Questions tagged [decryption]
Process of decoding an encrypted message with an authorized access (knowledge of the protocol, the encryption algorithm and the key).
146
questions
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17 views
How to find .lu encryption method in Android app using Frida?
I was able to extract resource.car from a Corona android application.
And then unpacked it using corona-archiver.
But I can't read file contents, I've tried luadec and failed with error:
bad ...
0
votes
0answers
41 views
Frida finding out a decryption/decode algorithm
It's been a few days I'm working on an application to find out about an encryption it is using on a few strings received from API, but no success so far.
These are the strings:
...
0
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0answers
59 views
Key Algorithm Reverse
I am trying to reverse a Seed/Key algorithm. i have some sample and knowledge about it, for example i know this algorithm work with only "xor" and "shift" operations.
some sample shown in below:
...
1
vote
1answer
99 views
Reversing an encoded key with a given cipher - figuring out the reverse algorithm
So I have an ancient application for a company that has since gone bust and I thought I'd look at how it works; it provides a key, and requires a key given to it. Both these keys are encoded in a ...
4
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1answer
155 views
Stuck on XOR decryption of firmware
TL;DR
I have an encrypted image and the cleartext version, and I'm almost certain it's an XOR cipher, but I can't figure out how to decrypt it. I have a few clues listed below.
Ciphertext excerpt (...
0
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1answer
100 views
Help with reversing decryption in assembly
I've used x64dbg to work out decryption in a particular program. I've found where it changes the encrypted material into readable text but can't work out the best way to use this information to ...
0
votes
1answer
111 views
How to decrypt a file who encryption and key is unknown? [closed]
Here is the file that I am trying to findout a way to decrypt.
settings.ini
This file is from the settings of the MetaTrader 5. The same is the name of the application.
Kindly suggest a better way so ...
0
votes
0answers
98 views
Reverse ASCII checksum algorithm
I am looking to reverse engineer what appears to be a 24-bit ASCII checksum. I tried the standard CRC 16 and 32-bit checksums and they don't work. Any pointers would be appreciated. Here is some ...
0
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1answer
214 views
How to decrypt the password using radare2 or gdb?
.--------------------------------------------------.
| [0x804851b] |
...
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0answers
80 views
What kind of compression/encryption could this be?
I am dealing with a file that seems to use some kind of proprietary compression/encryption I can't figure out. I have a lot of sample files as well as different versions of the same file, so I have ...
2
votes
1answer
168 views
Recognize a decryption algorithm
I'm trying to reverse a malware that builds its IAT at runtime. Due to my inexperience, I'm having trouble to understand this function that accepts into EAX a dword (maybe some sort of hash) and into ...
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0answers
188 views
Decrypting the Config file of a Huawei router “HG630 V2”
followed that post from Wordpress
https://hg658c.wordpress.com/2017/12/04/decrypting-configuration-files-from-other-huawei-home-gateway-routers/
Extracted the 4 Hex strings needed. But, looks ...
2
votes
1answer
41 views
Partially correctly decoded strings from pkware zip with known plaintext
I have a password-protected zip file, where the paths and filenames of each file are encrypted using PKWARE encryption.
The password is known and correct, and so is the encryption algorithm.
I also ...
5
votes
1answer
171 views
How does IPA decryption works?
All IPAs being downloaded from AppStore gets encrypted on servers as part of FairPlay DRM. But decryption is accomplished on local device. As far as I know there is some hardware module which contains ...
0
votes
1answer
689 views
decrypt config.bin file from Huawei B5328 router i have source files
Hello i need somehelp in decrypting the file config.bin generated by the page backup_setting.html from huawei B5328 router , i have access to all files in the router even the www files hosted on the ...
0
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0answers
365 views
Decrypting Lua Files from game
I'm truing to decrypt LUA scrpits from cocos2dx game (for wiki).
Links to files of game:
libhellolua.so (cocos2dx external library)
example encrypted LUA-scripts (*.abc files)
I was reading a ...
0
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0answers
195 views
how can i Encrypt a decrypted zte zxhn h108n V2.5 config file?
i have decrypted the config file using a program i found online ( maybe made by python to exe )
so to decrypt using it you type is command into CMD
decode_zte_config.exe config.bin config.bin.xml ...
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0answers
130 views
find a video file in memory dump of a process
I have a player that plays encrypted video files and works like this:
I open an encrypted video file with it
it decrypts the video file and writes it to its memory
and plays the file from the memory ...
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1answer
261 views
Determining the hash algorithm used [closed]
I have some test data:
Test 1
Text: pass1234
Salt: 33b9d87b83c097ce3ea6e6f84a298f839aafc6d7aa23d909a43ac94bdee35ddf
Hash: 61477724c136fb285918114792685a4d
Test 2
Text: test1234
Salt: ...
1
vote
1answer
77 views
Reverse Engineering Temperatures (RS485 Bus)
I have the following hex byte data. Can someone help me reverse engineer the temperatures calculation?
ID
||
81 00 8c 00
82 00 aa 00
83 00 04 01
84 00 ff 00
85 00 21 04
The first byte is the id!...
-1
votes
1answer
219 views
Intercept zip decryption key or files from an application
If an application is reading from a password protected zip file, is there a way to intercept the key being sent to decrypt the zip file. Or, is there a way to dump the files being read themselves?
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65 views
How to guess the key of XOR encryption in java?
I am trying to find the key of XOR encrypted string in java. It is very much probable that the key is eight characters long. I have the encrypted string.
I am not able to understand how to go ...
1
vote
1answer
172 views
picoCTF be-quick-or-be-dead-1 dcrypt simulation with python
This is be-quick-or-be-dead-1 in picoCTF challenge (Download)
in this file we can see decrypt_flag() function, this function return this flag:
./be-quick-or-be-dead-1
Calculating key...
Done ...
1
vote
1answer
144 views
Sniffing TCP packets using Wireshark
I am trying to reverse engineer a decoder. The decoder contains a web server that makes sending/receiving information through the Internet possible.
To do so I need to sniff the packets that the ...
0
votes
1answer
865 views
Ghidra pseudocode to Java/C
I have this piece of code generated from Ghidra
void __cdecl FUNCTION(uint *key,uint *text)
{
undefined uVar1;
ushort uVar2;
uint *puVar3;
uint *puVar4;
uint *puVar5;
int iVar6;
uint ...
0
votes
1answer
162 views
Difficulty decrypting LCG string
I'm trying to analyze some malware. To get the hang of it I am following the decoding process on this website:
Here is a description of the string encoding/decoding process:
String encoding ...
0
votes
1answer
109 views
Is it possible to recover the key to a decrypted file?
Is it possible to recover the key to a decrypted file if you have the initialization vector and it uses RijndaelManaged? If so how?
The file I want to recover the key from is a xml that looks like ...
-2
votes
1answer
73 views
Can any one de-obfuscator this php code [closed]
my developer has changed all his contact info and i am unable to contact him
and i want to move my site to another server but because of this obfuscator code in my php script i am unable to move my ...
1
vote
0answers
102 views
Decrypt ibt.sfi linux firmware(Intel Wireless 8265 Linux Bluetooth)
Why I want to decrypt:
Intel 8265 Bluetooth is likely a RAMUSB device, which needs system to update firmware. I try to transplant this linux firmware to macOS.
Problems I met:
The macOS BT firmware ...
3
votes
1answer
285 views
Reverse engineering file format - ImageLink
I have some technical documentation which is supplied in the form of a generic Windows viewer and a database. The database contains different "books", which are represented by a bunch files:
book.bbi ...
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0answers
57 views
1990s non windows software keys [closed]
Hi I am a Service Engineer on some very old ASML stppers that run a system called PAS (Philips automated steppers), these steppers are obsoleted by the manufacturer and no longer supported by anyone. ...
1
vote
1answer
272 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 ...
0
votes
2answers
473 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 ...
1
vote
0answers
346 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
182 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 + ...
3
votes
0answers
325 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 ...
0
votes
1answer
140 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
votes
1answer
184 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 ...
3
votes
0answers
161 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 ...
-2
votes
1answer
514 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 ...
1
vote
0answers
83 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 ...
-3
votes
1answer
7k 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
vote
1answer
253 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 ...
-1
votes
4answers
597 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 ...
0
votes
1answer
141 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....
2
votes
1answer
3k 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 ...
1
vote
2answers
110 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 ...
1
vote
4answers
343 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
vote
1answer
247 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
vote
1answer
1k 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 ...
