The time and effort required to break a security measure.

Work factor

Work factor - the time and effort required to break a security measure.

Incorrect answers:

Non-repudiation - involves associating actions or changes with a unique individual.

Session Key - is a single-use symmetric key used for encrypting all messages in one communication

session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or

multicast key which refers to any key used for encrypting messages, contrary to other uses like

encrypting other keys (key encryption key (KEK) or key wrapping key).

Payload - is the part of transmitted data that is the actual intended message. Headers and metadata

are sent only to enable payload delivery.