Description: Ownership authentication is a method of authentication that verifies the possession of a specific device or token by the user. This approach is based on the premise that only the legitimate owner should have access to a resource or system, using an element that is exclusive to them. Devices or tokens can include anything from mobile phones, smart cards, to hardware devices like USB keys. Ownership authentication is considered one of the layers in multifactor authentication, which combines different methods to enhance security. This type of authentication is crucial in a digital environment where cyber threats are becoming increasingly sophisticated. By requiring a physical element that the user must possess, an additional barrier against unauthorized access is added, making this method highly effective. Ownership authentication is commonly used in conjunction with other methods, such as knowledge-based authentication (passwords) and biometric authentication, to create a robust and reliable security system.