Scylla Security Checklist
Scylla Auditing Guide
Enable Authentication
Enable and Disable Authentication Without Downtime
Generate a cqlshrc File
Enable Authorization
Role Based Access Control (RBAC)
Grant Authorization CQL Reference
Reset Authenticator Password
Encryption: Data in Transit Client to Node
Encryption: Data in Transit Node to Node
Generating a self-signed Certificate Chain Using openssl
Encryption at Rest
Also check out the Security Features lesson on Scylla University.