← Glossary
Glossary · Security Controls
Digital Signature
Cryptographic proof of authenticity and integrity using an asymmetric key pair.
A digital signature is produced with a private key and verified with the corresponding public key. In automotive, it is the authentication mechanism for OTA update packages, secure boot images, and high-trust diagnostic operations. Public-key trust is rooted in vehicle-OEM PKI.
Why it matters
Digital signatures are what let a vehicle trust software it did not build itself — OTA packages, boot images, and high-trust diagnostics all rest on them. The hard part is the PKI behind the keys; getting signing, verification, and key rotation right is a recurring requirement in both TARA and UNECE R156 update security.
Related terms
Message Authentication Code (MAC)
Short cryptographic tag that proves a message's origin and integrity to a receiver sharing a key.
Key Management
Lifecycle of cryptographic keys from generation through deployment, rotation, and revocation.
Secure Boot
Boot-time integrity check that an ECU only runs authenticated firmware.
Need help applying Digital Signature on a programme? Use the contact form or request a KAVACH demo.