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Questions tagged [decryption]

Process of decoding an encrypted message with an authorized access (knowledge of the protocol, the encryption algorithm and the key).

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View Data from a .dat file

I am doing working on a project of my own where I am using the data of a football game to calculate certain statistics on players. Long story short, I am having trouble extracting the data from the ...
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62 views

How to figure out encryption scheme given known packets?

I'm attempting to control a toy RC car with my own custom input device over BLE. The RC car is typically controlled by an app, and I've logged decrypted BLE packets from a session between the app and ...
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72 views

Reverse crypto algorythm, based on AES

Hello! I'm working on reversing one library (shared object) written for ARM architecture. It's obfuscated or packed with something pretty strong what makes debugging much harder and almost impossible ...
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69 views

Reverse engineering key fob checksum

I am trying to reverse engineer the key fob of my Ford Fiesta 2014 but I am stuck at finding the used checksum algorithm. I've successfully demodulates the key fob signal (using on-off keying + ...
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46 views

Server-side unique ID emulation in Java

I'm trying to emulate an XML server-side response for an java application. The application receives a unique ID from the server every time the application open. The response code is similar to this - ...
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0answers
70 views

EEPROM data bytes verification

I'm investigating a tool. I have an section of an eeprom memory dump that this tool uses, shown in the figure below. By my inquiries, the two bytes highlighted in red are based on the bytes ...
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1answer
68 views

how to find private Key and passphrase stored inside a program?

There are some files (drivers) that are encrypted, and these files are working in a program that is installed in my computer. The program using these files needs to decrypt them. I am sure that the ...
3
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1answer
119 views

Help reverse decrypt function (decode -> encode)

I have this java function that decode 8bytes text string(encoded as int[]): public static int[] decode(int[] text, int[] key) { int j = 0x3c; //value 60 in decimal int i = 0x33; //value 51 in ...
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131 views

Decrypt package containing update files for Android system

One of the car manufacturer provides zip packages with updates of their Android based head units. Zip package is served for HU on USB stick as a single file located in root directory - discovered ...
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0answers
97 views

Guessing checksum 8 bit ASCII algorithm

I am trying to reverse engineer an 8-bit checksum algorithm of a Chinese machine with RS485 communication and ASCII encoding. I tried with all the algorithm I could find, but it seems that data ...
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0answers
26 views

Get imei device number from backup data

My phone was stolen and I only have a backup of (Data) files of the apps [Using carbon app]. I was checking the files if I can get the imei from Microsoft Authenticator app, I found the an interesting ...
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1answer
118 views

How do i find the decryption key for a encrypted text file [closed]

So context i have a game and a encrypted save file. My thoughts were how to find the decryption key in reverse engineering my game .I watched tuts but i think this topic isnt much detailed so i need ...
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62 views

File Decryption Problems

over the past year, I provided an English patch to a community of thousands of players of a game I love and which is not available in English (just Chinese and Korean). Sadly, besides me, other ...
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1answer
559 views

How do I decode this JavaScript code? [duplicate]

Each file starts with the same function: (function(_0x128f83, _0x1ae5b9) { var _0x1b5471 = function(_0x339be5) { while (--_0x339be5) { _0x128f83['push'](_0x128f83['shift']()); ...
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1answer
88 views

Reverse Engineering Checksum (RS485 Bus)

I have the following data. Can someone help me reverse engineer the checksum calculation? Data Checksum 01 02 80 05 00 00 00 00 00 7d 8c 01 03 80 05 00 00 00 00 00 ...
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4answers
210 views

Decrypting authorization PHP script

Description I asked for help on freelancing, for the finalization of the project in PHP. All this worked well until I needed to edit the authorization mechanism. Having opened the file, I found that ...
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1answer
80 views

Reverse engineering checksum - LG 485 a/c protocol

I'm trying to reverse engineer serial protocol, everything seems straightforward, except checksum byte. Seems to be some easy algorithm - when sum of all bytes is the same, checksum/crc stays the same....
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1answer
927 views

Decrypting SQLite Database with key

I have a SQLite database that contains a dictionary (just words and definitions) that can be opened with free but proprietary software. To use with the software, it requires an 'unlock' key, which I ...
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2answers
60 views

How is the IV generated from a timestamp based on this function?

Background: I am currently looking to make some diagnostic software interoperable with other software, but all communication that occurs in this software is encrypted with AES-128-CBC. A sample ...
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4answers
190 views

Decrypting SSL traffic from malware

I am a cybersecurity student. What is the best approach to decrypting traffic from a malware? I am using x32dbg (I'm new to assembly) and have trouble finding the private key. Are there any other ...
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1answer
125 views

Reverse engineer CAN-Bus checksum

I am trying to figure out a checksum algorithm. D1 to D6 is data, D7 is a counter obviously and byte 8 must be a CRC, but I didnt have any idea on how to build it. Tried to check if it fits any ...
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1answer
557 views

Need some pointers to decode/decrypt/unobfuscate JSON files (updated with related scripts)

I am very new to this whole business so please bear with me. Goal My goal is to read JSON data from a game. Since I do not know what kind of information will/will not be useful, here are some of ...
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2answers
204 views

IDA: call a function with different arguments

I'm reversing some software and found the function which decrypts some stuff: As you can see it has the password parameter for it which gets decrypted in this function. Function disassembly: ...
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1answer
189 views

Unknown game file decompress [closed]

So I got this file with an unknown extension. The file is an event flow code Ok, so I analysed the file (with HxD) and it seems to be compressed in some way because you can read some plain text there....
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0answers
455 views

How to bypass certificate pinning on OS X and Windows [closed]

When reverse engineering a thick application it can be very useful to be able to see the network traffic it generates. Because of this, many applications use HTTPS to communicate with their servers. ...
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0answers
75 views

Reverse engineer checksum in AC Sharp IR packet

i use microcontroller and received ir frame of air conditioner SHARP. This Ir frame have 13 byte data (in decimal number, not hex) like below: 85 90 243 8 131 140 66 0 176 1 32 7 133 85 90 243 8 142 ...
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2answers
331 views

how to find the encryption algorithm?

I have an arm complied so file and find the decrypt function which pseudocode generated by IDA Pro is like this: char __cdecl EncodeUtil::getDecryptStr() { int *v0; // r0 int *v1; // r7 ...
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0answers
81 views

Difficulty decrypting nested PKCS #7 / AES router configuration file

I am trying to decrypt a router configuration backup file that appears to be a combination of a 128-byte header, a PKCS #7 encrypted file, and another OpenSSL salted format encrypted file. I think ...
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0answers
231 views

Need Help decrypting .luac files

I have been recently trying to decrypt .luac files inside an encrypted android app. I tried to follow some of the previous threads here but the following frida script didn't give any output. ...
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0answers
310 views

Struggling with an archive file format using “encryption”

I am currently working on a file format used to pack (storage only, no compression) different file types together for transport. There is some sort of very simple "encryption" used and so far I have ...
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1answer
21k views

How to decompile an exe file? [duplicate]

I have been wondering, if every program is based on machine code, can we not decompile a program until it hits machine code and make it up to real programming languages? How to decompile exe files ...
3
votes
1answer
361 views

Animal Crossing: Pocket Camp .zdat File

Hello I am trying to obtain the music from the new game Animal Crossing: Pocket Camp. The music is contained in files like these: https://download-cdn-ac-pocketcamp.akamaized.net/assets/...
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0answers
407 views

Obtaining the decryption keys for Super Mario Run (Android/iOS Game)

Super Mario Run is a il2cpp Unity game. Most of its assets are downloaded in-game through http requests. I particularly want the OGG files of the music. I can see the list of their names comes from ...
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2answers
641 views

Identify password generation algorithm

I'm a newbie who just started own way through reverse engineering so I apologize if my question is not appropriate. Currently I'm going through different Crackme puzzles and now I'm stuck. I've spend ...
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1answer
110 views

Checksum in CAN message

I'm trying to fake a CAN message, but I'm not able to understand how the 8-bit checksum is calculated. The checksum follows a pattern along with a 4-bit rolling counter. As long as the data of the ...
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0answers
211 views

How to decrypt files given access to the decryption formula (bash) and passwords (Mach-O binary)

I have a decryption formula, the file it links to containing file passwords, and the encrypted files themselves, but I still don't understand how to reverse the process. Question: Do I need any more ...
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2answers
122 views

decrypting a microSD [closed]

a micro sd has been encrypted by a device, i have a backup of the encryption key (*.pk5), but the encryption device has been destroyed. any suggestions to decrypt the MicroSD? (except of buying a new ...
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68 views

Decoding this value & What encryption is it?

I've got this value, which I think it may contain date, that I want to decode ( decrypt ) and to know what encryption type is it. 3zsWFYXd1Eg= At first, I thought it's a base64 encoded string, But ...
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1answer
2k views

How to decrypt encrypted script files for a game?

I want to mod Tony hawks underground 2. I noticed that the files in a folder scripts (down the game's directory tree), are all encrypted. Where do I start if I want to decrypt them?
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1answer
420 views

Unknown CRC calculation

I am seeking for a CRC calculation on EEPROM content. I try to add options to my car with BOSCH ECU. MCU in this ECU is Tricore TC1793 and EEPROM content seems to be divided into blocks of 128 bytes ...
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1answer
1k views

.dat file how to Encryption and decryption?

I am trying to decrypt or unpack a .dat file I used a variety of methods, but do not work When opened in notepad the text would look like these: luRd+WbiiNGDNgs3XLX1fA== vtAQlLx3N6HybkYYif3pAg== ...
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0answers
85 views

Reverse engineering proprietary database file format .IDF

I have an old (I think) Windows software on a cd-rom, that is basically a database and its interface for show the data it contains. I don't like the software view interface, want to make my own with ...
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2answers
206 views

Reverse engineer encrypted text file if I have both pre and post encryption files [closed]

As per the title, I have an encrypted text file that is generated by an Android app. I then have to send that off to the people whom made the app for them to decode it and send it back. Not ideal as ...
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1answer
415 views

what is best forum to ask about hex reversing? [closed]

i want to create c script extract encrypt package. just can open it in hex editor to view and need knowledge and technique for write script for extract it. Script will work in command-line ( window 10 ...
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0answers
1k views

How to decrypt the config.bin from ZTE ZXV10 H201L

I have this file from my router its backup of user config,I suppose its compresed with zlib and encrypted with AES. Utility which is resposible to compress it and encrypt it is called cspd. In side ...
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2answers
5k views

Extract decrypted Assembly-CSharp.dll from APK via IDA

My friend and I am trying to decrypt the Assembly-CSharp.dll file from an Android game which was written in Unity3D. Normally these files are readable when using something like JustDecompile, but this ...
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1answer
325 views

Encryption (AES-128) in automatic meters reading

I have theoretical questions about encryption when there's a lot of devices involved. Specifically it's about reading meters (water/gas/heat meters). Here's some introduction. I was trying to read a ...
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3answers
934 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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0answers
87 views

How can I make these images appear normal?

I'm trying to extract some images from a PS Vita game. I've managed to get a load of .bin files with names 00000.bin, 00001.bin and so on, but the file types are not the same. Each even numbered file ...
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1answer
3k views

How are Apple App Store Apps encrypted?

I know how to decrypt an iOS app use tools. How is this encryption performed? Why can iOS apps only be decrypted on a device? Is there a device-specific key used for encryption?