Add a new rule to the ruleset, entitled Secrets:

Each Corp Name and Codename has a number of Secrets, which is tracked in the GNDT. For Corp Names this defaults to 5; for Codenames it defaults to zero.

Change the last paragraph of the rule entitled “Hacking” to read as follows:

If the Hack is successful, the Codename may reduce the Secrets of the Corp Name by 1 and increase their own Secrets by 1, as a Covert Action. They must then make a GNDT comment detailing the target of the Hack and its outcome, as a Covert Action. If the Hack is unsuccessful, then the Codename must lose one Subroutine of its choice from its Tool, as a Covert Action.