SD Card Proprietary File Format

Projects General Guidance
1

Hi All,

I'm making a data logging device using Arduino Uno Rev3 and an Adafruit SD Card data logger shield and Real Time Clock.

I'm currently saving the files as text files using logfile.print() commands.

I don't want people editing the files after they have been created and moved onto a PC using the SD card.

I'm interested in stopping someone with basic computer knowledge from editing the file.

So my question is: Is there anyway to save files to the SD card from my data logger in some Proprietary File Format so that I can stop the average computer user editing the file?

Cheers

Steve

2

Set the readonly attrib. Make it hidden. Give it a misleading file extention.
Use win7s file encrypting.

3

Make them binary, not text.

ROT13 them.

4

Use octal, hex or base 36.

5

Thanks guys, I'm still learning arduino so don't understand, how do I change the read only property and how can i save as a binary file?