Explanation
Trust zones can be implemented to separate systems or tiers along logical lines for great security and access controls. Each zone can then have its own security controls and monitoring based on its particular needs.

Explanation
In order to implement tokenization, there will need to be two databases: the database containing the raw, original data, and the token database containing tokens that map to original data. Having two-factor authentication is nice, but certainly not required. Encryption keys are not necessary for tokenization.
Two-person integrity does not have anything to do with tokenization.

Explanation
With international operations, systems ultimately cross many jurisdictional boundaries, and many times, they conflict with each other. The major hurdle to overcome for an organization is the lack of an ultimate international authority to mediate such conflicts, with a likely result of legal efforts in each jurisdiction.

IaaS entails the cloud customer installing and maintaining the OS, programs, and data; PaaS has the customer installing programs and data; in SaaS, the customer only uploads data. In a community cloud, data and device owners are distributed.