Questions tagged [encryption]

Process of encoding information such that decoding requires the knowledge of some secret (a key). This tag covers questions about obfuscated and encrypted programs, or tools, but higher level questions may get better answers on Cryptography Stack Exchange.

33 questions with no upvoted or accepted answers
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1answer
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Howto clone Android RSA SecurID Software Token

At the moment I try to figure out how the RSA SecurID Software Token protects itself from getting cloned to another android device. The token I imported has no device binding enabled and I already ...
5
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0answers
589 views

Reverse engineering an hydrometer's Bluetooth communication

This is a very specific question. I'm currently working on a project to create an android application capable of reading the values of an hydrometer via Bluetooth. By reading the datasheet, I suspect ...
4
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0answers
3k views

Well-known JSON obfuscator that puts the string “Salted12” in front of obfuscated files?

I have an application that pulls some JSON definition files from the internet. In former versions of the application, these files were genuine json files; now, in a later version, they seem to be ...
4
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0answers
780 views

Reverse Engineering XORed string

I am trying to reverse engineer some data received over serial port. The hardware sending the data consists of a gps, compass and a power monitoring unit (which sends information about the battery). ...
3
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0answers
710 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 ...
3
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1answer
572 views

Reversal of unknown obfuscation or encryption with known plaintext

Introduction For academical reasons I am reversing a firmware for an embedded device. I have already created a perl script which is able to parse the firmware structure and extract files from it (its ...
2
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1answer
147 views

PE32+ executable : .text segment encryption

I am working on PE segment encryption(in C++). I completed the PE32 .text segment encryption. I added stub segment to the PE that will decrypt .text segment at runtime. Used inline assembly in the ...
2
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0answers
118 views

How should I got about working out the format for this psp game?

I have been attempting to reverse engineer a format for a visual novel psp game ('Mirai Nikki RE: WRITE - 13 Ninme No Nikki Shoyuusha') and I have come to the understanding that the format works as a ...
2
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0answers
1k views

Arm hex firmware reverse

it has been a couple of months that I'm working on the firmware produced by a company that makes (not licensed) gamepad console adapters. One of my goal was to understand how they bypassed (hacked) ...
2
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0answers
291 views

What encryption/compression is this, and how to encode/decode from it?

I've been trying to reverse engineer an Android app's communication protocol using a combination of Xposed and Packet sniffing. Most of the packets the app sends have this header set: Content-Type: ...
2
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0answers
2k views

Unpacking and disassembling mach-o binary

I am trying to reverse an OSX mach-o binary, Disassembling gives me a bullshit, seems its encrypted with some packer. I need to determine the encryption algorithm, and decrypt the binary. Load ...
1
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0answers
41 views

Possibly infected image

Long story short I'v downloaded a template for my website and instead of images it has the .html files included, and at the beginning those html files do include PNG IHDR , and they are being loaded ...
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0answers
324 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
384 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
730 views

How to decrypt .jpg files of comics app in a C Program?

I'm trying to decrypt jpg images of comics I purchased in my comic reader app on android but neither I can view them (after copying from SD card to Windows desktop) nor can I convert them to pdf to ...
1
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0answers
176 views

Decrypting/Decoding encrypted/encoded data

I'm trying to increase the interoperability of some database software. The database can write and read "stored SQL queries". I wanted to figure out the format of these SQL queries so I can build them ...
1
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0answers
354 views

Help on 7zip PW cracker / Reverse engineering question

So a couple weekends ago I attended a cyber Security workshop where I met a prospective employer who gave me a business card. On one side it read "There are two individual challenges that lead to a ...
1
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0answers
475 views

File reverse engineering - .tbl format

I've been trying to google any information about how can i create a viewer for some custom file formats. In my case I've extracted multiple .tbl files from game sources. This file contains a database ...
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0answers
242 views

How to remove SimplePack signature so it won't be detected by AVs

I've tried SimplePack, which is an open-source file packer for windows, now, for some reasons, when I check via online virus-checkers, lots of alerts are being popped saying the file is crypted using ...
1
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0answers
581 views

How to decrypt this file?

I have to decrypt a file that is used by an app built using VB5. The file itself contains some data that is decrypted when the app is run and the decrypted data is text data that is displayed in a ...
0
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35 views

RE Huawei HG8145V5 user credentials

I have Huawei HG8145V5 and I backed up config file which contains encrypted root and admin credentials, but I dont know how they are encrypted. Here is an example of one password $2*FuHXY<y5$...
0
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0answers
65 views

reversing xiaomi update firmware encrypted?

I am playing around with a xiaomi firmware [mijia_4k_0.6.16.02] for a camera Running binwalk on the file I see this output DECIMAL HEXADECIMAL DESCRIPTION ----------------------------------...
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28 views

How to bypass encrypted disk Android pin lock?

I have a forgotten pass code of my android device which is encrypted and ask password before boot time. How can I recover the pass or my data...
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0answers
88 views

How to recover randomly generated private key from a Program that implements Diffie Hellman Exchange

This program implements Diffie Hellman key Exchange, a pair of random private keys are generated every time the program runs. How should I go about finding the random number generation subroutine ...
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56 views

Packet: Game last byte encrypted?

12:14 WSARecv() C3-73-3E-BE-36-2F-14-37-37 F4-44-09-89-01-18-23-00-00 ------------------------------------------ 12:14 send() C3-73-38-31-0E-35-EE-35-A5-35-7F-34-37-37-8D F4-44-0F-06-39-02-D9-02-92-02-...
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157 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
64 views

How does windows 10 v.1803 save the password in the SAM file?

I'm doing a search on how windows 10 saves hashed passwords in the SAM file. From this article I suppose that Windows does this: If the password is 123456 and the user has RID 000003E9: CALCULATION ...
0
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0answers
94 views

Reverse Engineering a Vehicle Identification Number (VIN) encoding

Not sure if this is the right place so please point me to the right place if needed. I have an input of a VIN (Vehicle Identification Number) number with 17 characters, each character is either an ...
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113 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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64 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 ...
0
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106 views

Locate compressed section of executable

I am playing with Philips DICOM Viewer - download version R3.0 SP3. This viewer can display DICOM information (press F9). Since the displayed strings are not stored in the DICOM file itself, I suspect ...
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858 views

How does iOS hash and salt passwords on its secondary-storage?

I bought a used iPhone from someone, but I accidentally got a lock screen on the phone and can't figure out what the passcode is. Long story short, how does iOS hash the passcodes for entry, what kind ...
-2
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1answer
345 views

EXE Encryption Techniques

Are there any tutorials available for learning how to do encryption of an EXE ? I am particular interested on how it decrypt's itself and runs in memory. If there are any tutorials or post that ...