What is an alarm with a dialogue code. Dialogue alarms - what is better? Principle of operation, algorithm in simple language What is an alarm with a dialogue code

Let's start as usual with the backstory! Often on the forums there are such interesting phrases "Take the XXX alarm. Everything works fine for me for a year" and on the other hand "I have the same XXX alarm, they hacked in the parking lot, pulled out the money and the navigator and put it back on guard." So what's the problem? And what is the dialogue code they are talking about last years so much? Why are installers sometimes so reluctant to install and hold on to their usual alarms? We even singled out a separate section for dialogue alarms in our store, and it would seem that everything is simple, dialogue alarms are currently the most crypto-resistant ... but in practice, everything is not so simple, many do not believe, many say that this is a publicity stunt, and some never heard of dialogue alarms! So, the idea of the article appeared, he (the director) said let's go, he waved his hand...

Let's start with theory! What is a car dialogue alarm?

A car dialogue alarm is an alarm in which arming is carried out using a dynamic dialogue between the key fob and the main alarm unit, the alarm unit gives the key fob a random number and they only convert this random number using a known algorithm and compare the answer, this procedure can be repeated repeatedly. How, simply put, does it actually work?

This article was written by us in 2011.
Would you like to choose an up-to-date dialogue alarm system or a security complex?

Let's try to explain, starting with the explanation "on the fingers"! The keyfob issues a request to execute a command (for example, disarm), the alarm unit generates a random number in response, depending on the encryption bit depth, it may differ in the number of digits, then transmits this number to the keyfob. We will not bring to fanaticism the bitness of the numbers used, we will take three-digit number. For example, 536 (let's call this number X). And we will create some simple algorithm by which we will convert this number, for example:

(A + X*B + X 2 *C + X 3 *D)*E = Y

A, B, C, D, E are arbitrary numbers that are unique for each signaling, moreover, the encryption method itself (that is, the type of the equation itself) may differ for the same signaling models, let's call these numbers unknown and try to mathematically clarify how can you figure out these numbers? That is, how can you crack the code and find out the next number? Let's start with the answer - what number will be the correct keychain answer? Here Y will be the correct answer. What do we have in practice? Instead of our unknowns, let's take ordinary arbitrary numbers, positive and negative. For example,

A = 2; B=-17; C=85; D=59; E=-44

Plugging in our unknowns, we get:

(2 + 536*(-17) + 536^2*85 + 536^3* 59) * (-44) = -400833829176

That is, our correct answer, Y = -400833829176

Having intercepted once the request and the response of the dialog signaling once, in no way will we be able to find out what those very unknown numbers are. Having an even simpler case - a system of linear algebraic equations (slough), it will be necessary to intercept as many times as there are unknown variables in the equation, that is, in our case it is 5 times. Add to this the fact that after one correct answer, the dialog signaling can perform the same procedure several more times, but with a different form of transformation. The current most popular replacement code grabbers just work on the principle of the sufficiency of one interception - the code grabber captures one signal, gives noise to the signaling unit, and then uses the received code to open the car.

Naturally, we slightly simplified the situation with coding, starting to explain on the fingers how it works, how the dialog signaling works. In fact, the situation is much more complicated - there are so-called hash functions. A hash function is an algorithm that receives a certain value from a string of arbitrary length, depending on the bit depth of the encryption and the algorithm itself, the answer can contain up to 32 numbers and letters. This is how passwords are stored on forums. When, during authorization, you are sent a letter with a request not to lose it, since the password cannot be recovered, this means that the site or forum management system itself does not know your password. It does not compare the password, but only the result of the hash function of the password you entered and the same result stored on the server. How does such a system work?

We take our random number 536 and try to find out what connection the answer will have with some neighboring numbers! The most popular hashing algorithm is MD5:

MD5(536)=

MD5(535)=

MD5(636)=

MD5(546)=

Agree there is little in common in the results, given the similarity in the original numbers. Not necessarily in this way, but in a similar way, the same initial random number issued by the dialog signaling unit will be encrypted. It has been proven that for the reverse decoding procedure, current supercomputers will need about 100 years. Deviating from the topic, you ask - how then are accounts hacked in the mail, forum and in other places? Passwords are often cracked by brute force, it goes without saying that it’s easier to pick up by age, interests, nickname, wife’s name in a day or two is much easier than cracking one of the most complex algorithms. Sometimes it’s even easier to use server vulnerabilities to find out the password, but the whole point is that the password is a known value, but in our case we just need to find the way to reverse the transformation, since each time there will be not a constant password, but a new random number.

What do we get as a result? Even in the simplest case with path encoding slough- you need to intercept intercept exactly as many times as there are unknowns in the algorithm. In practice, in the simplest case, you will need to follow you for months to intercept your code dozens of times, and after that, knowing the shape of the conversion path (and note, even at the factory they may not know it, since it is unique for each model), it will be possible to crack the dialog signaling.

Given all of the above, we can safely say that those who claim that the dialogue alarm is a riffraff, a publicity stunt, or that they will be hacked in the next year or two, are either cunning, or do not even closely understand how the dialogue alarm works. What makes people say so? There may be several reasons:

personal financial interest in selling you a lower quality (crypto-resistant) signaling, because the cost of a fashion expensive two-way signaling goes one to one with the price of dialogue signaling
banal misunderstanding of the essence of the issue, the difference between conventional two-way signaling and interactive two-way signaling
or personal reasons, when a person has already bought some simple alarm, considers it the best and tries to prove to you the correctness of his choice

Of course, the cryptographic resistance of the dialogue code for car alarms is also popular with manufacturers of dialogue alarms (the main ones include Pandora , Magic Systems , Starline, BLACK BUG) are making significant efforts to promote. It got to the point that one of famous companies, specializing in the production of dialogue alarms, even approved a grant of 1,000,000 rubles (or converting 280,000 hryvnias into a commonly understood currency) to someone who can crack the Pandora car alarm code, which again confirms that the dialogue code for code grabbers is an unattainable goal.

Car alarm using a 2.4 GHz conversational control code. The main element of modern digital anti-theft complex, from which the construction begins multilevel system protection.

Miniature key fobs of the DIALOGUE system are made of wear-resistant plastic with a special Soft-Touch coating. Key fobs have an LCD display. Latest Achievements domestic science in the field of digital technologies and modern element base, which are used in car alarm DIALOGUE, provide maximum effective protection car from theft.

Car alarm DIALOG - nothing more, everything you need to protect against theft is in the arsenal of the system. The construction of a modern digital anti-theft complex based on a Hi-Tech class system involves the implementation various devices immobilization and alert functions.

The DIALOG system gives the owner the opportunity to flexibly approach the construction of an anti-theft complex. The user of the car alarm DIALOGUE can independently choose the method and device of notification that is most suitable for him and corresponds to required level protection. For example, it could be traditional automotive systems security pager operating at a frequency of 433.92 MHz and providing the transmission of alarm messages over several hundred meters. More effective notification can be organized using GSM devices, such as:
MS-PGSM Light - notification distance is not limited, due to the presence of a GSM network;
MS-PGSM3 is a GSM autopager with a built-in GPS module, which makes it possible to determine the exact location of the car and its route.

Peculiarities MS Dialog

Dialog system control code with individual encryption keys in each key fob, which eliminates the possibility of intellectual hacking of the system;
Digital bus LAN - secure data transmission network of the anti-theft complex DIALOGUE;
Integrated into the system, a digital three-axis sensor of displacement and inclination, which controls the position of the car in the "Protection" mode;
Integrated into the system digital sensor impact with high impact selectivity obtained through the use of MEMS technology;
Digital power relay blocking RL-100 in a miniature version (included in the kit);
Hood lock control with RL-200 digital LAN controller;
Silent control of the light signaling, which makes it much more difficult to determine the location of the system in the passenger compartment;
Key fob range - 5-20m (declared by the manufacturer)
Protected zones - contact (hood / trunk, doors), built-in shock / tilt sensor ( mechanical impact), MKV sensor (supplied separately), ignition lock input

Discussing interactive car alarms. In the material: principles of operation car alarms, working on the basis of the dialogue code.

Security systems for cars with dialogue codes

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The process of technical development is not on dead center, but tirelessly continues to cover new areas from year to year human activity. There is nothing surprising in the fact that security systems for cars (immobilizers, car alarms) are constantly being improved by the manufacturers themselves. The same situation is with static type signaling devices, which gained a certain percentage of popularity during the period when they had just begun to develop security means for cars. Usually the code can be read quite in a simple way, if the criminal uses a code grabber, however, in the case of a device that has a dialogue code, such a trick will not work.

It is clear that static security systems for cars are currently not are issued. For this reason, we will not discuss this type of alarm, but rather we will immediately move on to car alarms that work on the basis of a dialogue code.

The dialogue type code in the car alarm is a kind of call sign vehicle, which is intended for the owner of the car. In order for the removal of a special code to be implemented (security systems), you will need to send a signal from the radio transmitter (you just have to click on the button). A signal of this kind is subject to further processing by the system, and then it will send a digital combination in a completely random way. After all this, the alarm key fob will acquire a code that has an encrypted form and send a response signal. With a complete match, the car security will be in a deactivated state. It is worth mentioning that the dialogue is implemented only when the system has a set of data about the user that was previously driven into memory. This is how the dialogue process of the owner and his vehicle is carried out.

How reliable are interactive anti-theft systems?

The connection of the dialogue (two-way) type of car and the car owner has a number of special advantages. The main advantage of these devices is privacy. Only the owner of the car has the ability to receive the signal. In addition to this fact, the combination of numbers is built in a completely random order, without any regularity, and also cannot be repeated. Therefore, guessing or calculating the encoding will not work.

Another advantage of protection devices with a dialogue system is the possibility of installing this type of signaling devices on different cars. The protection device is not tied to a specific vehicle model, to a specific type of engine.

There is only one important drawback: the user will have to make a choice of a car alarm system that has support CAN bus or with the absence of it, so this nuance depends solely on what kind of car you have.

On what dialogue principles does the protection of the radio channel work?

Two-way communication has provided several great opportunities to use new coding algorithms, which are based on a dialogue request-response system. The principles of the conversational system have managed to gain popularity at a fairly rapid pace due to the wide range of positive features that are hidden in radio reception sessions. In addition to the fact that the code is very persistent, there is also an additional advantage - the exchange of useful data during the authorization period. The next advantage of the codes of the dialog type can be quite justifiably considered that there is no need for a synchronization process for the counters. A similar procedure was carried out in without fail on a system with one-way dynamic code.

Synchronization of counters was mainly used by attackers to implement encoding substitution. Most car manufacturers have been using dialogue-type codes for a long time when creating their "four-wheeled creations". The first transition to signaling of this type was carried out back in two thousand and six. However, the requirements imposed by the service do not make it possible to speak about the absolute correctness of decisions of this kind, because any regular system must have service channel so that even the most perfect code can be bypassed.

The main feature of car alarms that have a two-way connection is the function of transmitting certain data that is associated with security system vehicle, to the radio transmitter. The distance over which the transmission process is carried out can be about one thousand four hundred meters. Signaling devices of a similar plan have remote controls remote control equipped with an LCD display. The radio transmitter controls the signaling device, as well as the security level of the car. Remote controls provide the user with all the information that is presented as pictograms-symbols. Dialogue-type car alarms come in various types.

Installation process dialogue systems guards with remote sensing ( remote start) engine, takes into account great amount various nuances. Even with very low temperatures car showroom will be filled warm air, the engine will be warm. The activation of the machine engine is usually done either using a key fob, being at a close distance from your car, or automatically. The user can set a timer that counts down. When the time runs out, the engine will automatically stop. The user is free to set the timer, which after a certain period of time will give a signal to automatically stop.

The implementation of the installation process of alarms for vehicles based on dialogue communication is suitable for any vehicle. They have very low level adaptability to carburetor engines, because during ignition you can approach increased speed, and pull out the choke handle.

Varieties of car alarms with a dialogue code

The signaling device Alligator S 200 has two-way communication, it has LED
key fobs, however function auto start missing here. car device to ensure the safety of the vehicle offers up to 6 protection zones, 2 chains for interlocking car engine, also a personal code and a mode that prevents car theft. The personal code is not required for use. This alarm has a silent protection mode. The system does not provide for the use of the mode anti-theft device immobilizer. There is a function of separate deactivation of the sensor areas, as well as a quick deactivation of the passive setting, memorization of 2 causes of operation. The remote control has a vibration mode.

The MongusDuplex security complex works with interactive communication, without the automatic start function. The distance at which the radio transmitter operates can be up to four hundred meters. The MongusDuplex car alarm device operates when using 5 protective zones. Also included is a personal code. The Mongus car alarm has a mode for providing an anti-theft situation according to the principle of the immobilizer. When the Mongus car alarm is being installed, it is possible to activate the “freehands” function using the auxiliary unit.

with installation 11500 rub.

Peculiarities

DIALOGUE is the world's first car alarm using a 2.4 GHz conversational control code. This is an innovative product from Magic Systems that sets new standards auto security systems.

Miniature key fobs of the DIALOGUE system are made of wear-resistant plastic with a special Soft-Touch coating. Key fobs have an LCD display, which used to be typical only for alarms with a pager alert channel. We believe that every modern digital car alarm should have this attribute. Control modern system protection, should be simple and intuitive for the user. This is exactly the task that our developers set themselves when they created the DIALOG car alarm key fob.

High contrast LCD display and bright Neon lights system keyfobs provide a user-friendly interface for system management, making the dialogue between the user and the device more informative and visual. Thanks to the LCD display of the key fob, the user of the DIALOGUE system has the opportunity to:

see confirmation of the command execution;
at any time see the last command that was given by the key fob;
see what alarm events were in the "Protection" mode;
determine from the information on the display faulty zone protection;
quickly adjust the sensitivity of the shock sensor;
assign key fob buttons to perform quick commands (for example, “open the trunk”);
visually, looking at large, well-read segments of the display, select the arming method;
find out about the need to replace the key fob battery - this function is provided by a separate symbol on the key fob LCD display.
The latest achievements of domestic science in the field of digital technologies and the modern element base, which are used in the DIALOGUE car alarm, provide the most effective protection of the car from theft.

The DIALOG system is the main element of a modern digital anti-theft complex, from which the construction of a multi-level protection system begins.

Maximum protection The following components guarantee against theft using the DIALOGUE system:

Dialog system control code with individual encryption keys in each key fob, this eliminates the possibility of electronic-intelligent hacking of the system;
digital interactive LAN network- secure data transmission network of the anti-theft complex DIALOGUE;
A digital three-axis sensor of movement and inclination integrated into the system, which controls the position of the car in the "Protection" mode;
Digital shock sensor integrated into the system with high impact selectivity obtained through the use of MEMS technology;
Digital power relay for blocking the engine RL-100 in a miniature version (included in the kit);
Hood lock control with LAN RL-200 digital relay;
Silent light signaling control (built-in FETs), which makes it much more difficult to determine the location of the system in the passenger compartment.

Car alarm DIALOG - nothing more, everything you need to protect against theft is in the arsenal of the system. The construction of a modern digital anti-theft complex based on a Hi-Tech class system involves the performance of immobilization and warning functions by various devices.

The DIALOG system gives the owner the opportunity to flexibly approach the construction of an anti-theft complex. The user of the DIALOGUE car alarm can independently choose the method and device of notification that is most suitable for him and corresponds to the required level of protection. For example, it can be a traditional pager for car security systems, operating at a frequency of 433.92 MHz and providing the transmission of alarm messages over several hundred meters. More effective notification can be organized using GSM devices, such as:

-MS-PGSM Light - notification distance is not limited, due to the presence of a GSM network;
-MS-PGSM3 - GSM-autopager with built-in GPS module, which makes it possible to determine the exact location of the car and its route.
Connection to the DIALOGUE system of any of the above GSM autopagers via LAN buses, opens before the user of such an anti-theft complex, extensive opportunities for the free Internet service Car-Online.

Control at a frequency of 2.4 GHz. This is an innovative product from Magic Systems, which sets new standards for auto security systems.

Miniature key fobs of the DIALOGUE system are made of wear-resistant plastic with a special Soft-Touch coating. Key fobs have an LCD display, which used to be typical only for alarms with a pager alert channel. We believe that every modern digital car alarm should have this attribute. Management of a modern security system should be simple and intuitive for the user. This is exactly the task that our developers set themselves when they created the DIALOG car alarm key fob.

Contrasting LCD display and bright LED backlighting of the system keyfob provide a user-friendly interface for system management, making the dialogue between the user and the device more informative and visual. Thanks to the LCD display of the key fob, the user of the DIALOGUE system has the opportunity to:

see confirmation of the command execution;
at any time see the last command that was given by the key fob;
see what alarm events were in the "Protection" mode;
according to the information on the display, determine the faulty protection zone;
quickly adjust the sensitivity of the shock sensor;
assign key fob buttons to perform quick commands (for example, “open the trunk”);
visually, looking at large, well-read segments of the display, select the arming method;
find out about the need to replace the key fob battery - this function is provided by a separate symbol on the key fob LCD display.

The latest achievements of domestic science in the field of digital technologies and the modern element base, which are used in the DIALOGUE car alarm, provide the most effective protection of the car from theft.

The DIALOG system is the main element of a modern digital anti-theft complex, from which the construction of a multi-level protection system begins.

The following components guarantee maximum theft protection with the help of the DIALOG system:

Dialog system control code with individual encryption keys in each key fob, this eliminates the possibility of electronic-intelligent hacking of the system;
Digital dialogue network LAN - secure data transmission network of the anti-theft complex DIALOGUE;
A digital three-axis sensor of movement and inclination integrated into the system, which controls the position of the car in the "Protection" mode;
Digital shock sensor integrated into the system with high impact selectivity obtained through the use of MEMS technology;
Digital power relay for blocking the engine RL-100 in a miniature version (included in the kit);
Hood lock control with digital relay LAN RL-200 ;
Silent control of light signaling (built-in field-effect transistors), making it much more difficult to determine the location of the system in the passenger compartment.

Car alarm DIALOG - nothing more, everything you need to protect against theft is in the arsenal of the system. The construction of a modern digital anti-theft complex based on a Hi-Tech class system involves the performance of immobilization and warning functions by various devices.

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