Which command is used to create a private key with 4096 bits?

Which command is used to create a private key with 4096 bits?

• A. ssh-keygen -t rsa -b 2048 -f user.key
• B. gcloud kms keys create
• C. openssl genrsa -out user.key 4096
• D. keytool -genkeypair

Answer: (C)

Creating a private key with 4096 bits means generating an RSA key whose modulus is 4096 bits long. OpenSSL provides a direct way to do this: openssl genrsa -out user.key 4096. This command explicitly requests an RSA private key of 4096 bits and saves it to user.key. The other options don’t meet the requirement: the first option uses 2048 bits, not 4096; the cloud KMS command creates a managed key in a cloud service rather than a raw private key file; and the Java tool creates a key pair for a keystore, not a standalone 4096-bit private key as specified.

Creating a private key with 4096 bits means generating an RSA key whose modulus is 4096 bits long. OpenSSL provides a direct way to do this: openssl genrsa -out user.key 4096. This command explicitly requests an RSA private key of 4096 bits and saves it to user.key. The other options don’t meet the requirement: the first option uses 2048 bits, not 4096; the cloud KMS command creates a managed key in a cloud service rather than a raw private key file; and the Java tool creates a key pair for a keystore, not a standalone 4096-bit private key as specified.