# X.509 certificate matches private key

In the context of cryptography, an X.509 certificate matching a private key refers to the relationship between the public key embedded in the certificate and the corresponding private key. These two keys are mathematically linked in such a way that data encrypted with one can only be decrypted with the other. When we say an X.509 certificate matches a private key, it means that the public key contained in the certificate can successfully decrypt data that was encrypted with the private key. This relationship is crucial for secure communication, as it allows the recipient of the certificate to verify the identity of the sender and ensure the integrity and authenticity of the transmitted data.