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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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Will an iOS app (IPA) that requires a login work if I repack it and install it on the device?

I downloaded iOS WhatsApp from App Store, decrypted the binary, repacked it, and installed it back onto the device (deleting the app before installing). When I opened it, it only showed me a blank ...
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42 views

Disassembly and decryption of internal files of Unity game [closed]

I'm seeking for help and future direction for my work. I'm looking for game data of Ragnarok M: Eternal Love and stuck at point of decryption of LUA files. The game use SLua unity library (c++ ...
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51 views

Decode Rolling Code

I have a motorized curtain, which uses a 433Mhz RF Control. I'm trying to figure out how is it encoded. I could already get the times and converted to HEX representation. Below has 10 samples for ...
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0answers
68 views

Bike battery and coded frame [closed]

I'm writing you from France sory if my english is not perfect. I'm trying to repair my bike battery (PANASONIC NKY350B2 8Ah 36V) and there is a coded frame send with UART at the start of the bike. ...
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1answer
55 views

How to identify which iOS kernelcache is installed?

I've an iPhone7 running iOS11.3 (15E216). The ipsw for this build version contains two separate kernelcache files named kernelcache.release.iphone9 and kernelcache.release.iphone10. Neither file is an ...
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2answers
91 views

RSA Decryption? [closed]

I am playing a game in my university where you have different puzzles based on cryptography and now in a puzzle named 'rsa', we have 2 files: 'key', 'secret'. The task for this is to decrypt the ...
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0answers
92 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
83 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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101 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
74 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
125 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
108 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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1answer
186 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
72 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
1k 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
104 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
337 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
95 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
1k 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
71 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
210 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
145 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
707 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
259 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
237 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
556 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
88 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
339 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
88 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
254 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
314 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
25k 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
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1answer
386 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
465 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
729 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
128 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
221 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
127 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
72 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?
2
votes
1answer
510 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
87 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
234 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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votes
1answer
471 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
2k 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
6k 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
353 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
1k 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
90 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 ...