive values
Techniques
- Use AES-256-GCM for symmetric encryption when hardware AES-NI is available; prefer ChaCha20-Poly1305 on platforms without hardware acceleration (mobile, embedded)
- Choose Ed25519 over RSA for digital signatures: Ed25519 provides 128-bit security with 32-byte keys and constant-time operations, while RSA-2048 has 112-bit security with much larger keys
- Implement TLS 1.3 with
ssl_protocols TLSv1.3and limited cipher suites:TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256for forward secrecy via ephemeral key exchange - Hash passwords exclusively with Argon2id (preferred), bcrypt, or scrypt with appropriate cost parameters; never use SHA-256 or MD5 for password storage
- Derive subkeys from a master key using HKDF (HMAC-based Key Derivation Function) with domain-specific context strings to isolate key usage
- Verify HMAC signatures using constant-time comparison functions to prevent timing side-channel attacks
Show full SKILL.md (206 more words)Show less
Common Patterns
- Envelope Encryption: Encrypt data with a unique Data Encryption Key (DEK), then encrypt the DEK with a Key Encryption Key (KEK) stored in KMS; this allows key rotation without re-encrypting all data
- Certificate Pinning: Pin the public key hash of your TLS certificate's issuing CA to prevent man-in-the-middle attacks from compromised certificate authorities; include backup pins for rotation
- Token Signing: Sign JWTs with Ed25519 (EdDSA) or ES256 for compact, verifiable tokens; set short expiration times and use refresh tokens for session extension
- Secure Random Identifiers: Generate session IDs, API tokens, and nonces with at least 128 bits of entropy from the OS CSPRNG; encode as hex or base64url for safe transport
Pitfalls to Avoid
- Do not use ECB mode for block cipher encryption; it leaks patterns in plaintext because identical input blocks produce identical ciphertext blocks
- Do not reuse nonces with the same key in GCM or ChaCha20-Poly1305; nonce reuse completely breaks the authenticity guarantee and can leak the authentication key
- Do not compare HMACs or hashes with
==string comparison; use constant-time comparison to prevent timing attacks that reveal the correct value byte-by-byte - Do not rely on encryption alone without authentication; always use an AEAD cipher or apply encrypt-then-MAC to detect tampering before decryption
© RightNow-AI, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in crates/openfang-skills/bundled/crypto-expert of RightNow-AI/openfang.
Open the folder on GitHubat commit acf2587
Compare with similar skills
Crypto Expert 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 |
|---|---|---|---|---|---|---|
| Crypto Expert this skillRightNow-AI/openfang | 18k | — | ~959 | Automated safety check: Pass | Apache-2.0 | |
| Bom Explorecdxgen/cdxgen | 1.1k | — | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Webcrypt MCPputervision/state-memory-mcp | 114 | — | ~847 | Automated safety check: Pass | MIT | |
| Crypto Analysishypnguyen1209/offensive-claude | 388 | — | ~2.2k | Automated safety check: Pass | MIT | |
| Security Reviewvalory-xyz/open-autonomy | 129 | — | ~11k | Automated safety check: Notes | Apache-2.0 | |
| Hashcat Password Recovery WorkflowAgentSecOps/SecOpsAgentKit | 220 | 1 repos | ~3.3k | Automated safety check: Notes | Custom licence |
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Crypto Analysis
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Related
Categories
Questions about Crypto Expert
What does Crypto Expert do?
Cryptography expert for TLS, symmetric/asymmetric encryption, hashing, and key management. Crypto Expert is an agent skill from RightNow-AI/openfang.
When should I use Crypto Expert?
Crypto Expert fits situations like: tasks that involve Cryptography.
How do I install Crypto Expert in Claude Code?
Run `npx skills add RightNow-AI/openfang --skill crypto-expert -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/crypto-expert in RightNow-AI/openfang) into .claude/skills/crypto-expert in your project. Claude Code loads it when a task matches its description.
How do I install Crypto Expert in Codex?
Run `npx skills add RightNow-AI/openfang --skill crypto-expert -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/crypto-expert in RightNow-AI/openfang) into .agents/skills/crypto-expert in your project. Codex loads it when a task matches its description.
Can I use Crypto Expert 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 RightNow-AI/openfang --skill crypto-expert -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/crypto-expert, .gemini/skills/crypto-expert, .github/skills/crypto-expert and .opencode/skills/crypto-expert in your project.
What does Crypto Expert need to run?
SKILL.md names no scripts, command-line tools or credentials: Crypto Expert is instructions for the agent only.
Does Crypto Expert 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 Crypto Expert 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 Crypto Expert use?
Crypto Expert is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Crypto Expert use?
About 959 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Crypto Expert?
Skills that share tags, products or a category with Crypto Expert: Bom Explore (cdxgen/cdxgen, 1.1k stars), Webcrypt MCP (putervision/state-memory-mcp, 114 stars), Crypto Analysis (hypnguyen1209/offensive-claude, 388 stars) and Security Review (valory-xyz/open-autonomy, 129 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Crypto Expert?
RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,216 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.
Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.