In order to understand how we can break out of Prison, we must first understand how the Prison operates, how the Guards spot means of Breakouts (Tools, Weapons), how they rotate their watch shifts; and how they generally behave and react to things that are going on inside the Prison.
The same applies for a Breakout of the Clearnet. In general, Internet Service Providers (ISPs) use a couple of techniques in parallel to make your experience of the Internet as bad as possible.
When we talk about how they operate, we must assume that the ISP is always the Man in the Middle (MITM) and can read, understand and manipulate any unencrypted data that is transferred between you, Alice, and Bob, the server that you're communicating to.
In general I'd recommend to use an up-to-date Linux Distribution for means of access of the internet. Network behaviour on MacOS and Windows cannot be guaranteed anyhow; therefore it is heavily disrecommended if you're serious about your Privacy.
And you should be, because Governments have lots of Exploits already available that are automatically installed on your Computer; no matter if you're the bad guy or a nice guy. They don't care.
General Hints for Dealing with Customs
There are a couple of rules on how to behave with Customs. Since a while ago they're looking for suspicious things, so while you're still under oath you can still plausibly deny what they're suggesting.
- Always use an up-to-date FULL Linux installation like Arch Linux .
- Always encrypt all your partitions with LUKS .
- Always use a small Nano USB thumbdrive as a crypto unlock keyfile in combination with a password.
- Always physically power down your Laptop and remove the battery and thumbdrive before going through Customs.
Additionally I'm using some special techniques that have been proven to
work so far. I also generated a custom
which removes the
Password Dialog and prints out nothing, while waiting in the background
for a password for 30 seconds until it boots up.
This way when I try to bootup the machine with Customs watching me, I can deny knowing about the Encryption of the HDD/SDD and can say that it was working before and that the Laptop is broken now.
If they don't see hints about a password, they ain't gonna ask you about it.
What's also very nice is when you travel with a Dog or Cat that comes with a Necklace. There are lots of Nano USB thumbdrives that perfectly fit in the Necklace of a Dog Tag or a Pet's name sign. Alternatively lots of people use thumbdrives hidden in a Wedding-Ring as I've seen.
Remember that an X-Ray scan will be done in case things go wrong, so
a Dog Tag can easily be denied and you can say it's something like a
Dog Tag with a GPS in it or you can hide the keyfile as a
that has your address in it.
Note that Customs has an NTFS-Stream detecting Forensics software, so the cheap tricks ain't working here and you gotta go the steganographic way with an audio or raw camera image file (the bigger the better). The Entropy gets better if you hide a keyfile within another file and make that file your keyfile.
If you can, you should use LibreBoot compatible Hardware, which means it is a bit outdated by modern performance standards though the benefits of the better UEFI replacement far outweight Customs having a Super Password to bootup your Laptop even when UEFI is locked.
In times of Bugs, Backdoors and Exploits in more modern Intel processors I'm quite happy with that decision.
You'll be amazed how often Customs will ask you whether your Laptop is broken or not when they cannot boot it up ... which should give you a hint that they unsuccessfully tried to invade your Privacy, and tried to install Spyware on your Computer without your permission.
The OSI Model
In order to understand how the Prison operates, you have to understand how the internet and its underlying network infrastructure works.
When talking about the Web, most people understand it as
, maybe even
but not nerdy things like IRC or ICMP.
Therefore this Guide will focus on the problems of
based internet connections.
When talking about Network Protocols, they are divided in different OSI layers which each add different capabilities to the network protocol. These days the lines in between blurr up a little, but the basic principles are the same.
The OSI Layers that are interesting to us are :
Physical Layerconnects machines via a transmission medium, like a network cable (or Wi-Fi or radio).
Data Link Layerlinks specific machines together, which are addressed via
MAC addresses(also known as hardware addresses).
Network Layerlinks specific network sockets together, which are addressed via
Transport Layerdefines the network socket data frames and its contents and mechanics (like
Session Layerdefines ids and temporary sessions. In our case this is only interesting for the
SOCKSproxy routing protocol.
Presentation Layerdefines encryption/decryption, for example an
Application Layeris the high-level network protocol that Applications work with, for example
Usually when network administrators talk about broken infrastructure, they tend to talk about which OSI layer is affected by the Bug. This helps them to identify the Bug more quickly and to trace down the broken Hardware or Firmware/Software.
A broken OSI Layer 1 means that a Network Hub or a Network Cable is broken. When OSI Layer 2 is affected, it concludes that a Network Switch or a piece of software (Firewall) that knows things about MAC and IP relationships is not working. When OSI Layer 3 is broken, it usually means that a Router or Gateway doesn't work as intended.
This goes on and on for each OSI Layer, in our case only these three layers are generally interesting when breaking out of the Clearnet (Censored Internet).
There are several ways on what is actually done in order to block as much "unwanted" Network Traffic as possible. Most of the time, only one of the following Hurdles is actually necessary; but most Governments have multiple ones in place to achieve maximum control of their Zombie inhabitants.
MAC Address Blocking (Layer 2)
In general, network connections are automatically tagged by ISPs. If they can see your MAC address, they'll also identify you by your MAC address. Many "Free Wi-Fi" Router Firmwares actually report the contents of their Network Address Translation Table (NAT) and therefore the MAC and IP addresses back to the ISPs.
That's why it's important to randomize your MAC address not only for Wi-Fi connections, but also for cable connections.
# Assumes enp3s0 is your cable connection sudo macchanger -r enp3s0; # Assumes wlp3s0 is your wifi connection sudo macchanger -r wlp3s0;
Deactivate all Wi-Fi autoconnect features in order to prevent being traceable by the Wi-Fi networks that your Wi-Fi card tries to ping when being disconnected.
Profiles, you can add these settings to your connection that is
Edit the file as
and not via
of the file identical. Otherwise NetworkManager
will forget the connection settings and mess things up.
; Generate mac-address via macchanger -sr wlp3s0 [connection] id=Example-WiFi (...) type=wifi autoconnect=false [wifi] mac-address=00:01:02:03:04:05 [ipv4] dhcp-send-hostname=false [ipv6] dhcp-send-hostname=false
TCP RST Injection (Layer 4)
TCP is a very nice Network Protocol, but it has an essential flaw which is called Fragmentation.
The underlying TCP data frame starts with a so-called
represents whether or not the data frame is
and can be
processed by the software that receives it.
flag is set to
, it means that the software will continue
to wait until new data arrives; and try to put the upcoming chunks together
when they arrive; into this big, locally maintained history of past
Additionally, TCP has a feature called
which is vulnerable to a
TCP reset attack
The important part here is not the attack scenario itself and that it kills the TCP connection, but the behaviour of the software using a TCP socket.
Generally software tries to recover from reset or timed out connections, so in the Web Browser scenario (producing the most internet traffic from an ISPs perspective) the network implementations will steadily try to reconnect and load the next part of the file with mechanisms like Partial Content or Range Requests .
All the ISP has to do to slow you down is listen for connections that
try to connect to a list of known CDNs or video delivery networks and
flags of that particular connection.
Usually they also time their attacks based on known software, so they
test against commonly known Browsers (read as "Blink", "WebKit" and "Gecko").
That means in the real world scenarios they just mess around the socket
for the first
until the actual payload arrives at the Client.
This might not seem long, but have you seen a Website and its resources
lately? Hundreds of resources easily multiply to half an hour per-refresh
where due to the
flag (and DNS which I'll explain later) local
caching is completely disabled.
This is exactly what happens on throttled "Flatrate" 3G/4G connections.
The bandwidth of HSPA+ or LTE is too fast to send just 48kiB/s (kiBi Bit),
so the ISPs use this technique to slow down to minimum speeds until all
software (read as Web Browser) breaks. Literally everything else like
based email client will break all the time and throw an absurd
amount of errors.
VPN Connections (Layer 2/4/7)
VPN connections that are based on TCP are also affected by the
flaw and therefore cannot be relied on as a stable transport layer.
VPN connections are auto-tagged and auto-throttled when they do connect to certain networks or IP ranges in specific geolocation areas.
If Sweden or Switzerland comes up via GeoIP the connection is usually off limits and is throttled to the max.
Additionally popular VPN providers usually are auto-blocked via an
IP-based blocklist which means that everything above
not work and they're basically just a big waste of money.
SOCKS Proxies (Layer 5)
SOCKS Proxies are a different story and they are hard to explain as a Network Protocol, because SOCKS itself is actually not a real network protocol but rather something like a connection delegation protocol.
What SOCKS does is basically have a
Client > Proxy > Server
whereas the Proxy itself can be abused for blocking purposes or as a
connection handler that sits in the middle.
A SOCKS Proxy can be imagined as the Telephone Operator Lady that you could call when you had no idea what the Number of the person was you were trying to call.
The function of a SOCKS Proxy is similar in the sense that it does the connecting and forwarding part when only the Proxy is reachable, but not the Server that you're trying to communicate to.
Anyhow SOCKS is unencrypted (below Layer 6) and therefore can be easily
manipulated, and connections can be blocked as well. That's why it's
just a matter of time before the new server pool behind projects like
won't work anymore.
SSL/TLS Certificate Injection (Layer 6)
Most people assume that when there's the Secure Icon in the Web Browser that it means the connection is secure, private, and safe.
Guess what, usually, you're wrong.
SSL was broken on uncountable accounts.
- Certificate Nulling Bug
- CCS Injection
- DER Attack
- X509 Policy Check Bug
... and that's just for starters.
The new all-new implementation is TLS (
Transport Layer Security
Web Browsers have realized that it's a good idea to deprecate everything
as fast as possible, so the current standard that I'm focussing on is
and only its specific attack vectors and exploitable bugs that
still work today; just for the sake of argument.
There are lots of other MITM attack scenarios for outdated banking websites, but they are honestly too much to count or remember. Just assume that banks want to support grandmas using IE6, so they use the weakest encryption possible because they're idiots.
That pretty much sums it up, especially in Germany or the European Union.
The 3SHAKE attack allows a malicious MITM to reuse the client's credentials to make intermediary requests to another third-party (or the same server) that uses the same credentials, which basically means an MITM scenario where Bob can make requests on behalf of Alice even when Alice disconnected from the server.
a TLS connection is downgraded
encrypted connection which is using weak Diffie-Hellman groups.
This will be fixed in
once it is released.
The FREAK attack abuses
Factoring RSA Export Keys
in order to trick
servers into negotating a connection with a previous version of TLS
which then will use cryptographically weak
This will be fixed in
by disallowing protocol downgrades,
but at the moment it's pretty much optional. So most real-world websites
are actually vulnerable.
This is in my opinion most likely what spy agencies are using in the wild.
The attack is called
Return Of Bleichenbacher's Oracle Attack
attack was initially discovered in
. Yes, freaking
1 9 9 8
Basically ROBOT allows to forge signatures so that the website that says it's Facebook actually isn't Facebook.
This will be fixed in
by disallowing insecure key transport
is considered unsecure, like, forever).
a timing attack against TLS up to and including
. This attack
already has been proven to work against
aka Amazon Web Services,
so it's pretty likely that this is in use in the wild, too. Oh, and it's
, so it's actually been a long time ago by now.
The BEAST Attack is primarily a client-side attack vulnerability in
so depending on your Operating System this attack might still work.
Yes, I'm looking at you, Apple and Microsoft, specifically.
The attack allows the attacker to obtain authentication credentials, session tokens or even authentication cookies, so it's the real deal in terms of "Is it actually being used?". You bet it is.
CRIME and TIME
Compression Ratio Info-leak Made Easy
attack allows to using a
side-channel attack against
. It analyzes information that is
leaked by TLS compression in messages sent from the client to the
server, so it can recover parts (if not all, given the attacker is
the actual MITM) of the unencrypted messages.
CRIME will be fixed in
by disabling TLS-level compression
completely. In the wild though, many, many, _many_ webservers still have
compression enabled, so they're vulnerable to this attack method.
is similar to
but it abuses
compression to read out a Client's session secrets.
In the Proof of Concept they were able to exfiltrate CSRF tokens, and
it works even with
and is effective against any cipher suite.
is above the TLS layer, TLS cannot ensure the prevention of
this attack method. Literally all servers that I've encountered have
compression enabled, so they're vulnerable to this attack.
TIME to HEIST
The HEIST Attack abuses
windows in order to steal encrypted HTTP
messages, specifically. This side-channel attack leaks the exact length
of the unencrypted messages of any cross-origin response, so the attack
does not actually allow to see the plaintext messages, but it allows
ISPs (aka MITM) to see what specific resource the client downloaded
from the website through a simple map of
byte length - URL
Note that this attack affects all
versions, and is also affecting
The attack is known among BlackHat DC visitors and very sophisticated but doesn't have a website, so you gotta download the heist-attack.pdf directly. The original paper is available at blackhat.com
initiative the usage
field got so popular that now ISPs are meanwhile regularly
abusing it to infiltrate encrypted connections on a large scale.
Server Name Identification
which basically allows
a web hosting provider to have a single server that has multiple domains
pointing to it; and that its software can deliver the correct encryption
certificate for the currently requested domain.
But, as you might have guessed,
unencrypted and lead to plain-old unencrypted DNS request for that very
As the DNS protocol is unencrypted, it lead to ISPs being able to manipulate that result; and therefore legitimize otherwise invalid certificates.
Always check for
and above; and assume that
below are insecure. As
and earlier is not really deprecated
it will continue to help exploit users for a long time to come and it
will take an even longer time to upgrade all those legacy websites
running on legacy software.
The only Browser that currently fixes all of the above issues is the Stealth Browser.
Yeah yeah, I know, shameless plug, but it's just so that you actively keep in mind that other Browsers aren't as secure as they claim to be; even when not talking about their always-active and not-really deactivateable tracking mechanisms.
DNS Time-To-Live Manipulation (Layer 7)
Even when your network connection is encrypted, your network might be
compromised. Your Computer doesn't understand what
means and needs a translation back to the underlying
Layer 2 with an
that represents that domain.
In order to do so, there's
. Probably one of the oldest Network
Protocols designed by ARPA. The important part here is that the
Network Protocol itself is unencrypted and that ISPs therefore abuse
and manipulate it.
Imagine you're an ISP and you want customer data insights about how much you can charge for an unlimited YouTube connection (yes, this is currently the case even in Germany, how's that for Net Neutrality).
In that case you need to know how many of your customers are surfing how often on YouTube (or the Google Video CDN domains).
What you, as an ISP, can do is pretty simple. The DNS Protocol has a
field inside it, which means that the receiving
Computer should forget about the Domain in
and Computers will gladly do so. ISPs abuse that and set the
in the response to
A visit of
then typically looks like this
Browser: DNS request with What is the IP of searx.me? Internet: DNS response with It's 188.8.131.52! Forget about it in 0 seconds! Browser: Gotcha, already forgotten. Browser: HTTP(S) request to website Internet: HTTP(S) response from website Browser: User clicks on link to searx.me/somethingsomething Browser: Damn, what was that IP again? Browser: DNS request with What is the IP of searx.me? Internet: DNS response with It's 184.108.40.206! Forget about it in 0 seconds! Browser: Gotcha, already forgotten. (...)
And this continues, again and again... again and again. So even if the ISPs don't know the exact data that was transferred, they can basically log all the domain requests and times (and bandwidths of that internet connection) and then correlate back with their own downloaded versions of the website.
HTTP Payload Manipulation (Layer 7)
An also quite popular mechanism of ISPs to infiltrate your connection is a so-called HTTP Downgrade Attack that works usually in Firefox or (not-so-recent) Chrome versions.
An HTTP Downgrade Attack is pretty simple. The Web Browser has a serious
It requests websites first via
and only then (optionally)
upgrades the connection to
- Connection: Upgrade + Connection: Downgrade
ISPs manipulate the very first request, and basically remove the
instructions inside the Response in order to
force the Web Browser into thinking that the Webserver only supports
This method is used at least in North Korea, Myanmar, Thailand and China (judging from personal travel experience). I've also seen it in some networks in eastern parts of Ukraine, but I'm not sure whether or not that was ISP or Public Wi-Fi specific.
Nevertheless this is the reason why HTTPS Everywhere should be mandatory for every Web Browser installation.
Breakout of Clearnets
Now that we know how the Prison operates and how the Prison Guards rotate their watch shifts and where they stand guard, we can now discuss the Tools we need in order to breakout of the Prison.
The follow-up article is Breakout of Clearnets and writes exactly about that.