After loading a P-file into MATLAB, a memory dump of the MATLAB process can be analyzed. The tokenized bytecode resides in heap memory. Tools like Volatility (for OS memory) or Cheat Engine can extract the byte stream. Mapping tokens back requires a token dictionary for that MATLAB version.
There is no official or legal tool provided by MathWorks to "reverse" a P-file into its original M-file. Decrypt P File Matlab Software
Unlike simple encryption, P-files are "content-obscured." Modern MATLAB versions (R2007b and later) use an Advanced Encryption Standard (AES) variant that is not publicly documented. 1. Legacy P-Files (Old Versions) After loading a P-file into MATLAB, a memory
% Given known plain M-file and corresponding P-file (old format) plain = 'a = 1;'; p_bytes = read_pfile('old.p'); key = bitxor(uint8(plain), p_bytes(1:length(plain))); % Decrypt rest of P-file with key Mapping tokens back requires a token dictionary for