Reverse Engineering Stack Exchange
Reverse Engineering Stack Exchange

Questions tagged [decryption]

Process of decoding an encrypted message with an authorized access (knowledge of the protocol, the encryption algorithm and the key).

Decryption is the process of decoding an encrypted message with an authorized access (knowledge of the protocol, the encryption algorithm and the key). It differs from cryptanalysis because you are supposed to detain all the required information for a legal access to the information.

223 questions
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Is it possible to decrypt an SSL connection (short of bruteforcing)?

I'm trying to reverse-engineer a protocol (it's for a game whose server's are closing soon). I have two things: 1) the binary for the program 2) a packet dump from Wireshark (I am still able to get another dump, if needed). Now, the protocol, from…
bobbybee
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Reverse Engineering Quebec Canada PDF417 restaurant bills

Let me explain what I'm trying to do, and then where I am at... As you can see on this image : There is a PDF417 at the end containing a string that at my best guess is some base64 string. Here it is…
user66792
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What is the integrity check used?

I have the following numbers. It is a 14 digit identification number. The first 13 digits (counting from left) are the number itself, the 14th (the least digit) digit is an integrity check code. I tried many combinations but failed to get the…
Yousf
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Decrypt PPPoE password of Huawei ONT HG8145V5

I am trying to get the PPPoE password of my Huawei ONT, model HG8145V5. When I access the ONT user interface and go to WAN settings, I can clearly see the PPPoE username. However, the password is behind asterisks. I tried changing the password field…
Brandon
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Decrypting assets (json/png/lua)

Context I am trying to decrypt a game for its assets for learning purposes. I have extracted out said assets from the game package, they are in formats of .json, .png and .lua. However, they are encrypted. Inspecting the files in hex view, I noticed…
saulgoodman
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Turning an unknown audio data stream into wav or similar format

I am trying to get the commentary (casters voice) from a dota2 game file. I've managed to parse the game file and select what I believe is the voice data. This is in a weird format (CSVCMsg_VoiceData) which has the following struc: type…
user6916458
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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 decimal int[] result; for ( i = 0x33; ;…
Mark Last Jr
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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 packets don't have a standard structure. Example…
Giàu Nguyễn Thanh
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Trouble deparsing Perl encrypted with Filter::Crypto::Encrypt

I am trying to use perl -MO=Deparse to get readable source code from encrypted Perl files. The Perl script I'm trying to deparse starts with use Filter::Crypto::Decrypt;. The error I'm getting is: Can't run with Perl compiler backend at…
TeddyBones
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How to decrypt PPPoE password of Huawei HG8245W5-6T?

Can someone help me to decrypt the PPPoE password from a Huawei HG8245W5-6T fiber optic ont. The password has this format: "$2lT_)L2t{NViWZSYEt@"/qwP82OAN)<s+mv~AVu["$" I tried to decrypt it with the Huawei configuration encryption and…
beo59
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How to decrypt a PIE file for a game's assets?

I want to see the assets for Garbage Pail Kids: Mad Mike and the Quest for Stale Gum I noticed the file was in PIE format. I tried opening them with every program I have, but nothing works; And add insult to injury, the file's encrypted. What do I…
A Geek's Gamestream
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Lossless Rice Compression

I am trying to figure out how the Lossless Rice compression algorithm works on the following file. Here is a DICOM file. Looking at the information I can see: $ gdcmdump I160 | grep "Tamar Compression Type" (07a1,1011) CS [LOSSLESS RICE ] …
tibar
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Trying to decrypt the output from a BLE scale

I'm trying to decrypt the readings from a BLE scale, which seems to be transmitting readings in the manufacturer data. Here are a few readings using python bleak library to scan device advertisements: #no weight on…
Jake Wang
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How to decrypt files given access to the decryption formula (bash) and passwords (Mach-O binary)

I have a decryption formula, the file it links to containing file passwords, and the encrypted files themselves, but I still don't understand how to reverse the process. Question: Do I need any more information to be able to decrypt the files (if…
green
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How to decrypt encrypted script files for a game?

I want to mod Tony hawks underground 2. I noticed that the files in a folder scripts (down the game's directory tree), are all encrypted. Where do I start if I want to decrypt them?
J. Czekaj
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