Reverse Engineering Stack Exchange
Reverse Engineering Stack Exchange

Questions tagged [encodings]

A mapping of a given code to values or semantics. Guessing the meaning of an encoding requires a lot of trials but some encoding are standard and can be guessed quite easily.

102 questions
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How should I approach reverse engineering this text encoding?

So I'm trying to hack the translation from the PS4 version of a game into the Vita version. The script files were conveniently uncompressed, and I was able to drop them in and have it working without a hitch - great! However, various other message…
Celandine Crane
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Storing barcodes as ASCII

I am currently looking at a TIFF file generated by a microscope vendor. They store an XML within the TIFF (ImageDescription tag). Within this XML I can find a element. But instead of storing the actual barcode (PDF417, DataMatrix) value,…
tibar
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Reverse engineering and exactly re-creating a QR code

The Casio FX-991EX calculator has a QR code feature for accessing the current equation from another device. It supports version 3 QR codes for some menus and version 11 for most menus. For example, using version 11 with this feature for 1+2 in…
hopperelec
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sub-ghz radio encoding 6 bits

I have a usb stick that communicates with a medical device. I am attempting to decode the communication. I have figured out the basic radio parameters (916.5MHz, ook, bit rate, preamble, sync words), but there is still some encoding I haven't…
raaadio
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Is there a standard character encoding that is ASCII minus control characters?

I came across some unusual strings in some embedded SH2A code I'm analyzing.... 11 53 54 00 53 55 4E 44 41 59 00 4F 46 00 2E 4F 56 45 4D 42 45 52 . S T . S U N D A Y . O F . . O V E M B E R Which I realized is just "1st sunday…
Zhentar
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Recognize this encoding (in a serialization context)?

I am currently trying to reverse engineer a proprietary serialization format. In some of the sections the encoding is unknown to me. What I was able to figure out: 1 byte 0b00?????? "6bit signed int" (0x00 = 0, 0x3F = 63, 0x40 = -64, 0x7F = -1) 2…
Manuel Kasten
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Name for simple character encoding (where '0' is 0x00; 'A' is 0x0A)?

Some old games have a very simple text encoding in which: 0x00 = '0' 0x01 = '1' ... 0x09 = '9' 0x0A = 'A' 0x0B = 'B' 0x0C = 'C' ... 0x22 = 'Y' 0x23 = 'Z' ... 0xFF = string terminator I figure this encoding must be pretty common due to its extreme…
shygoo
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Unsure how LZSS compression is assigning dictionary references

I am having trouble understanding how this LZSS compression assigns dictionary match references. This particular LZSS compression algorithm has a dictionary space of 4096 bytes that are assigned 0 to start. The first index used is 4078, and the…
fishygobyebye
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Invalid "Variation" of a base64 encoding

I am starring at the following which looks like base64 but not…
montovaneli
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What is the URL format for Google Trends?

When you search for the search term Tesla or AOL you get the following URLs: https://trends.google.com/trends/explore?geo=US&q=Tesla But, for the automobile maker, you get: https://trends.google.com/trends/explore?geo=US&q=%2Fm%2F0j6n6s8 So what…
pathikrit
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CD-ROM CIRC encoder

I'm studying the principles of data storage CD-ROM At the moment I understand structures of sectors, F1 frames, F3 frames, subcode channels. But I just can not understand the principle of forming F2…
Shadow
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Decoding Base64 is Garbled

I have a piece of Base64 that I have been tasked with decoding. I am not sure what the resulting output is supposed to be, but it is not an image because it does not decode when I try that, and when I try to convert it to text, here is what I get…
Base64
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Base64 encoding with missing padding and many uppercase letters

Following string looks like base64 to me, but fewer digits or lowercase characters than upper. Some base64 decoders fail decoding it. Could it still be base64? Is there a way to decode…
user2274486
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Reverse engineering a base64 encoded number

I am working on reverse engineering an encoding. A number between -12 and 12, with 2 decimals is encoded using an unknown method, and the result is a pair of strings as follows: value string1 string2 0 AAAAAAAAAA AAAAAAAA 0.01 …
Adrian Man
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Agilent Gen5 files

Does anyone know how to decode these agilent gen5 files for detection (xpt), or know of a tool/script that can extract the information? They have some example files on their…
A Simple Programmer
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