Cliff Stoll’s DEF CON Talk
In August, Cliff Stoll gave a talk at DEF CON, remembering the wily hacker he stalked forty years ago.
Great fun.
In August, Cliff Stoll gave a talk at DEF CON, remembering the wily hacker he stalked forty years ago.
Great fun.
Hans Baeker • September 11, 2026 7:23 AM
Never mind. A quick search on youtube found the talk.
Thanks.
Kempton • September 11, 2026 7:41 AM
Cliff is just awesome! Without him, where would most of us be? Glad to see him well.
P.S. Bruce, did you know Cliff? And how early did you know him?
Weather • September 11, 2026 7:57 AM
I thought 40 years ago you had typewriters 😀.
Dialup internet, 128 lines, glory days.
Clive Robinson • September 11, 2026 9:11 AM
@ Weather,
With regards,
“I thought 40 years ago you had typewriters”
There were a few around but after 1973 they started disappearing as Personal Computers and dot matrix computers started taking over around 1977 with the Apple ][ doing “spread sheets” and early “Wordprocessing” then in the 1980’s 8bit micros for home computing kind of banged the nails in the lid of typewriters. With students writing their homework inside the editor that the command interface that BASIC provided.
But I suspect you don’t mean “typewriters” but “teletypes” hung of serial lines using either Baudot or from early 1960’s onwards RS232 [1]. These electromechanical beasts such as the KSR and ASR machines, gave us /tty in Unix device driver naming.
Untill not so long ago I still had one but “somebody made me an offer” so they could complete a working historical set piece for a museum display. The scary thing was I also provided boxes of consumables of paper rolls, ink tapes and 7hole punch paper tape…
[1] The electrical interface was +-80V for 5bit Baudot, and +-12V for 7bit RS232. One of the first development jobs I did in the Army unit was to design and build a “converter” based around a Z80 8bit CPU and a circuit not unlike small CP/M machines that also had a Texas TCM3105 modem chip with both a 4wire and 2wire interface so you could connect to just about any serial interface you would come across including “Post Office” lines (oh and VHF/UHF FM radios. Whilst I still have the CCT Diagrams and assembler listings, I don’t think I’ve still got a working unit in the loft scrap box, as I was later developing a MUX unit to connect several 75baud teletypes into a single line and needed some of the bits.
Oh the TCM3105 circuit diagram is a rip-off of an App-Note Data sheet very like,
‘https://freecircuitdiagram.com/521-bell-202-and-ccitt-v23-compatible-fsk-modem-circuit/
And yes the transformer is important otherwise the 2wire to 4wire conversion won’t work (technically if forms part of a balanced bridge circuit).
Clive Robinson • September 11, 2026 11:21 AM
@ ALL,
Whilst looking at Cliff Stoll’s somewhat “Mad Cap talk” on YouTube,
https://m.youtube.com/watch?v=656058JxTM0
You might also think about watching our Host @Bruce’s talk as well,
https://m.youtube.com/watch?v=eEBv0STiYhI
Not unexpectedly “late stage capitalism” and “lobbyist driven politics” gets in there… And reference is given to British SciFi Author Charlie Stross’ observation that,
“Capitalism is Slow AI”.
The thing people have to remember is that in this sense,
“AI is not the problem, it is merely the mirror to capitalist intent.”
Hence the reason for pointing out AI is in reality an “arms length authoritarian tool”.
Anonymous • September 11, 2026 12:10 PM
So according to fake Clive, places with higher life expectancy and happiness than us are “gone,” and the solution is to drag our life expectancy down even farther.
No arguing with that kind of genius.
KC • September 11, 2026 12:21 PM
Just fantastic!
An 1986 intl spy investigation that began with a $0.75 accounting error.
… with zero budget, zero expertise, and zero mandate lol
Love Cliff’s ‘recast’ questions for a three letter agency presentation. After a year on the case, god knows how many nights of missed sleep, and working on 12 pots of coffee the gargantuan lift is alive as ever!!!!
Dilbert • September 11, 2026 12:58 PM
I loved reading The Cuckoo’s Egg!
Clive Robinson • September 11, 2026 1:45 PM
@ Anonymous, ALL,
With regards your observation of,
“So according to fake Clive, places with higher life expectancy and happiness than us are “gone,” and the solution is to drag our life expectancy down even farther.”
Yup “fake-Clive” appears to have a sub-MAGA outlook on life. It’s the sort of thing you would expect from the likes of the “World Economic Forum” the sole purpose of which is to push,
“Enslavement by debt and rent”
With the only hope of escape being death before your pension does not pay you the price of a loaf of bread, let alone rent a roof to put over your head.
A century ago, it was thought that Capitalism was effectively dead… And whilst trade was essential for industry to survive (unless there was an active destruction of goods by warfare).
Somehow Capitalism survived and the price was high in terms of what the average person could earn thus buy. In order to maximise the extraction of money
“Goods were made cheap and not reparable.”
So you had to buy over and over (it’s one reason US house design is designed to last less than half a century, whilst in Europe a couple or three centuries is normal).
But the aim in the 1950’s when shoddy goods could not be sustained as a business model is what in the UK was called “On the never never” of “Hire Purchase” and later “non ownership leasing” which is in effect “fixed term rent”.
DMCA 1201 has in effect now made everything “fixed term rent” as everything has a computer in it.
The remaining trick the WEF and US State Dept are working towards is
1, You can not own anything.
2, Anything you create belongs to a corporation in some way.
The latter can be seen by the “AI Surveillance” of Microsoft etc and the IP theft of creativity by OpenAI, Anthropic etc.
As has been pointed out in the past US Style Capitalism being forced into the global economy is actually a death sentence not just for what many think is capitalism, but those who think it.
A book that details this is reviewed at,
But it’s conclusion is not that far away from your second observation of,
“No arguing with that kind of genius.”
Interestingly some US citizens are now talking about “socialism” just as it’s veing killed of in Europe by the actions of the US State Department and the past few Executives.
That $5000 the Trumper promised voters the night before last is very probably like all “Politician’s Promises” fairly worthless.
But consider if it were to happen what it would do to,
1, US Inflation.
2, US National debt interest.
None of that would be of any benefit except to those who hold assets they rent to those without assets.
Marian • September 12, 2026 4:29 AM
There can’t be more than ten persons alive that can get away with running over time at DEFCON and be cheered for that!
Rontea • September 12, 2026 10:16 AM
Awesomeness! Thanks for posting this Professor Schneier.
Weather • September 12, 2026 12:07 PM
@All
I was 5 years at the time, i can remember me at a friend trying to hack a town library at that day, one thing i did find out later, disconnect a node off a token ring network, all the computer crash.
And telling my friend there’s more books out a fire escape door ,with the corsponeding alarm going off.
Now thinking back, i never did go to that library again, they might have thought i was a son of Satan:)
Billy Jack • September 14, 2026 7:31 AM
Weather: “And telling my friend there’s more books out a fire escape door ,with the corsponeding alarm going off.”
When I was in graduate school in the 1970s, I noticed that the library seemed to have some kind of metal detectors to cut down on disappearing library books.
One day I checked out this one book that was really thick. Being that thick, there was a noticeable gap in the spine when you opened the book and you could see some kind of metal strip inside. So I took it out. When I took it back to check in, the student worker ran it across some kind of object, looked at it frowning, and said that they must have missed that one. So she set it aside to replace the strip later.
I went back to the math department and told a couple of friends about it. That Friday or Saturday night two of us went to the library, found a really thick book, and removed the strip. We then wadded it up and stood near the a passageway that you needed to go through to go to the front desk and out the door.
After a minute or two, two girls walked by wearing sweaters with hoods on them. We tossed the wadded up strip in one of their hoods and watched with anticipation. Sure enough, as they went through the door, they set off the alarms. With no guilty conscience, they just kept walking without even noticing the alarm. It was a big disappointment.
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Hans Baeker • September 11, 2026 7:21 AM
I remember reading “The Cuckoo’s Egg” shortly after it came out.
That would have been an interesting talk. Is it available on-line anywhere?