Which OpenSSL command is used to sign a certificate with a private key?

Which OpenSSL command is used to sign a certificate with a private key?

• A. openssl req -sign -key privkey.pem -out cert.pem
• B. openssl x509 -sign -key privkey.pem -out cert.pem
• C. openssl ca -sign -key privkey.pem -out cert.pem
• D. openssl sign -key privkey.pem -out cert.pem

Answer: (C)

The command used to sign a certificate with a private key is based on the functionality provided by OpenSSL. The correct answer utilizes the `openssl ca` command, which is specifically designed for signing Certificate Signing Requests (CSRs) and generating certificates within a public key infrastructure (PKI). When signing a certificate, the `openssl ca` command requires a configuration file to define the parameters and settings for the signing process, including the use of the private key. This command reflects the process of a Certificate Authority (CA) that signs certificates based on a CSR, validating the identity of the requester based on the information associated with the private key. The other options mentioned do not perform the signing process correctly according to OpenSSL standards. Some of them use commands or parameters that don't exist or are not intended for this specific operation, which emphasizes how the `openssl ca` command streamlines signing within a CA context. Understanding the specific roles of these commands is key to effectively managing and securing certificates within a network infrastructure.

The command used to sign a certificate with a private key is based on the functionality provided by OpenSSL. The correct answer utilizes the openssl ca command, which is specifically designed for signing Certificate Signing Requests (CSRs) and generating certificates within a public key infrastructure (PKI).

When signing a certificate, the openssl ca command requires a configuration file to define the parameters and settings for the signing process, including the use of the private key. This command reflects the process of a Certificate Authority (CA) that signs certificates based on a CSR, validating the identity of the requester based on the information associated with the private key.

The other options mentioned do not perform the signing process correctly according to OpenSSL standards. Some of them use commands or parameters that don't exist or are not intended for this specific operation, which emphasizes how the openssl ca command streamlines signing within a CA context. Understanding the specific roles of these commands is key to effectively managing and securing certificates within a network infrastructure.