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A code-signing certificate connects a software publisher’s identity to a public key. It lets people and systems check who signed a software file and whether that file changed after signing. The certificate is only one part of code signing: it is not the private key, and a valid signature does not prove the software is safe.
What is a code-signing certificate?
It is a digital certificate used in software signing to bind a signer’s identity to a public key. A certificate typically contains identifying information and the public key, and a trusted party—often a certificate authority (CA)—digitally signs it to attest to that binding. See the NIST certificate glossary.
The certificate is not the private key used to create a signature. The signer uses the corresponding private key to sign software; a verifier uses the public key to check that signature. NIST describes a content-signing certificate as one issued to digitally sign information so its author can be confirmed and changes or corruption detected using a cryptographic hash. A signature certificate, in NIST terminology, is a public-key certificate containing a key intended for verifying digital signatures: content-signing certificate and signature certificate.
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- Establish the signer’s identity. In a CA-based workflow, the signer provides information for identity confirmation, and the CA issues a certificate that binds the signer’s identity to the public key. The private key should remain protected by the signer.
- Sign the software. The signer uses the private key to create a digital signature for authorized code. The certificate supplies the public-key identity information that helps a verifier interpret the signature.
- Verify the signature. A verifier checks the signature with the corresponding public key and checks whether the signed content has changed. NIST explains the relationship between keys and signatures in its digital-signature glossary.
- Optionally add a timestamp. NIST describes timestamping as a possible additional step in the signing workflow. Its precise behavior depends on the signing and verification system.
A CA is not the only possible trust arrangement. Without one, NIST says the public key must be distributed through a trusted out-of-band mechanism, so the verifier has a trustworthy way to associate that key with the signer. The general workflow is described in NIST’s May 2018 ITL Bulletin on protecting software integrity through code signing.
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What does a code-signing certificate prove?
When the signing and verification system is properly designed and operated, a verified signature can support two checks: that the signed code has not been modified since signing, and that it was signed using a key associated with the identified signer. NIST summarizes this as: “Digitally signing code provides both data integrity to prove that the code was not modified, and source authentication to identify who signed the code.” The statement appears in NIST’s Security Considerations for Code Signing, published January 26, 2018.
Does a code-signing certificate prove software is safe?
No. A signature identifies the signer and helps detect changes to signed code; it does not establish that the software is harmless, free of vulnerabilities, or appropriate to install. A trusted signer can still sign flawed or malicious code. Treat signature verification as one input to a security decision, not as a safety guarantee.
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What else must a secure code-signing system protect?
The certificate cannot compensate for weak control of the signing process. NIST’s guidance highlights controls around protecting signing keys and restricting which code is authorized for signing. If an attacker can use the private key or can get unapproved code signed, the certificate’s identity binding alone does not prevent misuse. NIST covers these system-level concerns in Security Considerations for Code Signing.
Where is code signing used?
Code signing applies to software artifacts in contexts including firmware, operating systems, mobile applications, and application container images. The specific requirements for issuing certificates, signing artifacts, and verifying signatures vary by platform and system; the general definition does not establish compatibility rules for any particular platform.
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