How to generate a longer key?

To generate a longer symmetric key using OpenSSL, you can increase the number of bytes specified in the command. For example, to generate a 512-bit key (64 bytes), you would modify the command like this:

openssl rand -hex 64 > symmetric_key.hex

In this command:

• 64 specifies the number of bytes (64 bytes = 512 bits).

You can adjust the number to generate keys of different lengths as needed. If you have further questions or need assistance with anything else, let me know!