Dynamical passwords are parametric, dynamic, recoverable, generated on demand, pseudo random passwords, that are not stored in electronic or paper form. With dynamical passwords users and security managers will be able to find optimal trade-offs between convenience for users and a required security level. In this e-book, readers find answers to the following • How do you generate multiple, secure, recoverable passwords in a simple way? • How do you manage multiple passwords without saving them on computers or paper? • Why are online password managers more secure against brute force attacks than offline password managers? • Why are dynamical password generators more secure than online/offline password managers against hacking and brute force attacks? • How do you generate recoverable secure private keys for crypto wallets or data encryption with dynamical passwords?