Skip to content
Home » SIEM Tuning Insights » Demystifying Public And Private Keys Generation Suitable for TLS

Demystifying Public And Private Keys Generation Suitable for TLS

Private Key and public Key Generation Suitable for TLS

Public and Private key Generation

To create a new RSA public and private key pair in PEM format, you can use the openssl command-line tool. Here is an example of how to create a new RSA private key in PEM format:

openssl genrsa -out private.pem 2048

This command generates a new RSA private key with a key size of 2048 bits, and stores it in a file called private.pem.

To generate the corresponding public key, you can use the openssl rsa command:

openssl rsa -in private.pem -out public.pem -outform PEM -pubout

This command generates the RSA public key corresponding to the private key stored in private.pem, and stores it in a file called public.pem.

Both the private and the public keys are stored in PEM format. This PEM format is a widely used format for storing keys and certificates. PEM stands for “Privacy Enhanced Mail,” and it is a base64-encoded format that uses ASCII text for representing the binary data of the key or certificate.

PEM format is suitable for use with Transport Layer Security (TLS) protocols! TLS makes use of public key cryptography to secure communication over the internet. The private key and the self-signed certificate generated above to set up a TLS server, or to authenticate a TLS client.

Self Signed Certificate Creation

You can also use the openssl tool to create a self-signed certificate in PEM format. Here is an example of how to create a self-signed certificate using an RSA private key:

openssl req -new -x509 -key private.pem -out certificate.pem -days 365

This command generates a new self-signed certificate using the RSA private key stored in the private.pem file, and stores the certificate in a file called certificate.pem. The -days 365 parameter specifies that the certificate is valid for 365 days.

Key Conversions

You can also use the openssl tool to convert keys or certificates in other formats to PEM format. For example, to convert an RSA private key in DER format to PEM format, you can use the following command:

openssl rsa -in private.der -out private.pem -outform PEM

This command converts the private.der file from DER format to PEM format and stores the result in a new file called private.pem.

Consult the openssl documentation for more information on the various options and commands available for creating and managing keys and certificates in different formats.

Check out the devo parser documentation, or read about devo tagging.

Leave a Reply

Your email address will not be published. Required fields are marked *