Code Signing

Code signing is a cryptographic process that digitally signs software, scripts, and executables to verify their authenticity and integrity. It assures users that the code comes from a trusted source and has not been altered or tampered with since it was signed.

Code signing uses public key infrastructure (PKI) to bind a digital certificate to a software artifact, enabling systems to validate the publisher and the trustworthiness of the code.

Unsigned or tampered software poses significant security risks, including malware injection, supply chain compromise, and loss of trust. Code signing:

• Ensures the origin of the code is verifiable
• Prevents unauthorized modifications or distribution
• Reduces false positives in endpoint protection tools
• Helps organizations meet compliance and platform requirements

Operating systems, browsers, and mobile app stores often block or flag unsigned code, making code signing essential for a smooth user experience and distribution.

1. Certificate Generation: A code signing certificate is issued by a trusted Certificate Authority (CA) to a verified entity (organization or individual).
2. Signing Process: The developer or build system uses the certificate’s private key to sign a code hash.
3. Metadata Embedding: The digital signature and publisher information are embedded in the binary or script.
4. Verification: When the code is executed or installed, the system checks the signature using the public key and verifies it hasn’t been altered.
5. Timestamping (optional but recommended): Attaches a trusted timestamp to preserve the signature’s validity even after the certificate expires.