Final answer:
Nonrepudiation prevents someone from denying access to a resource, generally through the use of digital signatures or logs, and is an important part of cybersecurity.
Step-by-step explanation:
The process that prevents someone from denying that she accessed a resource is called nonrepudiation. This term is used in the field of cybersecurity to describe a protocol or service that provides proof of the integrity and origin of data. Nonrepudiation can be achieved through the use of digital signatures, which ensure that a person cannot deny the authenticity of their signature on a document, or actions performed in a digital environment. For example, when a user signs an email with a digital signature, the recipient can be assured that the email truly came from the sender. Similarly, when a user accesses sensitive resources within an information system, logs, and tracking methods can be used to provide evidence of the access, which cannot be reasonably disputed by the user later on.