Where must tokens be secured prior to being issued?

Tokens must be secured prior to being issued to ensure their integrity and prevent unauthorized access. Storing them in a safe drawer is the most secure option because it provides a controlled environment where access can be limited to authorized personnel only. This ensures that the tokens do not get compromised or lost before they are formally issued to the designated individual.

In contrast, securing tokens at the TA's office, in a locked briefcase, or on the subscriber's device may introduce vulnerabilities. For example, while a locked briefcase might offer some level of security, it is not as secure as a safe drawer, which typically offers better protection against theft and unauthorized access. Similarly, storing tokens on the subscriber's device poses a risk because if that device is compromised, so are the tokens.

Thus, the environment in which tokens are stored is critical to maintaining their security before they are issued, and a safe drawer provides the highest level of protection.