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votes
1answer
74 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
0answers
16 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 ...
0
votes
0answers
64 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 ...
-1
votes
1answer
56 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: ...
0
votes
0answers
48 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
votes
1answer
101 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 ...
1
vote
0answers
236 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 ...
0
votes
1answer
99 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 ...
-2
votes
1answer
326 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
1answer
2k 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
0answers
336 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. ...
3
votes
0answers
566 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
votes
2answers
935 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 ...
0
votes
1answer
150 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 ...
0
votes
1answer
2k 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== ...
1
vote
1answer
424 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 ...
0
votes
2answers
582 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 ...
1
vote
1answer
216 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 ...
4
votes
1answer
1k views

Having keys and binary, how do I reverse/decrypt a stream encryption?

I would like to ask if you have any idea or approach to reverse engineer a decryption algorithm to find the opposite encryption function. I do have all required keys and fields and of course the ...
3
votes
1answer
404 views

How can I determine if a piece of code is an encryption algorithm?

I am trying to reverse engineer a malware, and came across a piece of code that I suspect is an encryption/decryption procedure, however I do not know for sure. I can recognize that it extracts its ...
2
votes
1answer
720 views

is it possible to decrypt Enigma and RC4 encryptions?

i have been working on a bug for almost a year trying to figure out how i can fix it. the app is suppose to show some message like ("Processing")to notify a user that the main function is executed, so ...
5
votes
1answer
2k views

Question about Keeloq - A car remote control standard

I have a question about Keeloq security. I have an original car remote controller (BFT Mitto 2) and I know this chip uses HCS301 with Keeloq implementation. I would like to clone this remote for my ...
1
vote
1answer
640 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 ...
2
votes
1answer
783 views

How would I go about finding an encryption key or cipher by decompiling a program?

I became curious about how Trend Micro communicated with its servers so I gleaned some of the unique and standard HTTP headers that were being sent back and forth using Fiddler2. I created a winsock ...
0
votes
0answers
324 views

How to identify the encryption in packet data using OLLYDBG [duplicate]

I've been slowly learning the processes of packet decryption over the last 6 or so months, and it's been slow progress. I've found the winsock2 send function in OllyDbg, and I'm using this tutorial ...
1
vote
2answers
301 views

How to find compressed or encrypted parts in a packed executable?

I want to analyze an executable that went through a packer to look for the parts that have been compressed or encrypted. Of course, it also means that I want to find the code for the decompression or ...
2
votes
1answer
293 views

How to retrieve stored information, NAND filesystem with VB.Net

I have been reading and reading about NAND and NOR flash.I am wantina (Usualy 512 bytes) to access some stored information in a nand.bin file but cannot for the life of me figure out what I need to do ...
10
votes
4answers
14k views

AirPlay Mirroring decryption (FairPlay)

I've been spending a good chunk of time looking at some 3rd party applications that were successful in "reproducing" (although I believe not necessarily by understanding the algorithm completely but ...
2
votes
1answer
966 views

Identify decompiled decryption algorithm

I'm trying to analyze a decryption algorithm I'm reverse engineering and am wondering if anyone would from looking at the logic be able to identify one of the standard/common ciphers people use. The ...
0
votes
0answers
834 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 ...
7
votes
2answers
2k views

Virus uses a custom XOR encryption and need help possibly cracking it / Reversing EXE

As stated in my previous question i was infected by a encrypting virus that encrypts two 1024 byte blocks of any given file (First 1024, and last 1024) in some type of custom CFB XOR encryption. I ...
5
votes
2answers
2k views

Retrieving encryption/encoding logic from dll

I am trying to retrieve a decrypting/deconing logic from a program. Unfortunately I have virtually no experiencing in reverse engineering. I am building an alternative controller application for a ...
4
votes
1answer
287 views

What does this Generate_Key_IV assembler routine?

I want to decompress some files, and found some information on how. Apparently they are encrypted with AES 128 in CFB mode, and sometimes compressed using ZLIB. Each file's key and IV is supposedly ...
1
vote
1answer
1k views

Reverse Engineering an Encryption Algorithm

I have a program that has the ability to encrypt files and I want to be able to create a program that can read these files. I believe it uses a Blowfish encryption, but I'm not certain on that. How ...
11
votes
3answers
5k views

Totally unknown file analysis approaches

I guess this is the worst case. I have a file which was initially base64 encoded. This step was easy. But now all I can see is a bunch of rubbish. No structure, nearlly a maximum of entropy, no ...
-3
votes
1answer
204 views

Is it possible to get the encryption key when you have the plain text [closed]

i have a question about SHA256 I know that this algorytm was used to encrypt a text, wich i have, also i have the encrypted version of this text. My question is can i somehow get to the encryption key ...