TLS Decoder

TLS Decoder analyzes TLS handshake data to reveal protocol version, cipher suites, certificate details, and session parameters. It targets developers, security engineers, QA teams, and researchers who analyze TLS configurations, verify interoperability, or investigate security incidents. The tool provides a structured view of handshake components, making it easier to verify configurations and diagnose failures.
Conceptually, the tool ingests raw data (hex, base64, or binary blobs), decodes TLS records, and maps them to fields defined by TLS standards. It extracts the server certificate chain, common attributes from certificates, and lists supported extensions and handshake messages. This enables quick verification of trust boundaries, algorithm choices, and interoperability between clients and servers.
A key value is automated parsing with robust error handling and export capability. It supports single or multi-record handshakes and can generate JSON or human-readable summaries for integration into CI pipelines or incident reports. The tool is designed to be non-intrusive and does not perform live network activity.
Typical use cases include security audits, protocol debugging, certificate validation, and research into TLS behavior. Professionals can reuse decoded outputs to compare configurations across environments, or to document compliance with internal security standards.