Trusted Extensions software does not leave labeling up to the discretion of computer users. All printer output from print servers that are configured with Trusted Extensions is automatically labeled according to the site's requirements.
Even though security was not yet fully understood at the company, executives knew that Trusted Extensions could implement certain features immediately.
Automatic labeling of print jobs
Printers with restricted access by label
Email with restricted access by label
Each print job is automatically assigned a label. The label corresponds either to the level at which the user is working or to the user's level of responsibility.
Figure 6–1 shows an employee working at a level of INTERNAL_USE_ONLY. At this level, the work should only be accessible by SecCompany employees and others who have signed nondisclosure agreements. When the employee sends email to the printer, the print job is automatically assigned the label INTERNAL_USE_ONLY.
The printer automatically prints a company-specified label at the top and bottom of each page of printed output.
This example shows the wording for a print job whose sensitivity level has a classification of NEED_TO_KNOW and a department of HUMAN_RESOURCES. Banner and trailer pages are automatically created for each print job and are printed with company-specific handling guidelines.
NEED_TO_KNOW HR DISTRIBUTE ONLY TO HUMAN RESOURCES (NON-DISCLOSURE AGREEMENT REQUIRED)
Printed below the sensitivity label, handling instructions provides distribution instructions for the printed material. The instructions state that the information should be distributed only to human resources personnel who need to know the information. Also, a reader must have signed a nondisclosure agreement.
Printers can be configured to print only jobs with labels within a restricted label range. For example, Figure 6–3 illustrates that the legal department's printer has been set up to print only jobs that have been assigned one of three labels:
NEED_TO_KNOW LEGAL – Can be viewed only by employees with a need to know within the legal department
INTERNAL_USE_ONLY – Can be viewed only by permanent employees of the SecCompany company and customers who have signed nondisclosure agreements
PUBLIC – Can be viewed by anyone
This printer setup excludes jobs that are sent at any other label. For example, this printer would reject jobs at the labels NEED_TO_KNOW MARKETING and REGISTERED.
Printers in locations that are accessible to all employees can be similarly restricted. For example, printers can be configured to print jobs only at the two labels that all employees can view, INTERNAL_USE_ONLY and PUBLIC.
Similar to how the printer label range controls which jobs can be printed on a particular printer, a user's account sensitivity label range limits which email the person can handle. Figure 6–4 shows email that is being labeled at the sensitivity label of the user's mail application. The email is sent to the mail application at that label.
Gateways to the Internet were set up to screen email so that emails at inappropriate labels could not be sent outside of the company. Inappropriate labels are any labels except PUBLIC.