MATLAB decoding 'braille' using a table file to decode input into english. Issue with string being returned as a double + possible incorrect use of iterations in for loop? For instance an input of a matrix = [1 0 0; 0 0 0] (which is equivalent to the first six elements in the table file) will return a double = [97, 0] also, I'm not sure where the zero is coming from I'm lost and would appreciate any hints.

Hello, We would like to protect our MATLAB algorithms and we were thinking of using 'pcode' but in order to understand how protected the code will be I would like to know how this protection system works. I was reading the description in the Mathworks webpage and in some places this method is described as an encryptation (which means a key is needed to decrypt the code) and in some others it was shown as content-obscuring (which we understand as obfuscation like in Java or.NET).

So what it is really? When we use the pcode function, no key o seed is asked so I asume that the same key is used everytime, which will allow MATLAB decrypting the code in any computer without additional information. Is there a key?

Decrypting a message without knowing. MATLAB Answers; File. You will notice that on each iteration of the for loop, your message to decrypt is never the. Caesar Cipher Lab - Part 1. In this lab activity you will use MatLab and a function to decrypt a message that is encoded. You could open the above file in a.

Is this key an static key used by MATLAB? I have read in your forum that MATLAB 'compiles' (may I use this word?) this code to a bytecode which is executed in a virtual machine. So is this process made everytime we use MATLAB (I mean the half-compilation to bytecode and after the final compilation in the virtual machine) or that bytecode and the VM are only used for the pcode?

In that case would it be possible to install the VM simply in a computer without the rest of the tools from MATLAB? I really need to justify if MATLAB's pcode is safe enough for our needs so I would be glad I could have all this information. Thank you for your help.

Matlab's license conditions explicitly disallow a reverse engineering. So the depth of the investigations and the public discussion must be limited to the obvious facts. I have done experiments with P-coded files for the same reasons as you. In modern Matlab versions PCODE produces a different result for each run. This could either mean, that a random key is stored in the P-file or Matlab has a static key and adds some random salt to the P-file.

For an decryption algorithm both alternatives are almost identical, because the decrypted salt can be seen as a key stored in the file. The P-files are much smaller than a zipped version of the M-files. This seems to imply, that the P-files are a kind of byte coded. Hatch Pattern For Autocad. Syncios For Mac Crack. For large M-files with 10'000th of lines opening the P-file the first time is faster than for the M-file.

But this can be an effect of the file size. Because currently the P-code algorithm is not documented, the best reliable assumption is that a weak to very weak encryption method is applied, such that it is more a kind of obfuscation. At least the comments are guaranteed to be removed, such that even a decryption of a large file does not allow to understand the code directly. I've seen even comment free M-files in the FEX which are not usable. Libretto Istruzioni Audi A4. This is a pessimistic point of view. It is based on the fact, that strong encryption methods can be documented in public without reducing the security, but with increasing the trust of the users. This is not a proof, that an undocumented encryption is weak.