Decrypt P File Matlab Functions

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  1. Matlab P File Decrypter
  2. P File Extension
  3. Function File Matlab

TomSym has the ability to analyze p-code for possible performance improvements and validation. The following example illustrates how TomSym can be used: 1. Create a file called pcodetest.m with the following text: function y = pcodetest(a,b) y = sin(a)+b.^2-30.

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Is there a way to open a pcode file (.p) in MATLAB?

Herr von Wurst
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  • But even if the file is securely encrypted, you can still use the debugger to step through the code of the loaded P-file line by line and record the input and output of all calls to builtin or user-defined functions. Decrypt P File Matlab.
  • The arguments F1, F2. Must describe MATLAB functions or files containing MATLAB code. If the flag -INPLACE is used, the result is placed in the same directory in which the corresponding file was found. Otherwise, the result is placed in the current directory. Any existing results will be overwritten.
ElmoyaElmoya

1 Answer

If by 'open' you mean edit - then certainly not. 'p' in pcode is for 'protected' - its main design goal is deploying a functional component while protecting its source.

If by 'open' you mean run - then certainly yes. Quoting the manual:

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You invoke the resulting P-code file in the same way you invoke the MATLAB .m source file from which it was derived. For example, to invoke file myfun.p, type

[out, out2, ..] = myfun(in1, in2, ..);

Ofek ShilonP file extensionOfek Shilon
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Matlab P File Decrypter

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P File Extension

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Function File Matlab

CS 534 - Steganography Project‎ > ‎

3. MATLAB Code and Examples

The MATLAB files we developed for this project are all available below in the 'Steganography_Code.zip' file. Below is a brief description of what these files do and how they work.
Steganography:
This function is an easy-to-use User Interface function that guides a user through the process of either encoding or decoding a message into or from within an image respectively.
Inputs / Outputs:
- No Inputs Required. User instead is prompted to provide necessary information.
- Automatically saves the cover image with encoded message as a Bitmap image or saves the decoded text or image message as a TXT or Bitmap file respectively.
- Returns encoded image or decoded message as a variable within MATLAB.
Features:
- For Encoding, the user selects an image to hide the message within from a file list and then selects a text or image file message from a file list. The program then prompts the user to decide upon an encoding method, encryption key and random seed key before passing this information to the other functions. Finally the function will return the results as a variable in MATLAB as well as prompts user for an output image name and automatically saves the image to prevent message corruption.
- For Decoding, the user selects the image containing the hidden message from a file list. The program then prompts the user to provide the encoding method, encryption key, and random seed key before passing this information to the other functions for decoding. Finally the function will return the results as a variable in MATLAB as well as prompts the user for an output file name before it automatically saves the output message file.
Stegancoder:
This function determines the message type (text or image file), prepares header information to be used in the decoding stage, and sequentially encodes the message within the pixel values of the cover image.
Inputs / Outputs:
- Requires a cover image, text or image message, and encryption key as Inputs.
- Returns an image which has the message sequentially encoded as Output.
Features:
This function first determines the message type and length and encodes this information as header information (first 72 pixel values). Then the function sequentially encodes the message values across the Red, Green, and Blue Channels in a specific order defined within the function. This means that every message using this function is encoded from the Top Left pixel and is coded from Top to Bottom, Left to Right. This is considered less secure than a Random Encoding (see Stegancoder_Rand) but was simpler to code.
Stegandecoder:
This function recovers a sequentially encoded message that has been prepared using the Stegancoder file. This file takes in the cover image and encryption key, decodes the header to determine the message type and message length, and sequentially decodes and recovers the message from the pixel values of the cover image.
Inputs / Outputs:
- Requires the encoded cover image and encryption key as Inputs.
- Returns the decoded text or image message as an Ouput.
Features:
This function sequentially recovers the message values from the cover image by first isolating the header information (first 72 pixel values) to determine message type and length. The function then proceeds to decode the message using the length information from the header, uses the encryption key to decrypt the message and returns the message.
Stegancoder_Rand:
This function determines the message type (text or image file), prepares header information to be used in the decoding stage, and randomly encodes the message within the pixel values of the cover image.
Inputs / Outputs:
- Requires a cover image, text or image message, encryption key and random seed key as Inputs.
- Returns an image which has the message randomly encoded as Output.
Features:
This function first determines the message type and length and encodes this as header information (first 24 randomly encoded values). Then the function uses the randperm function to randomly select pixel locations to encode the message within. To do this the function determines the dimensions of the cover image , multiplies the dimensions together to provide the number of pixels available and uses randperm to randomly permutate a list that includes values from 1 to the total pixel values available in a predicatable and repeatable way by using the same random seed key value. This ensures that we don't overwrite message values in the cover image and can recover the message during the decoding stage (see Stegandecoder_Rand). The function then uses the randperm list to encode the message values in the cover image. This function is faster than the Stegancoder because the pixel locations are precomputed rather than encoded using counters as well as more secure because the message is encoded across the entire image instead of the left portion of the image.
Stegandecoder_Rand:
This function recovers a randomly encoded message that has been prepared using the Stegancoder_Rand file. This file takes in the cover image, encryption key and random seed key; decodes the header to determine the message type and message length; and decodes the randomly encoded message from the pixel values of the cover image.
Inputs / Outputs:
- Requires the encoded cover image, encryption key, and random seed key as Inputs.
- Returns the decoded text or image message as an Ouput.
This function uses the random seed key to initialize and recover the random pixel locations using the randperm function. The function first determines the cover image's dimensions to determine the amount of pixels available before determining the permutated pixel locations using randperm. Next the function recovers randomly encoded message values from the cover image by first isolating the header information (first 24 randomly encoded values) to determine the message type and length. The function then proceeds to decode the rest of the message using the length information from the header, uses the encryption key to decrypt the message and returns the message.
To Commemorate the University of Wisconsin's Founding, we will use July (7) 26, 1848 for our Encryption and Random Seed Keys in the examples.
To make it easier to access the examples, save and load the 'steganography_examples.mat' file to directly load the variables to your workspace. Otherwise you can save the images below to find the hidden messages. Enjoy!
Variable: capitol_msg
Variable: bascom_msg
Variable: red_gym_msg
Random Seed Key: 48
Variable: camp_randall_msg
Random Seed Key: 26
Steganography_Code.zip
steganography_examples.mat