Change ZPaq header to have my own compression

[compressor]

Hi
I am new and beginer in this awesome world of encryption !
I am looking for a way to change the header of zpaq without damaging the file it self for compress/decompressing ?

Why ? in order to avoid any other person decrypting it and have my own version of this amazing archiver !
I know that there a password protection ... but i don't want go this way.

And the main reason too, that i don't want that other archivers like peazip, winrar etc ... be able to read archived files from zpaq (i want have my own extension).

Any idea or approch please ?

[Matt Mahoney]

The most secure way would be to hard code the encryption key. On zpaq.cpp line 1172:

  password=0;  // no password

change 0 to a 32 byte random string.

[compressor]

Thank you sir for your answer and your awesome open source archiver !

This way only the content of the file that will change no ?

Is there a way to change the header for both Encryption/Decryption to have my personal archiver ?

I managed to use password to encrypt it with AES but that will no prevent other from knowing that it archived with ZPAQ.

[compressor]

Any idea on how to process ?