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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0answers
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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0answers
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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0answers
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 -
...
3
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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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0answers
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 ...
3
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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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0answers
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']());
...
1
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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 ...
1
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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 ...
1
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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....
2
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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 ...
3
votes
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
...
1
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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.
...
2
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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 ...
0
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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/...
4
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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 ...
4
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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 ...
2
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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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0answers
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 ...
2
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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 ...
1
vote
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 ...
-1
votes
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 ...
1
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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 ...
1
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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 ...
9
votes
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?
