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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Power & Revolution help [closed]

Hi guys I try to translate Power & Revolution to Turkish but when, I try to open the files with Notepad++ and Hex Editors they look like encrypted so I cannot read what writes inside.What should I ...
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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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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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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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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
59 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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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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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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224 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 ...
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1answer
62 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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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 ...
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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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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 ...
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134 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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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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1answer
155 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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99 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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2k views

TP-Link encrypted backup file TX-VG1530

I have been trying to wrap my head round this stuff so bear with me. I have a Tp-Link TX-VG1530. From the gui you can download the config file however the file is encrypted, I include a portion of ...
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81 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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Driver's Licence Last Name Numbering Format (Ontario, Quebec, New Jersey)?

So I found out that Ontario Driver's Licences have the following format: LXXXX - NNNIY - YMMDD L - first letter of last name XXXX - number referring to your last name NNN - number referring to your ...
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1answer
616 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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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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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 ...
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2answers
185 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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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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247 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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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 ...
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10k views

ZTE encrypted backup config file

I was poking around in ZTE Speedport Entry 2i (CPE used mostly in Germany, Slovakia etc, probably custom made for Deutsche Telekom). It's possible to download backup of config from UI. I found out ...
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1answer
143 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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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 ...
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1answer
264 views

Which encryption/decryption algorithm is used in Synology Cloud Sync format 3.0 session key and data encryption?

Background: Based on general information in a whitepaper from Synology, I have reverse engineered the specifics of their Cloud Sync encryption algorithm; see synology-decrypt for details. In this ...
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Decoding New Jersey Driver's License Codes

Driver's License numbers in New Jersey aren't random. They follow the format: Affff lllii mmyye, where A is the first letter of the person's last name, ffff is some mapping of the remaining letters of ...
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1answer
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Assistance in Decrypting Lua script that is obfuscated with Base64 > SSL

Can anyone on here help me on decrypting the SSL encryption that protects this LUA script linked at the end of this topic ? Basically they are encoded with Base64 then SSL, but I have no idea how to ...
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99 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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125 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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1answer
64 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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718 views

Debug an application for analyzing file decryption

I have an encrypted raw data file generated by an application. This file is used in a second application to generate a readable text file based on the raw data. I need to change a few values in the ...
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1k 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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1answer
324 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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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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1answer
128 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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Protect data stored in binary

Let's say I've some function(i.e. hash function), that generates value from input seed and some precomputed hash values, that are stored somewhere in binary. What are the possible approaches for: ...
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1answer
472 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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1answer
121 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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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 ...
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1answer
92 views

How to use Python while debugging in IDA

I'm debugging an .exe file in IDA. At a specific point during debugging, I want the Python code to automatically take the data in *(eax+8) and encrypt it with that module and print the result to file ...
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1k views

How to install ida plugin to identify encryption function

I saw here How to identify known encryption algorithm? the IDA plugin https://github.com/nihilus/IDA_Signsrch I don't understand how to install it . In the INSTALL I saw coppy the plug-in and ...
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2answers
699 views

Android App's hardcoded local keystore password r3versing

Novice Android security researcher here. Recently I was tasked with the task/challenge of exposing a certain app's hardcoded local keystore password. I've decompiled it with JEB2 and obviously within ...