Imperial Hyperspace Security Net The Imperial Hyperspace Security Net was an overlapping network of hyperspace disruption technologies used by the Galactic Empire to control hyperspace traffic through the Deep Core . As a response to Rebel hit - and - run attacks on Imperial convoys and worlds , the Security Net was installed across common hyperspace routes throughout the Deep Core to give Imperial strongholds advanced warning of approaching enemy fleets . The Security Net utilized non - mass hyperwave transceivers emitting cross - channeled radiation to detect incoming starships traveling through hyperspace . Once a starship was detected , gravity well projectors were brought online to drop the ship out of hyperspace and prevent it from escaping . The ship then had to present the proper registration code to the local planetary security forces or else be fired upon by surrounding Imperial ships . Emperor Palpatine ' s fortress world Byss was one of the many Imperial planets that used the Security Net during the Empire ' s resurgence in 10 ABY . After the Dark Lord Darth Krayt ' s usurpation of the Imperial throne in 137 ABY , the Security Net was expanded to include the Core Worlds and utilized space stations strewn across common hyperspace routes to monitor hyperspace traffic . Description . The Imperial Hyperspace Security Net was a system of gravity well projectors and non - mass HoloNet transceivers utilized as an early warning system by the Galactic Empire to detect starships entering the Deep Core . The Security Net was able to give Imperial star systems — and with some refinements , starships — in the Deep Core advanced warning of ships approaching through hyperspace . It was able to do this by using a system of non - mass hyperwave transceivers , originally developed for the HoloNet to pass communications in specific frequencies , linked by a network of coordinated S - thread s . The transceivers projected cross - channeled radiation , which registered a hyperspace disturbance whenever a ship passed through it . The transceivers were able to detect these disturbances at cosmically short distances and signal the gravity well projectors to drop incoming ships out of hyperspace . Gravity well projectors served as the backbone of the Security Net , creating artificial mass shadows that pulled ships into realspace and prevented them from escaping . Sometimes gravity mines or Interdictor cruisers were used in place of , or in addition to , gravity well projectors . Once a ship was pulled out of hyperspace , it had to present proper authorization to Imperial Customs officials or else be fired upon by any surrounding Star Destroyers and support craft . All ships wishing to pass through the Security Net had be registered with the Bureau of Ships and Services and have Imperial Security Authorization and Imperial Intelligence Clearance . Security Net technology was incredibly bulky and expensive . Sections of the Security Net could have been built around systems , but practically they only covered the most common hyperspace entry routes . Even then , the Security Net had the potential to have many holes in it and thereby be subverted through the use of experimental routes . Some transceivers were outfitted with hyperdrives and navigation computers , allowing them to randomly jump from point to point and cover more space . Ships unaware of the jump patterns of these transceivers often found it difficult to penetrate the Deep Core Security Zone undetected . Any system using the Security Net often rounded out its security with patrol vessels , asteroid mines , antimatter particles , and probe droids . By 137 ABY , use of the Security Net had branched out to include the Core Worlds . In addition to gravity mines and Imperial Navy flotillas , the updated Security Net consisted of space stations placed along common hyperspace routes where random inspections were performed on ships entering and leaving the Deep Core and the Core Worlds . History . The Imperial Hyperspace Security Net was constructed in response to surprise ambushes on Imperial convoys and planets by Rebel Alliance ships . Alliance tacticians such as General Jan Dodonna and Admiral Ackbar perfected the use of hit - and - run skirmishes on Imperial ships through careful use of the hyperdrive , forcing the Empire to stop sending out unarmed transports . Full - scale Alliance fleets dropping out of hyperspace also had the potential to devastate key locations on an Imperial world before planetary defenses were able to be brought online . The Security Net was installed throughout the Deep Core to give Imperial worlds advanced warning of approaching enemy fleets . The technology used to create artificial gravity wells was developed after an accidental discovery by Imperial scientists in the Sedri system . The scientists discovered that it was possible to create an artificial gravity well , and though their mission in the system was foiled by agents of the Rebellion , the scientists learned much . After several months of research , they were able to learn how to create an artificial gravity well on their own . Gravity well generators were soon installed on the Empire ' s newly constructed Interdictor cruisers and , eventually , were used in the Security Net . The introduction of this technology caused the Rebels to become more cautious about attacking Imperial convoys and worlds . The Security Net was soon installed around Imperial planets in the Deep Core such as the fortress world Byss . The Security Net was not without its weaknesses , however . When the Trade Federation lost control of the Deep Core world Vulpter after the formation of the Empire , the shipping of foodstuffs to the planet was halted due to the Empire ' s anti - alien bias . Vulpter , cut - off from the rest of the galaxy after the establishment of the Deep Core Security Zone , became a safe haven for Rebels and criminals who were able to bypass the Security Net . Although Galactic Emperor Palpatine wished to conceal the Deep Core from the rest of the galaxy behind a veil of secrecy through its inaccessibility , he still needed supplies and troops brought into the region . Deep Core hauler s , freighter captains hired by the Empire , carried out this task and were some of the few individuals outside of the Empire given clearance to pass through the Security Net . One of these Deep Core haulers was Salla Zend , a smuggler whose freighter , the " Starlight Intruder " , was licensed to transport goods beyond the Security Net to Byss . After Palpatine ' s resurrection in 10 ABY , Zend attempted to smuggle her old flame , Han Solo , along with his wife , Leia Organa Solo , into Byss to rescue Organa Solo ' s twin brother , Luke Skywalker . " En route " to Byss , the " Intruder " was followed by the bounty hunter Boba Fett , who intended to collect a bounty on Solo . Thanks to the Security Net , Byss Security was able to track the " Intruder " as it exited hyperspace and allowed it safe passage through Byss ' s planetary shield . Byss Security also noticed Fett ' s approach right behind the " Intruder " and , after receiving no authorization from him , was able to close the planetary shield quickly , causing Fett ' s ship , " Slave II " , to crash into it with devastating effects . At some point , the pirate Grinner wrote a memo about smuggling opportunities within the Deep Core , claiming that the Security Net made it incredibly difficult to make runs through the area . By 137 ABY , the Security Net had expanded to include the Core Worlds . With the addition of space stations along hyperspace routes , the Empire , now controlled by the One Sith under the Dark Lord Darth Krayt , was able to perform random inspections on starships and stop attacks against protected planets . Behind the scenes . The Imperial Hyperspace Security Net was first mentioned in Tom Veitch ' s endnotes from the of the 1991 – 1992 comic book series " Dark Empire " . It first appeared in the of " Dark Empire " , as well as the comic ' s audio adaptation . The Security Net was first detailed in West End Games ' " Dark Empire Sourcebook " and later in several Wizards of the Coast sources such as " Byss and the Deep Core " and the " Legacy Era Campaign Guide " .