CyCon 2012 | Michael Schmitt: Tallinn Manual Part I

Global Affairs Academy
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Sep 5, 2026
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Video Summary
AI GeneratedThis presentation outlines the creation of the Tallinn Manual, a comprehensive restatement of existing international law as it applies to cyber warfare. Developed by independent experts under the sponsorship of the NATO CCDCOE, the manual provides a consensus-based framework for *jus ad bellum* and *jus in bello* to help navigate the legal complexities of cyber operations.
There's been a lot of talk about this manual in the corridors.
I thought I would spend some time telling you
about what has become known as the Tallinn Manual.
About 3 and 1⁄2 years ago, I got a phone call
from an Estonian named Anikin Tik asking me to come and speak
at one of these conferences.
She had been working with a friend of mine named Tom
Wingfield.
And my answer to her was, I'm not
interested in coming to any more of those boring conferences
on cyber.
We bring a bunch of lawyers together,
and they appear to impress the audience
by telling the audience how truly hard cyber is.
How about if we start answering the questions?
Call me again if you're ever ready to begin
answering the questions.
Well, she's a very entrepreneurial type person,
and I got a phone call a couple weeks later.
And the phone call basically said, we at the CCD
were ready to start answering these questions.
We'll give you as much money as you need in order
to answer the questions, and you can design your own group.
And so what we did is, about three years ago,
we set out, under the sponsorship
of the Native Cooperative Cyber Defense Center of Excellence,
to draft a manual on the law, the international law,
applicable to cyber warfare.
It's important to understand, as we talk about this,
it's the most important point, that this manual is not
a CCD COE product.
Laurie, the director, is here, and he's just
breathed a sigh of relief.
Nor is it a NATO product.
Nor, because I work for the Department of Defense,
is this a Department of Defense product.
This is a product that represents
the personal views of the participants that
were involved in the process, and nothing more.
It's 20 or so smart people who got together
that were tired of asking questions, and said,
let's take a shot at answering some of these questions.
So let me tell you about how we did that.
This manual was not the first of its kind.
You have heard the term San Remo Manual
on the Law of Naval Warfare used several times.
That was a 1995 project.
Professor Dr. Von Heinegg, we'll find someone Heinegg,
was instrumental in that.
There was a NIAC manual that was put out also by San Remo
that I did with Yoram Dinstein of Israel and Charles
Garraway of the United States.
And then most recently, there was a product
that was called the AMW Manual, Air and Missile Warfare Manual,
that was done by a group of 40 experts,
and then ultimately drafted by myself, and Wolf, Von Heinegg,
and Bill Boodby was involved in an outside way,
but very instrumental.
Jean-Francois Cunier from the ICRC,
who's hiding in the back row, was one of the drafters.
Arnie Dahl from Norway.
We all got together, and we drafted the commentary.
So we had a lot of experience in drafting
these sort of manuals, and we were committed to the idea
that this sort of manual would help.
And so we wanted to do a new manual
like those previous ones.
It is a restatement of the law.
It does not make law.
There is no effort to progressively develop the law.
This was an attempt to say, we now have cyber.
How does the law of Bellum and Inbello,
how does that body of law apply in the cyber context?
We struggled a great deal with what we wanted to cover,
and we felt that if we dealt with either domestic
or international criminal law, we would be biting off
more than we could chew.
There are some areas in the manual
that do not deal directly with Bellum,
which I spoke about yesterday, or Inbello,
which most of the speakers have spoken about today.
But the main focus is Bellum, Inbello.
How do we do this?
Well, we had a lot of experience in the group.
People like Wolf have been involved
in all these projects, and myself.
And so the very first thing we did
was we gathered a group of five people here in Tallinn,
and we said, what would the table of contents
of such a manual look like?
And we spent three days brainstorming
just a table of contents.
And then we spent a little time saying,
who are the best people in the world
that we think would form a cohesive group
to attack these problems?
Once we have identified what we thought
the table of contents would look like,
and I'll tell you a secret, the table of contents today
does not look like that, because over three years,
we've been thinking a lot.
Oh, that is an issue.
Oh, that's not an issue.
But once we identified the initial table of contents,
we contacted the experts and said,
we'd like you to work with us for three years.
We're not gonna pay you anything,
but you can come to Tallinn in January,
which is a very pleasant place then.
The group, and what we did was we divided up
the table of contents, and we gave each member
of this group of experts that agreed
to be in the project a list of topics.
And we said, draft a black letter rule,
what you think the law is,
and then draft a commentary on that.
All of the individuals came together
into an initial plenary where we looked
at the whole manual, and we kind of redesigned
the manual based on the input,
because we had experts that showed up
and said, golly, you gave me this topic,
but there's not much about this topic
that I could think of.
Sometimes we said, okay, it's out of the manual,
and sometimes we said, you haven't been thinking
hard enough, because I have an idea.
So we struggled, and then we sort of refashioned this,
and we sent everyone out to draft again.
They provided drafts again, and then those drafts,
and this was critical, those drafts were provided
to a small group composed of members
that did not include the person that drafted the stuff,
the material, because what I learned
in the AMW manual is that if a member drafted
a piece of the manual, they felt that was their baby,
and you just can't change it,
because I got it right the first time.
So we took control from the individual
who did the draft, and we gave it
to three or four other experts,
and they worked as a team to either polish it,
revise it, supplement it, and so forth.
These products were brought back into the plenary,
in other words, everyone, and then over a series
of eight three and four day meetings, we worked on it.
We focused mostly on what's called black letter,
I'll show you that in a moment,
because we wanted to make absolutely sure
we got the law right.
We talked about the commentary, which again,
I will show you in a moment some sample commentary,
but in the commentary, the goal was just
to kind of paint the picture for some folks
that would develop it later on,
but we nailed down what the black letter
looks like in plenary.
Every black letter rule reflects the opinion
of every single member of the group of experts.
There's no member of the group of experts
that objects to any statement of law
that we have in there.
After these sessions were met,
we then broke into a smaller group
called the Drafting Committee.
It consisted of a number of people in this audience,
Bill Boodby, Air Commodore Bill Boodby
from the RAF then, now a private scholar,
Professor Von Heinegg, myself,
there were some other people that were involved
and then moved on, Bruno Demmier,
who's currently with the ICRC on the Geneva Conference.
He was instrumental early on,
Tom Wingfield from the Marshall Center.
And then we had some technical experts
that were part of the small drafting group
because we knew we didn't understand cyber well enough
to do it alone.
They were instrumental,
they were with us every step of the way.
I will tell a quick story on myself.
I spent the first year, this is horribly embarrassing,
I'm the director of the world's major project on cyber law.
I spent the first year thinking the cloud
was like really up there, okay?
I mean, I really did.
I didn't think it was a cloud floating away.
I didn't wonder when the cloud went by,
is that where the cyber is?
But I did think that there were like these waves like radios
and then you just reach up
and you grab them out of the sky.
And then about a year into it,
finally one of the techies who spoke some language
that was incomprehensible to me finally got through to me
and I went, oh, and it makes a huge difference,
huge difference obviously in law
because of the principle of sovereignty.
So at any rate, they were with us
and they kept us honest throughout.
They explained when we were getting off track.
That editorial committee review is pretty much finished now.
We have sent that out to peer reviewers,
select individuals who are experts
in a particular area of the law.
They have looked at that and provided us feedback.
We've altered it and we will have a final plenary this July
here in Tolland because it's a Tolland manual obviously
and that's where the money is, Laurie.
That final plenary is for the purpose of saying now,
is everyone absolutely sure we got it right?
Because we're going final.
After that plenary, we'll make a few changes,
mostly Professor Von Heineggen and I
because we'll be working at the same place
and then we will send it to Cambridge University Press.
We will hang the manual on the CCDCOE website
and any other website that wants to hang the manual.
We're gonna do it at the War College
and then it will come out with Cambridge University Press.
My guess is in the December, January timeframe
if they keep up with the schedule.
Just wanted to show you the group of experts
where this was critical because we needed to pick people.
I've been through a number of these processes
and listen, the most important rule
is not to get the smartest people in the room
but you wanna get people that can play well together
because they're gonna be with each other
for a long, long, long time.
Robin is a member of the group.
I mean, Robin and I like each other
so when Robin says something to me,
even if I think it's crazy, if I respond to Robin,
Robin, that's ridiculous, you're a nut.
He doesn't take offense and run from the room.
He says, that's just Mike, let me rethink
and then we have a discussion.
So the number one criterion is to get people who were nice
but fortunately, there were lots and lots and lots
of brilliant, nice people around
and so then we picked people who we knew
were specialists in the field,
who really knew IHL or the usad bellum
in a very, very, very deep sense.
We also wanted to pick people who had practical experience.
We did not want this to be a group of eggheads
exploring the mysteries of the International Law Commission's
articles on state responsibility.
So you will see people like Jen Bernatchos
who spoke with you.
She is the director of international law
for the Canadians, for their military.
So we wanted to get people who had been there, done that,
have thought through these problems in a practical sense.
Now, in addition to the group of experts,
we had a group of observers,
Jean Francois is in the audience.
He was one of them early on.
A group of observers because we wanted to have
entities represented in the room
that could provide realism to how our customers would react.
And so the ICRC is a good example.
No one knows humanitarian law better than the ICRC.
Cyber Command, no one's doing this more than Cyber Command.
ACT, sponsor of the CCDCOE.
These folks participated in the process throughout.
Fully has members of the group of experts
except they did not get a vote.
So when you see a black letter rule,
that was adopted by every member of the group of experts,
but not, for example, by U.S. Cyber Com.
That is not U.S. Cyber Com's position.
They don't have a position on this particular issue
with regard to the manual,
but they were instrumental throughout.
Then we had a group of technical advisors.
Rain, you've met many times here at the conference
was one of them.
Ken Gears is here at the conference
who kept saying, listen, Mr. Potato Head,
that's not the way the world works in cyber.
And they've read the manual.
They provided examples to us and so forth.
And then after we finished,
I mentioned we had peer reviewers.
We went out to individuals
who we thought had particular expertise,
not in the overall subject, but in a particular area.
I'll give the example of my friend Charles Garraway
from the United Kingdom,
who's a real expert in detention.
So I said, Charles, can you look at the detention?
Tell us, did we get it right?
Have we missed anything?
And so forth.
There is a missing name,
and this is more embarrassing than I can even describe,
because among the peer reviewers,
there was one that stood out
because she actually worked with me in London
and subsequently here in Tolland
to polish parts of the manual,
spent days and days doing this.
And I forgot to put her name on the slide.
And she happens to be sitting not in the audience,
but at the table.
So I was going, it was Louise, who, God bless her,
was among the peer reviewers, clearly the giant.
And so I apologize, Louise, for that.
What are we looking at?
We looked at most of the stuff addressed in the conference.
Some issues that are not strictly ad bellum in bello
in the beginning.
Then we looked at ad bellum.
Then we looked at in bello.
And in in bello, we include the law of neutrality.
So we have chapters on each of these subjects
that are of varying length.
Content, I've mentioned, it's customary international law.
I emphasize that it is not lex lata,
or I'm sorry, not lex forenda, it is lex lata.
If you ask me what armed attack lex forenda is,
you'll get a different answer
than what we put in the manual,
because we ask, what is the law now?
It's good, August was the day we picked.
In August 2012, what's the law?
Not where is the law going?
That's what scholars provide about.
It includes international and non-international armed conflict
as well as customary international law,
because everything is customary.
But in supporting our customary conclusions,
methodology is often an issue when these manuals come out.
What we said was that it is customary law
or is applicable in NIAC or IAC.
In accordance with us, in other words, we are the authority.
We have 20 high-speed people here.
Through our years and decades of experience,
we are agreeing that this is customary.
We are agreeing this is applicable in IAC
or applicable in NIAC.
However, there were a number of sources
that were particularly influential for us.
Military manuals were, as they always are,
for example, in the customary law study.
We used four in particular for various reasons.
The one that was most important in a practical sense
was the US manual, not because it is the US manual,
but because the United States is not a party
to Additional Protocol 1.
So when you're trying to find customary law
and you go to the British manual,
you can't really decide, did they do this
because it's in Additional Protocol 1
to which they're a party,
or did they do this because they believe it's customary?
Is that why it's included?
The same with the Germans
and the same with our Canadian friends.
But the Americans,
they're not a party to Additional Protocol 1.
So if you see it in the manual, that's not decisive,
but it's at least some indication
that perhaps this is a customary norm
beyond being a treaty law norm.
And there were certain other sources
that were particularly authoritative
despite criticism of the ICRC customary law study.
Nevertheless, it proved absolutely invaluable.
We went back to the study again and again and again,
as evidence of custom,
and to look at their arguments
as to why something was custom.
We did not feel bound by the study,
but when the study was persuasive, we cited the study.
Of course, the Geneva Conventions
and Additional Protocol commentaries
because it told us what terms meant
by the people who did it.
The Air and Missile Warfare Manual and the NIAC Manual
because those are both restatements
of customary law as well.
Again, we weren't bound by those,
but it was persuasive evidence
because of the caliber of the people
that were involved in those projects.
We come up with two things in the manual.
We find two things, black letter law.
It's an American term, but it means the law.
This is the law.
They're usually short.
They're usually very, very broad
because remember they had to represent consensus
among the group.
The commentary is where you as professionals,
as practitioners, as scholars,
is where you will spend most of your time
because the commentary is extensive to each rule.
In the commentary, we try to identify
the source of the rule, where we got the rule from,
scope, international or non-international or both,
the meaning of the terms.
For example, if it says scale and effects in the rule,
then there will be commentary
on what the word scale and effects means.
We explain our logic and most importantly,
this is what distinguishes it from most other manuals.
Most importantly, we knew we were embarking
on a voyage into unknown territory.
We understood that.
People catch me in the hallway to tell me
how stupid it is to write a manual
before you've had an actual cyber war,
but we think it was important to do that.
Most importantly, the commentary reflects
every reasonable view that was expressed
among the group of experts.
So for example, in the last panel,
my friend Niels and I,
we don't entirely disagree over data.
The manual, that's what I'm looking at,
the manual as they go through,
the manual says there were two views
with regard to whether or not data can constitute
an object for the purposes of attack or military objective.
The first view was this,
and it is justified on this basis, the second view.
When we could, we identified majority and minority,
but sometimes it was not clear.
The group was split.
And so you as users in the state or ministry or a scholar,
this is not a manual that gives you one answer.
It is a manual that says here's a broad rule
everyone agrees on,
but in terms of the interpretation of this rule,
you can kind of go through and say,
that may have been the minority view
among that group of scholars,
but we in Israel,
we think the minority rule
is the accurate reflection of law.
So the most valuable aspect of this manual
is we did not try to come to consensus on everything.
We tried to lay out for the user
the various alternatives they had.
And we also sometimes simply said, it's unclear.
I don't know.
We thought about this and golly,
it's too hard for this group of 20 people.
Here's a sample of a rule
that actually was interestingly discussed yesterday,
Leveille en masse.
Initially, we thought Leveille en masse
has nothing to do with cyber.
However, when we thought about it, it did in fact.
You can see the rule is rather blah.
You know, Leveille en masse, the concept applies,
but then when you look into the commentary,
there's a fairly long commentary on Leveille en masse,
but here are just two paragraphs from the commentary.
See, it's from article 4A6, that source.
We affirmatively say it's customary law
and that it does not apply to non-international armed conflict
and we explain why it doesn't apply in the manual.
And then we do analysis in the cyber context.
We said, listen, this is hard in the cyber context
because it's about the population spontaneously rising up.
Well, that very well might happen,
but the whole population, like Mike Schmidt,
I'm not capable of spontaneously rising up
against any invader.
Why?
Because I wouldn't know how to fire a virus
if it fell down in front of me.
So we asked the question of,
does it mean the entire population
or does it mean the predominant part
of the cyber capable population?
And then there are many other issues
with regard to Leveille en masse
that are discussed in other paragraphs.
What were our toughest issues?
Use of force.
I discussed that in an answer
to my Israeli friend yesterday.
Use of force.
We never did come up with a bright line test
for what a use of force is.
So we came up with criteria that indicate a use of force.
Armed attack.
I spoke about that yesterday.
We came up with pretty much a consensus
on what an armed attack is,
but we're very sensitive to the fact
that we were trying to find the law today,
not seven years out.
As I told you yesterday,
I think that law will be different in seven years,
but it's not today.
Attack.
We had brutal, bloody battles.
Thank God we were friends
over the issue of what does an attack,
my presentation mean today.
However, I think in the last couple of literally weeks,
the ICRC and those who are on the other side
are coming to an accommodation
that the international law community will find acceptable.
So I think that was gonna be resolved by the manual.
Blockade was the hardest.
We have the world's blockade expert in the audience.
Is this where you get the chocolate?
I have 12 more slides.
We have the world's blockade expert
in Wolf Heinzelmann-Heinig.
I mean, literally the number one guy in the world there.
Of course, I don't want to put words in his mouth
that he was asserting there's such a thing as blockade.
We had another guy who said, you're crazy.
We never could resolve cyber blockade.
So there's a long commentary on it
and then say, we're not sure.
With regard to the law,
the last point before I get my box of chocolate is this.
We were only trying to set out to tell folks what we,
just this group of 20 people thought
was the law applicable in ad bellum and in bello.
But I have had any number of friends,
most recently the foreign and Commonwealth offices
legal advisor come up to me and say,
we're freaked out about the manual.
Because it gets everyone thinking of cyber stuff
in the use of force, armed conflict paradigm.
We don't want that to happen.
This is a manual that applies only
when you have ad bellum issues and in bello issues.
Don't have a cyber operation,
reach up there and grab the manual
and say the Talon manual will answer the question.
Because in most cases,
issues addressed in the Talon manual
are not relevant because you're not approaching
either the armed conflict threshold
or in the ad bellum sense,
the use of force or armed attack threshold.
So I don't want to have the problem,
if you have a hammer like the Talon manual,
every problem cyber operation is a nail.
Every situation is not ad bellum in bello,
be sensitive to human rights.
See Diana, I said that, be sensitive to human rights,
be sensitive to international criminal law
and the various things that Robin talked about.
Okay, now you can give me chocolate.
Oh no, okay.
