Even though it was a violation of several regulations, and a capital offense at that, Lieutenant Hades couldn't resist immediately breaking the encryption and reading the message. It was addressed to First Officer
Lieutenant Hades could have arranged for the message to be "accidentally" lost or corrupted, before Khan got it; she could have also arranged for a copy to be diverted to Jellico as a warning. But, since the captain had not provided her with any recent "loyalty bribes", she felt no compulsion to protect or warn him. Of course, Khan hadn't given her a "loyalty bribe" this month either, so she allowed the contents of the message to leak out to the rest of the crew.
As soon as the other bridge officers realized that Hades was receiving a high-security message, they tried to catch a glimpse of her screen. She "accidentally" left the message on her screen while she bent over to pick up the earpiece that she "accidentally" dropped on the floor. Some of the officers managed to read the message, while the other officers managed to look up her short skirt. "By the time the next change of shift has occurred," Hades thought to herself, "every officer on the ship will be aware of Khan's orders, and positioning themselves to take full advantage of the change in command structure."
Noticing the way that some of the officers had studied her structure while she bent over, Hades began to make her own plans for how to keep occupied once the next duty shift took over the bridge. Many changes in position would be involved...
¹The mirror universe analog of Lieutenant Heavens, naturally.