Questions tagged [protocol]

A system of rules designed to allow the communication between two or more participants. The two main types of protocols are either stateless protocols (UDP) or stateful protocols (TCP).

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Identifying the source of encryption used by UDP packets in a PCAP file

I have a PCAP file (mediafire link to the file) which basically represents packet captures between 2 machines running the same game connected to each other via LAN inside RPCS3 using RPCN. One of ...
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Help MMO Tcp Packet

I'm trying re-send the packets that an MMO sends to the server just to learn more about packets. The game uses TCP. I sent the same message in the game chat "oi" to analyze the packages sent ...
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Password encryption when transferring from master to PLC

So, there is a PLC and a SoftMaster program to work with it. The PLC works according to the XGFenet protocol. When connecting to the PLC for the first time in SoftMaster, a password must be entered. ...
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2 answers
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What is the best approach to reverse a custom TCP Application Layer?

I have recorded a TCP Stream using Wireshark, so I have Client/Server Communication as a hex dump. What is the best approach to reverse the custom application layer? Some data seems to be ascii ...
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Reversing DALY BMS BLE protocol

I am trying to communicate with the DALY BMS (Battery management system) via BLE. I was wondering if anyone has any bit of information regarding their protocol, something to start with?
6 votes
1 answer
883 views

HackRF One - Replay Attack on Garage Door does not work (12 DIP switches)

TL;DR solution Setting 4MHz sample rate and 2Mhz bandwidth in the capture tab (according to the Nyquist theorem the sample rate has to be double the bandwidth) Using the length of a DIP switch ...
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2 votes
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How to determine a type of binary serialization?

I'm trying to analyze the messages that the game sends to the server through WebSockets. I have a simple WebSockets proxy that stands in the middle and prints all messages to the console. I noticed ...
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3 votes
2 answers
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On reverse engineering an udp protocol to control a drone

My goal is to control my drone with my raspberry pi using python and not the app that is being delivered together with it. First I connected the app to the drone, flew and used aircrack-ng to get the ...
3 votes
1 answer
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Is it possible to sniff an ATA Drive password?

Context: I have a proprietary Tandberg Data RDX QuickStor Internal USB3 drive bay for PC (item number 8666-RDX) and some storage cartridges for it. Esentially, these are just regular TOSHIBA MK3276GSX ...
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714 views

Modern tools for reversing binary network protocols

What are some modern tools or techniques for attempting to reverse a binary protocol sent over UDP? I've been trying to do research on this, and it seems like almost everything is obselete. Previous ...
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What checksum algorithm is this?

I'm trying to control an air conditioning unit. The app and the unit communicate using the Broadlink protocol. I can decode the settings it's sending and replay them. The payload is 32 bytes but only ...
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365 views

Reverse UART communication protocol

I'm objective is to build a custom wifi module to be used on a Samsung AC AR24HSFSAWKN. I have such an official module SWL-B70F for which I'm trying to reverse engineer the communication with the main ...
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Touch screen driver module - Determine comunication protocol

I have taken apart an old non-functional Lenovo IdeaCentre (B320) computer. I would like to get the glass touch panel to 'work' (I would consider anything from simply being able to sniff the x,y ...
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Manufacturer interface on OCZ Agility 4 SSD

Inside the housing of an OCZ Agility 4 SSD I found several additional connectors on the opposite site of the SATA connectors. What are they good for and how to connect them properly? Zoomed:
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What's wrong with my mitm to support rr commands with gdbserver on IDA?

First of here is the gdb remote protocol doc. The idea of the below script is the following - you enter an actual command (one that will be send as a direct packet see packets) in the gdb window then ...
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Determine checksum / CRC algorithm

I am doing reverse engineering on some network protocol. It is client to server communication and I am pretty stuck with identifying checksum (or CRC) algorithm used in packet structure. I tried ...
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Checksum field within IR protocol

I am trying to reverse engineer the IR protocol for my air conditioner (GREE - remote control YAP1FF) and with the data I found online and a lot of testing with a IR receiver there is only one field I ...
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Reconstructing struct/union-based IPC protocol wire format

I'm embarking on my first reverse-engineering adventure. I think I've picked a rather dense piece of steak to start out with. I have three C programs which communicate together using an unknown IPC ...
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Reverse engineering non-standard LIN protocol

I'm trying to reverse engineer an ECU / GSU protocol from a model airplane jet turbine, in order to make a telemetry adapter. I have decoded several other protocols in the past with good success but ...
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Likely protocol determination by chip IDs and connections?

CONTEXT: My first post in this stack. Absolute beginner at RE. Also generally a beginner at anything electronics. Please be kind and correct me instead of ridiculing me. GOAL: Replace a damaged ...
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UE Megaboom serial protocol

I recently got a UE Megaboom Bluetooth speaker. Apart from various audio profiles, I noticed the speaker also exposes a Serial Port BT profile. I suspect this is the channel the app uses to control ...
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How to calculate the checksum algorithm with data captures

I have an obsolete control system that I am trying to write an interface into our new control system. I have spent weeks capturing data and figuring out the addressing, polling commands, point ...
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1 answer
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Can't identify checksum type in unknown RS485 protocol

I need to reverse a RS485 protocol in order to extract some values for further usage. Unfortunately only these few messages are available at the moment. They repeat continuosly. Only in special ...
3 votes
1 answer
412 views

Decipher variable length serial protocol

I have an ebike consisting of a controller which regulates power to the motor and a smart LCD which can adjust max speed, power output, pedal assist sensitivity etc as well as displaying the current ...
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What Checksum/CRC algorithm in RF packet?

I am banging my head to figure out the checksum of a RF device, it seems to be a simple one but no luck so far... The first 3 bytes is the SyncWord then 9 bytes is the payload and the last byte ...
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Decoding serial data package

I have an assignment at work, to get information from Jenbacher generator and show values in new SCADA system. It has a B&R CP260 PLC with RS232 port and RS232 to RS485 converter. Currently it’s ...
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2 votes
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serial protocol patterns

I am reversing a serial 232 protocol and I found these pattern in the data. E5 A7 CD 01 00 79 .. .. 40 00 23 00 23 00 23 00 23 00 22 00 22 00 22 00 21 follows some recording and expected approx ...
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4 votes
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Trouble finding the right Checksum algorithm

After reading a lot of posts here and their solutions, Punching lines in CRC calculators for several days now. I can't seem to find on which Checksum this code is based. Background This is a data ...
3 votes
1 answer
378 views

NFC Tag reverse engineering failed by a non-responding tag

I was curious about a system using NFC and I tried to find out what was the protocol. But after digging few days around, I have the card detected by my reader (acr122u) but that's all I get. I can't ...
3 votes
0 answers
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Reverse engineering unknown RS232/UART binary protocol

Background story For couple of days I'm trying to crack the protocol used the old medical device, in order to collect data for a research in an automated way. The device in question is Novametrix ...
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2 votes
1 answer
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Deducing Protobuf Schema and Datatypes

I have a number of protobuf files but no .proto schema file! cat myfile.pbuf | protoc --decode_raw > outputfile.txt Using the above command, I was able to decode the file into a somewhat readable ...
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2 answers
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DPFMate Keychain tool

Got this Digital Keychain Photo viewer thingy. Comes with the DPFMate.exe software, which does not run under Windows 10. So far I've confirmed, that it runs perfectly on what they avertise - Windows ...
1 vote
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FFC on the back of a Chromebook Pixel Display Assembly

Hello! I want to get the touch overlay of a Chromebook Pixel Display Assembly to work. I attached a picture of the Cable coming out of a mxT1664S touch controller. Can someone tell me what type of ...
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1 vote
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Protocol RE, mysterious checksum function

Im trying to reverse engineer a protocol in which some text is sent and has a specific number appended. I figured out that the number is some kind of a checksum (depends on the text somehow) and also ...
2 votes
3 answers
3k views

How to monitor/reverse engineer RS485-connected display device traffic?

Can anyone point me in the right direction for tutorials etc on reverse engineering RS484 connected battery management system? I have a large 12V lithium battery module which has an internal BMS and ...
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What is the format of this time?

I'm trying to interpret a bunch of bytes I'm receiving from a GPS tracker. There are 3 sequential bytes that I believe mean hours, minutes and seconds. I recorded timestamps along with the messages I ...
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reversing ios notes file format [closed]

I am trying to understand how to read iOS notes files as they are saved in the NoteStore.sqlite database in the iOS backup. Here are some sample files. Each file is a different note. I want to get ...
1 vote
1 answer
206 views

Methods for Reverse engineering proprietary protocol

I have a class of devices that I want to connect to. They use a protocol co-developed by a couple companies back in the day and was never published. Electrically there is only one wire which wraps ...
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1 answer
836 views

Daikin A/C 4bit CRC/Checksum

I am reverse engineering IR protocol of Daikin A/C. AC sends the whole current state of remote on each key press. Data sent is 8 byte long, last 4 bits seem to be the some kind of error checking. ...
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1 vote
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Reversing a serial communication with two inputs

I'm making a device that needs me to transfer some sort of initiation code like handshaking to start further communications. There is 2 inputs and 2 outputs the first output is pretty similar to a two'...
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4 votes
1 answer
980 views

Reverse engineer checksum algorithm

I am trying to reverse-engineer the protocol used between my Air-conditioner and the wired control unit on my wall. (In order to have my home automation be able to monitor and control the A/C.) The ...
7 votes
2 answers
1k views

Router's serial port only outputs garbage

I'm trying to reverse engineer a 2Wire ADSL modem/router, mainly for practice. I opened it and found a serial port (with a header conveniently already in place) but I'm not getting any useful data out ...
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XMPP clubs in league of legends

Hopefully I'm asking this at the right place. League of legends recently added the option to join a club. Clubs still use the XMPP protocol just like before for their public chat rooms: XMPP for ...
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Reversing network traffic and rebuild packets

I want to learn something about reverse engineering. I want to rebuild the TeamSpeak connection (client connects to server). I hooked the recv and send + encrypt/decrypt functions and logged the ...
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Trying to replicate a serial protocol

Spent the last few weeks reading, typing, testing, rinse & repeat to no avail in solving a problem. Problem: Trying to reverse engineer a serial protocol at work. Instrument is currently being ...
1 vote
1 answer
398 views

What checksum algorithm is this network protocol using?

I've been working my way through an undocumented TCP-based protocol by monitoring traffic with tcpdump, Wireshark, and some Python packages (scapy, numpy) with good luck so far, but I've hit a wall ...
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4 votes
2 answers
1k views

Reverse engineer 4-bit checksum (?) in Sanyo air conditioning IR packet

I am reverse engineering IR protocol of Sanyo air conditioner. AC sends the whole current state of remote on each key press. Data sent is 67 bits long, last 4 bits seem to be the some kind of error ...
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1 vote
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How can I figure out what serial port communication protocol is a software using?

I'm working to adapt an stress excercise test software so that it can work with a treadmill that uses a different communication protocol. The communicate via a RS232 cable, with a USB-RS232 adapting ...
8 votes
1 answer
1k views

Reverse engineer TPMS sensor data

I'm trying to reverse engineer data received from TPMS (car tire pressure) sensors. I was able to receive and demodulate the data (433 MHz, FSK, Manchester encoding). Probable packet fields: bytes 1-...
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Reverse engineering TPMS sensor data [closed]

I'm trying to reverse engineer data received from TPMS (car tyre pressure) sensors. I used rtl_433 tool to capture the data from sensor at 433 MHz. Tool was able to detect data is using FSK modulation ...
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