PureBasic Forums - English

I am planing to encrypt some preference files in my program, so that the users can not read them. What method or what commands from the Cipher library can you guys advise me?

Greetings,

es_91.

If the sole purpose is to hide the information from the user, just use a simple
byte rotation or Base64 encoding. Of course advanced users can easily
decode this and change the settings file.

Actually encrypting the content requires a key that needs to be stored in "plain text",
since the application needs to be able to decrypt it. That means if the user can get
a hold of the key, he can decrypt the content.

What I'm trying to say is, it doesn't make sense to do that as it can be worked around
quite easily and offers no real protection.

I understand. I was not looking for complete protection, just a little chicane for the user. I think I will use bit rotation. Thanks.

Just use CompressMemory() before saving to file.

The problem is you can't do OpenPreferences from memory, a file is needed.

In this way, after decrypt, you need to save the file in plain text somewhere, and then delete it when used, that's not a good encryption system.

Another way is encrypt only the values ​​of each of the preference lines:

If you want to hide the "name" of the preference, just use an array, and a loop...
(not checked for syntax)
for loopcounter = 0 to #PrefCount
writepreferenceinteger(file, "Pref"+str(loopcounter), prefarray(loopcounter))
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