There is no legitimate tool called a "Cisco ASA license key generator." Cisco ASA (Adaptive Security Appliance) licenses are legally tied to the hardware's serial number and must be obtained through official Cisco channels.
Some features, like the "Strong Encryption" (3DES/AES) license, are free but must be "purchased" for $0 on the Cisco website to comply with export controls. 2. Generate the Activation Key Log in to the Cisco License Registration Portal Locate your Serial Number by running the command show version on your ASA CLI. Enter your PAK and the ASA Serial Number. Cisco will generate a multi-character Activation Key cisco+asa+license+key+generator+install