It is a broad field. Any type of network provider—X.25, cellular phone or large Internet provider. Computer vendors—the manufacturers of software and hardware, routers, gateways, firewalls or phone switches. Military institutions, governments and banks seem to be a little less fashionable these days, though there are still plenty of attacks on these sorts of sites.
Attacks on security experts are still common, but a new trend is the increase in attacks on other hackers' systems. One Australian hacker joked, `What are the other hackers going to do? Call the Feds? Tell the AFP, "Yes, officer, that's right, some computer criminal broke into my machine and stole 20000 passwords and all my exploitation code for bypassing firewalls".'
For the most part, elite hackers seem to work alone, because of the well-advertised risks of getting caught. There are still some underground hacking communities frequented by top hackers, most notably UPT in Canada and a few groups like the l0pht in the US, but such groups are far less common, and more fragmented than they used to be.
These hackers have reached a new level of sophistication, not just in the technical nature of their attacks, but in their strategies and objectives. Once, top hackers such as Electron and Phoenix were happy to get copies of Zardoz, which listed security holes found by industry experts. Now top hackers find those holes themselves—by reading line by line through the proprietary source code from places like DEC, HP, CISCO, Sun and Microsoft.
Industrial espionage does not seem to be on the agenda, at least with anyone I interviewed. I have yet to meet a hacker who has given proprietary source code to a vendor's competitor. I have, however, met a hacker who found one company's proprietary source code inside the computer of its competitor. Was that a legal copy of the source code? Who knows? The hacker didn't think so, but he kept his mouth shut about it, for obvious reasons.
Most of the time, these hackers want to keep their original bugs as quiet as possible, so vendors won't release patches.
The second popular target is source code development machines. The top hackers have a clear objective in this area: to install their own backdoors before the product is released. They call it `backdooring' a program or an operating system. The word `backdoor' is now used as both a noun and a verb in the underground. Hackers are very nervous discussing this subject, in part because they don't want to see a computer company's stock dive and people lose their jobs.
What kind of programs do these hackers want to backdoor? Targets mentioned include at least one major Internet browser, a popular game, an Internet packet filter and a database product used by law enforcement agencies.
A good backdoor is a very powerful device, creating a covert channel through even the most sturdy of firewalls into the heart of an otherwise secure network. In a net browser, a backdoor would in theory allow a hacker to connect directly into someone's home computer every time he or she wandered around the World Wide Web. However, don't expect hackers to invade your suburban home just yet. Most elite hackers couldn't care less about the average person's home computer.
Perhaps you are wondering who might be behind this sort of attack. What sort of person would do this? There are no easy answers to that question. Some hackers are good people, some are bad, just like any group of people. The next generation of elite hackers are a diverse bunch, and relaying their stories would take another book entirely. However, I would like to introduce you to just one, to give you a window into the future.
Meet SKiMo.
A European living outside Australia, SKiMo has been hacking for at least four years, although he probably only joined the ranks of world-class hackers in 1995 or 1996. Never busted. Young—between the age of 18 and 25—and male. From a less than picture-perfect family. Fluent in English as a second language. Left-leaning in his politics—heading toward environmentally green parties and anarchy rather than traditional labour parties. Smokes a little dope and drinks alcohol, but doesn't touch the hard stuff.
His musical tastes include early Pink Floyd, Sullen, Dog Eat Dog,
Biohazard, old Ice-T, Therapy, Alanis Morissette, Rage Against the
Machine, Fear Factory, Life of Agony and Napalm Death. He reads
Stephen King, Stephen Hawking, Tom Clancy and Aldous Huxley. And any
good books about physics, chemistry or mathematics.
Shy in person, he doesn't like organised team sports and is not very confident around girls. He has only had one serious girlfriend, but the relationship finished. Now that he hacks and codes about four to five hours per day on average, but sometimes up to 36 hours straight, he doesn't have time for girls.
`Besides,' he says, `I am rather picky when it comes to girls. Maybe if the girl shared the same interests … but those ones are hard to find.' He adds, by way of further explanation, `Girls are different from hacking. You can't just brute force them if all else fails.'
SKiMo has never intentionally damaged a computer system, nor would he. Indeed, when I asked him, he was almost offended by the question. However, he has accidentally done damage on a few occasions. In at least one case, he returned to the system and fixed the problem himself.
Bored out of his mind for most of his school career, SKiMo spent a great deal of time reading books in class—openly. He wanted to send the teacher a message without actually jacking up in class.
He got into hacking after reading a magazine article about people who hacked answering machines and VMBs. At that time, he had no idea what a VMB was, but he learned fast. One Sunday evening, he sat down with his phone and began scanning. Soon he was into phreaking, and visiting English-speaking party lines. Somehow, he always felt more comfortable speaking in English, to native English-speakers, perhaps because he felt a little like an outsider in his own culture.
`I have always had the thought to leave my country as soon as I can,' he said.
From the phreaking, it was a short jump into hacking.
What made him want to hack or phreak in the first place? Maybe it was the desire to screw over the universally hated phone company, or `possibly the sheer lust for power' or then again, maybe he was simply answering his desire `to explore an intricate piece of technology'. Today, however, he is a little clearer on why he continues to hack. `My first and foremost motivation is to learn,' he said.
When asked why he doesn't visit his local university or library to satisfy that desire, he answered, `in books, you only learn theory. It is not that I dislike the theory but computer security in real life is much different from theory'. Libraries also have trouble keeping pace with the rate of technological change, SKiMo said. `Possibly, it is also just the satisfaction of knowing that what I learn is proprietary—is "inside knowledge",' he added. There could, he said, be some truth in the statement that he likes learning in an adrenalin-inducing environment.
Is he addicted to computers? SKiMo says no, but the indications are there. By his own estimate, he has hacked between 3000 and 10000 computers in total. His parents—who have no idea what their son was up to day and night on his computer—worry about his behaviour. They pulled the plug on his machine many times. In SKiMo's own words, `they tried everything to keep me away from it'.
Not surprisingly, they failed. SKiMo became a master at hiding his equipment so they couldn't sneak in and take it away. Finally, when he got sick of battling them over it and he was old enough, he put his foot down. `I basically told them, "Diz is ma fuckin' life and none o' yer business, Nemo"—but not in those words.'
SKiMo says he hasn't suffered from any mental illnesses or instabilities—except perhaps paranoia. But he says that paranoia is justified in his case. In two separate incidents in 1996, he believed he was being followed. Try as he might, he couldn't shake the tails for quite some time. Perhaps it was just a coincidence, but he can never really be sure.
He described one hacking attack to me to illustrate his current interests. He managed to get inside the internal network of a German mobile phone network provider, DeTeMobil (Deutsche Telekom). A former state-owned enterprise which was transformed into a publicly listed corporation in January 1995, Deutsche Telekom is the largest telecommunications company in Europe and ranks number three in the world as a network operator. It employs almost a quarter of a million people. By revenue, which totalled about $A37 billion in 1995, it is one of the five largest companies in Germany.
After carefully researching and probing a site, SKiMo unearthed a method of capturing the encryption keys generated for DeTeMobil's mobile phone conversations.
He explained: `The keys are not fixed, in the sense that they are generated once and then stored in some database. Rather, a key is generated for each phone conversation by the company's AUC [authentication centre], using the "Ki" and a random value generated by the AUC. The Ki is the secret key that is securely stored on the smart card [inside the cellphone], and a copy is also stored in the AUC. When the AUC "tells" the cellphone the key for that particular conversation, the information passes through the company's MSC [mobile switching centre].
`It is possible to eavesdrop on a certain cellphone if one actively monitors either the handovers or the connection set-up messages from the OMC [operations and maintenance centre] or if one knows the Ki in the smart card.
`Both options are entirely possible. The first option, which relies on knowing the A5 encryption key, requires the right equipment. The second option, using the Ki, means you have to know the A3/A8 algorithms as well or the Ki is useless. These algorithms can be obtained by hacking the switch manufacturer, i.e. Siemens, Alcatel, Motorola …
`As a call is made from the target cellphone, you need to feed the A5 key into a cellphone which has been modified to let it eavesdrop on the channel used by the cellphone. Normally, this eavesdropping will only produce static—since the conversation is encrypted. However, with the keys and equipment, you can decode the conversation.'
This is one of the handover messages, logged with a CCITT7 link monitor, that he saw:
13:54:46"3 4Rx< SCCP 12-2-09-1 12-2-04-0 13 CR
BSSM HOREQ
BSSMAP GSM 08.08 Rev 3.9.2 (BSSM) HaNDover REQuest (HOREQ)
———-0 Discrimination bit D BSSMAP
