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.

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42 views

Trying to understand this game packet encryption/compression

I'm working on dead game (Ghost In The Shell: First Assault Online), trying to get a working server emulator for it. I've done some work on this successfully. However, it seems like they use some kind ...
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43 views

Looking for encoding of SVG data

I have some SVG images stored in a database; but I am not able to find out which encoding is used. Unfortunately, I don't have the exact SVG plain text available. The given examples "probably&...
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Reverse engineering algorithm for get keys

I have 2 groups of 4 byte and from this i have to get a key that have 6 byte. Im trying to get the algorithm but i cant in any way. The 1st group have only one bit different from the 2nd one. Idk if i ...
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Trying to decode the Ontario Driver's License #

**The Ontario Driver's License follows the below format:** LXxxx-FFFMY-YMMDD Where: L is the first letter of your last name X is a numeric encoding of the last name (See Chart 1 below) xxx is a ...
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93 views

Encrypted firmware, need some hints

I'm relatively new to firmware reverse engineering but it has been a very interesting journey, loved it! I am currently trying to crack open the firmware of my Panasonic Lumix DC-G9 camera to see if I ...
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35 views

How to intercept encrypted traffic from windows 10 vm application?

I have a virtualbox virtual machine which is running windows 10 and is running a piece of software (LINE desktop client) which i would like to analyze. Specifically i would like to analyze the traffic ...
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96 views

Android packageInfo signature

Are there anyways I can learn what packageInfo.signatures[0] is so I can use it to apply the same algorithm in Python. To further explain: private static SecretKeySpec a(Context context) { ...
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33 views

help about methodology

I am a beginner in reverse engineering. For a challenge I need to reverse a code in python this code use enigma algorithm : To found the good configuration to decode the enigma code received. The ...
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23 views

Create Custom Packers

I scanned many PE files. Some files are not recognized as packed although they are packed. These are most difficult to reverse. Can you suggest me any tutorial for creating such packers or to pack ...
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78 views

Obfuscated and/or encrypted firmware?

I own 3 samples file of a firmware but I can't determine if it's obfuscated and/or encrypted. Could you give some hint about it? Here is the following samples: Sample 1 Sample 2 Sample 3
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Trying to replicate encryption of an android app

I was trying to replicate/copy the encryption of an android app which uses CryptoJS with sha256 encryption as having seen in the source code of the android app. fingerprinting the app, it was built ...
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Which value is used for verifiying Zip password?

I am studying the way that can be used to check if a given password for an encrypted zip file is correct or not. I see this link: How does a zip file detect a correct password? In the answer of this ...
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Is this algorithm reversable?

b1 = MD5(S + RA)____|____ c(1) = p1 xor b1 b2 = MD5(S + c(1))____|____ c(2) = p2 xor b2 . . . . . . bi = MD5(S + c(i-1))____|____ ...
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41 views

Identify encrypt /decrypt rsa function

I have arm static binary that I know it use RSA. How can I find the encrypt/decrypt function?
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165 views

How can I retrieve the encryption key in this code?

can anyone explain the following code? is it possible to retrieve the encryption key? I think the code was heavily obfuscated in addition to obfuscation, I can recognize it is using algorithms like ...
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How to call strongly encrypted DLL from Resources?

There is a program. This program accepts plugins. Plugins written with C#. I have to encrypt it. But when I use strong obfuscators I have exception. Program doesn't read. How can I fix that ? How can ...
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95 views

NOPed encrypt/decrypt functions in a Path of Exile client and now it crashes without message. Next step?

I am reversing an old Path of Exile client with the purpose of building an emulator. I managed to reach the character select screen in a newer, 64-bit client but I am struggling to make the same ...
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115 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 $2*FuHXY<y5$...
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69 views

Encrypted image format

I am trying to reverse a simple image format for bitmap data with an indexed colour palette. The structure of the file is generally clear and I am able to extract the size of the picture and the ...
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170 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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36 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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1answer
67 views

How to “unprotect” malicious workbook without knowing password

Right now I'm looking at an office document (most likely rtf based on it exploiting equation editor) that opens just fine when you double click it, but on further examination in a hex editor and in ...
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31 views

Linux encryption/luks/pymouth password scripts corruption

I noticed that the bootup scripts that collect the password for full disk encryption on linux (fedora-31) were displaying corrupted text. The kind that looked like binary data being printed at text: ...
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126 views

Python self decryption script, as mean of obfuscation

I have a software with an embedded python interpreter. The software can open upon startup a given .py script and execute it. Let's assume that in my python environment I can't open other files, and I ...
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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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261 views

Is there a way to confirm and decompress files that I suspect are compressed with a very early format of PKZIP?

I have a very large number of files (tens of thousands) who's binary all begins with 0x00 0x06. They do not open with 7-ZIP. I notice also that all Office files seem to share the same next 32 bytes. ...
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100 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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267 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 ...
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248 views

Way to know if firmware is compressed

I dumped a wifi firmware of ps3 console but it seems that this firmware is compressed. Here you can have some informations : https://www.psdevwiki.com/ps3/Wifi_Firmware What can I do to decompress it ...
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94 views

Strings weirdly split in binary

Recently I have come across a few parts in a binary that looked odd to me, and I wanted to ask if this is something common compilers do, and if there is a way to undo it. (The binary is from a raw ...
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279 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 ...
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404 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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100 views

Need help identifying a -possibly- encrypted string

I'm having some trouble building an app that gets data from a database to keep a log of files added to a website. Most URLs are generated from a file ID and a time stamp, some of those URLs are ...
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208 views

How to identify the encoding performed on this string

I have an old application that stores the username and password in plaintext but encoded by an unknown encoding algorithm to me, it seams like base64, but I think it's not, It seams that any word ...
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114 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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181 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
1k views

how can i decrypt huawei HG531s v1 config file?

I have tried to follow this guide but libxmlapi.so didn't have the required ATP_GetInfo1 function so i moved to the next file libhttpapi.so it had ATP_GetInfo1 ATP_GetInfo2 ATP_GetInfo3 ...
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315 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: ...
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277 views

String Encoding and Decoding Method

so I came across the following string encoding method in python. def encode(the_string): encoded_string = '' rotations = ord(the_string[-1]) + 5 for i in range(0, len(the_string)): ...
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113 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 ...
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168 views

me_cleaner and fwupd, or manipulating UEFI .cab files

I'd like to extract a plain dump of the UEFI firmware of my laptop (1:1 copy of the flash content, often called .bin or .rom files) from the .cap file, so that I can modify it slightly with me_cleaner....
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133 views

Tool to search known hash/encryption algo in files in Windows

I am looking for a tool (the best would be an Ida plugin) that can search files in a folder for a known hash (md5/sha1 etc.) and encryption (aes /rsa etc.). I know an Ida plugin called FindCrypt2 but ...
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82 views

Where can I go to learn about decryption? [closed]

I understand the basics of encryption and decryption, but I don't know where to go to talk to people and learn more. Are there any forums or resources to look at to learn more? For example, I was ...
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2k views

XOR encryption - How to find the key?

I'm trying to solve a crackme which basically uses a XOR encryption scheme in which the password is used as the key to an encrypted buffer which is subsequently executed. The following is the ...
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431 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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1answer
457 views

Reversing a Java digest function, with known public key and source code

A Java application verifies that an XML string that came from a clearnet server (no SSL) has not been tampered, using a message digest. It does so with a public key stored locally, accessed with the ...
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224 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 ...
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1answer
160 views

Algorithm to find secret cipher S-box in bin file [closed]

Is there any algorithm that searches through binary file and detects existence of secret S-box built from look-up table (4 bit or 8 bit)? Consider the sbox is unavailable for public The attached bin ...
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666 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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188 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 ...