cryptography MCP servers & tools

Privacy-preserving AI gateway. Sanitises PII (German + English; Microsoft Presidio + custom recognisers) before prompts reach Anthropic / OpenAI / your LLM, then emits a signed cryptographic certificate per call (Ed25519 + RFC 3161 timestamp + Sigstore Rekor anchoring). EU GDPR + AI Act ready. Free tier 500 calls/month, BYOK. Install: npx -y @lucairn/mcp-server. Docs: https://lucairn.eu/developer/mcp.

Proof-of-behavior enforcement for AI agents. Define behavioral covenant rules (permit/forbid/require), enforce at runtime before execution, get SHA-256 hash-chained tamper-evident audit logs, and verify compliance independently. Cross-agent verification handshake — no proof, no transaction. MIT licensed, 4,244 tests.

Third-party certifying proxy — sign any HTTP call (AI agents, webhooks, microservices) with an independent Ed25519 signature, RFC 3161 timestamp, and Sigstore Rekor anchor. Works with Claude, GPT-4, Mistral, LangChain, AutoGen, or any HTTP client.

Verifiable oracle MCP server: Platon VRF (getrandom), Chronos VDF (computevdf / verifyvdf), LUMEN reputation (getreputationscores) as agent tools. Pay-per-call over AIMarket Hub; every result independently verifiable. stdio · Python · Glama.

On-chain Ed25519 identity for AI agents — verify seals by fingerprint, validate document signatures, and gate irreversible actions behind human-signed approval tokens. Hosted at api.waxseal.id/mcp; local install (npx @waxseal/mcp) for signing.

A Model Context Protocol server that brings the capabilities of enigmapython library to LLMs, allowing them to encrypt and decrypt messages using historically accurate Enigma machine emulators.

Burn-after-read encrypted notes for AI agents. Create and read self-destructing notes via Volta Notes with AES-256-GCM E2E encryption — the decryption key never leaves the URL fragment. Secure credential handoff between users and agents without secrets appearing in chat history.

Zero-knowledge password manager with MCP credential gateway. BIP-39 seed phrase recovery, deterministic passwords, policy-gated AI agent access (scope, rate limits, time windows, step-up approval), 70+ API key providers, and hash-chain audit trail. Go + Next.js + TypeScript.

Cryptographic receipts for AI outputs: notarize any model inference with a signed Ed25519 attestation, sha256 content hash, and Merkle chain-anchor on Base or Solana. $0.001 per call via x402 USDC micropayments; verification is free and needs no wallet. Notarizes the hash, never your prompts. npx -y @forgemeshlabs/x402-notary-mcp

Local byte-wrangling toolbox: encoding (hex/Base64/Base32/Base58/Base45…), cryptographic + CRC hashing, base conversion, and CSPRNG tokens/passphrases, plus an opt-in Ethereum/EVM toolset (keccak, ABI/RLP codecs, EIP-191/712 hashing, function/event selectors, EIP-55). No network calls. uvx mcp-bytesmith.

Tamper-evident audit logs for AI agents: submit, fetch, and verify cryptographic proof bundles.

QRNG-seeded random bytes, seeds, and ML-KEM-768 keys with signed provenance receipts.

MCP server for Thales CipherTrust Manager integration, enabling secure key management, cryptographic operations, and compliance monitoring through AI assistants.

Post-quantum readiness for AI coding agents: scan code for quantum-vulnerable cryptography (RSA/ECDH/ECDSA/DH), explain the harvest-now-decrypt-later exposure, get NIST ML-KEM/ML-DSA/SLH-DSA (and hybrid) migration guidance, verify fixes, and check dependencies. Content-based/advisory tools only. Run local (npx @quantakrypto/mcp) or the hosted OAuth endpoint at mcp.quantakrypto.com.

Anchor a file's SHA-256 fingerprint to Bitcoin. The file never leaves the device.

Cryptographic audit trail for AI agents. Sign, verify, export. GDPR/HIPAA/EU AI Act.

Production-grade cryptography toolkit with 31 MCP tools for classical, PQC, and KMS workflows.

An MCP server that exposes hashlib functionality

Proof primitive for AI agents on MultiversX. Anchor file hashes on-chain as verifiable proofs.

Cryptographic identity for AI agents: W3C DIDs, Verifiable Credentials, post-quantum crypto

Zero-knowledge attestation for agent capability and trust score claims

DoI score lookup, vouch event builder, and offline schnorr verify for AI agents.

Bitcoin-anchored, trustless public verification ledger (JIDEC) for AI-agent evidence: fetch the record bytes, recompute the SHA-256, and check the OpenTimestamps/Bitcoin timestamp — no trust in the issuer required.

Local-first Base64, Luhn, key-component XOR, and synthetic ISO-0 PIN block tools.

Cryptographically sound randomness for agents, with verifiable commit-reveal.

Free, no-account verification of KeyHalve-sealed documents. Read-only; never receives keys.

Verifiable random decisions, audit sampling, fair selection, and proof verification using QnEvt.

Cryptographic proof of existence for AI agents. Base x402, NEAR anchored. Free tier.

Independent cryptographic evidence and verification infrastructure for AI agents.