how-to-guide

How GitHub Webhook Signature Verification Works in Archon

April 10, 2026 coleam00/Archon ↗

Archon validates incoming GitHub webhooks by computing an HMAC-SHA-256 digest from the request payload and comparing it against the X-Hub-Signature-256 header using a constant-time comparison function.

Archon, an open-source automation framework maintained by coleam00, implements strict GitHub webhook signature verification to ensure that webhook events originate legitimately from GitHub and have not been tampered with in transit. This security mechanism relies on a shared secret (WEBHOOK_SECRET) configured by the user to cryptographically validate every incoming request before executing

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{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}

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