[Applause]
good afternoon
how many of you would tell a
secret to a friend
using a megaphone in the middle of a
room so full of people like this
I suppose none because we all know
that if we did this the secret
it would cease to be a secret
I guess what we all wanted to be
and get close to that friend and tell him the
very low secret to the ear or well
send zeal using a mobile phone or
a computer
the question I want to ask you today is
in the latter case if we use media
electronic
we are sure that really the
secret comes only to our
friend or is that in that case we are
using a megaphone without realizing it is
good quiet that just to help us
in this case comes into play
Cryptography Cryptography is a
part of mathematics according to
mathematicians or a part of the
computing according to the informatics not
let’s fight noja that serves to
ensure safety
if we want to protect a secret the best
What we can do for this is to apply
over it a cryptographic algorithm of
way that the receiver to access the
content has to use a key
to decipher it
that’s just what happens in the
Most of our communications
electronic
what a priori might seem like a
little complex actually in general is
pretty simple and in fact it’s so
simple the idea that is below the
most used cryptographic algorithm
today I’m going to tell you now
with a small fire in the game of the
colors basically consists of that
we will be able to build a
shared secret using it
only public communications in
open
the first thing we need between
all choose a color a color like me
I propose to you that we use this
lovely yellow
then each of us the
we want to play we have to choose
our own secret color
I for example I’m going to choose this color
red as my secret color to you
pretend that they do not know because it’s my
secret color
then we have to mix the color as
with our own secret color of
way that I get this color
orange
this orange color is going to be my color
public vale
Well, if I want to play with some
of you in particular for example with
the gentleman here in the first row
it means
let’s imagine that he has done the same and
that you have obtained as your published color
this blue color what we have to do
next is to mix the color
public of the other with our own
secret color way that in my case
mixing its blue color with my color
red I get this beautiful violet color
the funny thing is that to him doing
Exactly the same thing will come out
exactly the same violet color and that
none of the others even know
our public colors is going to be
able to generate that same violet color
it seems magic truth well well where
is the grace this game so in what
that said through
public communications in open
we have been able to generate a secret
that is the essence of encryption more
used today but in that case
in the case of sitraunah used today
in day instead of using colors it is used
prime number already know those precious
numbers that are only divisible by
one or for themselves that’s why every time
that in the press cryptography is named
they always end up named the numbers
cousins does not fail the algorithm to which
I’m referencing is called rca and
40 years ago revolutionized the world of
the cryptography because until then
all the existing ciphers from the
very old encryption used by the
Emperor Julius Caesar up to the most
recent encryption that was implemented
between the enigma machines of the
Germans during the Second War
world
all those ciphers up to that moment
he demanded that the communicants
first of all he had to put on
agreement on what secret key they were going to
use to encrypt your communications
however one day there for years
seventy someone came up with a
idea and power of ideas did not decide
use a pretty property
interesting what the numbers have
cousins consisting of five objects
large prime numbers greater than
these appear here in the image
multiply it is very easy
however once multiplied
recover the starting prime numbers
factoring the result is no longer so
easy
it happens that we build that the more
big ones are harder to solve
that problem
this trick is used in cryptography of
way that multiplication is associated
to the process of encryption and factoring is what
What should I do
who wants to break the encryption but
really the most interesting thing about the rca
is not its use as encryption really what
most interesting of the rca algorithm is
which is used for other tasks
cryptographic as useful as
digital signature of documents
electronic or in authentication
for the secure control of accesses to
systems I do not suppose all of you
just as I am tired of being all
the day
memorizing and entering passwords
in all kinds of system, not the mobile
cashier computer internet checkbook
well for this there is a solution
that is also gaining ground
more and more that is based on the
desired and the idea that is below
that scheme is also simple that
I will tell you again with a game
this time something much shorter and
simple
remember the hoh where is wally
Well, I’m going to show you that I know
where is wally in a typical image
like this one but so that nobody is going to
find out where wally is saying
that none
is going to be able to pass for me in
this office that simple do not lose
track because I’m very very fast
Thank you
Well, right now he is sending
through the landmark woman
I do not know if they sell it to and propose the
picture above you see that through the
burrito looks wally and that’s because I
yes I know where wally is however
none find out where it is
for this and the game are ideas of
this simple game where you are
under the schemes that we use
many of us when we access from
secure way to system using
Smart card
At this point, they are
asking and is ingenious algorithm
really safe recipe is a good
question because we know there is a
collective of people interested in the
foreign secrets are dedicated to be
trying all day
break the cryptographic algorithms not
especially the most used as is the
case of the rca no I would say that to date
today making the numbers grow
cousins despite it is quite safe
quite safe however they say the
bad tongues that the rca has the days
counted
you do not know how many days or but they say
that are counted because there is a
community of the quantum community that
he has his eye cast on the recipe has
already prepared a break algorithm
total of the rca ready waiting for
build the first quantum computer
to implement that algorithm break the
rca and turn the world of
security as we know it
It is also true that they carry
promising that quantum computer
since the 90s when I started in
this issue and it has turned out that it is not
so easy that of the superposition of
been in a way that the pits not only
take values 0
not only that they can take at the same time
two values becoming kubis
but that ‘s another issue that we’re not going to
speak today the truth is that those
quantum computers when really
it replaces our classics
binary computers so that everything
change because immediately all the
cryptographic algorithms that we know
will be broken instantly
they will have to be replaced
immediate
that’s going to happen the rca and many others
cryptographic algorithms that
we could call imperfect
the question is to excite an algorithm that
be resistant quantum attack
Well, there is a resistant algorithm
a quantum bond quantum machines
any kind of attack because it’s
mathematically proven to be
unbreakable and will always be unbreakable
that algorithm is encryption is called
perfect encryption the successor of which
before it was called undecipherable encryption
which by the way was deciphered and also
in this case in the case of encryption
perfect
the algorithm is so simple that it’s going to
be the only one who counts here for it
we just need a way we take a
currency we are dedicated to launch the one and
again we produce those faces and crosses
like 0 and 1
then we have to use what to do to
encrypt is to add that binary sequence to
our message with two conditions that
the message also has to be
written in the binary language of the
computers and that the sum is a sum
binary say that one plus one zero
in this simple way there is no need to
count for more in this way so
simple we have defined an encryption
perfect an unbreakable cipher
maybe they are thinking about closing or not
because we decipher ourselves more than investing
encryption and decryption a sum to the
inverse of the sum we all know what
a subtraction but not clear the key is
in knowing that subtract never better said
it would be possible to get a good idea
launch the over and over again and get the
same binary sequence to be able
rescue her
well I will not say that it is impossible
because impossible is not
However, it is very unlikely
because the launch of a coin is
a random phenomenon and we already know that
the random has a whimsical little dot
by definition
this case is clear it did not occur to him
use this encryption to encrypt the
files on your computer because
they would automatically be kidnapped
carry it and could not recover
files by that because
normally we want to decipher what
we encrypt this perfect encryption is not used
in practice for however yes that
there is another encryption approaching
asymptotically to this perfect encryption
and that are used a lot in practice
in fact it is used almost right now to
almost all communications
encrypted wireless are called encrypted
in flow and I say they are coming
asymptotically to the perfect encryption
because the encryption in a simple sum and
the key is a binary sequence
also just that instead of using a
coin
we use a well-designed algorithm
well implemented to generate that
binary sequence that can be generated
again and again a sequence that in this
case is called pseudo random because it does not
It is random but it seems
I can not finish this homage that
I’m already giving the ciphers without at least
name the current standard figure said
I do not encryption current standard is called
this remains unbeatable after 20
years and each time more and more is used
because it is used on the secure internet
it is used in the victim’s version
ensures bluetooth are also used
it’s used in whatsapp and now it’s
use
Fashion ransomware viruses like pet
already and he will create what is not a
good news because that is very good
encryption
about this I want to give you and
give me all a piece of advice
we have to reset that’s why we are today
here we do not have to start
worry a little more about the
security of our system
computer and our phones
mobile phones because it is proven that
cybercrime is growing day to
day
It is proven that our privacy
every day they are more and more in danger
especially because of our improper use of
social networks and it’s proven
that cyberterrorism is being
little by little becoming the
terrorism of the future
before this apocalyptic world that ended
to define what solution I propose is the
solution that I propose is the same as
propose for almost all
world problems
the solution that I propose is the
training
I’m in security which translates as
it translates to how I’ve been with them
there are so many cryptographic algorithms
really very good and yet still
happening that the weakest link
is the user because it is the user who
click on links that should not click
it is the user who connects to
any crazy wifi open by
there the user who uses banking
electronics without worrying about whether
reaches until closed open and this
secure or unsecured page etc.
etc
and is that in safety our
The main enemies are not the hackers
of black hat that goes are not even
governments although many do things
that they should not do
not really in safety
Our main enemies are
ourselves
thank you very much
me
”
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