Since Android mounts /mnt/sdcard with the 'noexec' mount option the
included binary is usable on so-called "rooted" systems only.

To prepare your phone/tablet to use John the following steps are needed:

1. unpack the provided archive (likely, it's already done since this
   file is a part of the archive);

2. transfer both the content of the archive to your Android device;

3. on your Android device launch some terminal application (e.g.
   ConsoleBot) and become root (by executing 'su');

4. remount /system read-write: mount -o remount,rw /system

5. copy 'john' from the supplied 'system' directory to /system/xbin/:
   cp /mnt/sdcard/<where_you_transferred_the_content>/system/john /system/xbin/

6. fix the permissions: chmod 0755 /system/xbin/john

7. remount /system to be read-only: mount -o remount,ro /system

8. drop root's privileges by exiting the shell.

Now, to execute john, all you need is to:

1. start your terminal application;

2. change directory to the uploaded 'user' directory (you can rename it
to whatever you want, BTW);

3. start john as you usually do, e.g. 'john --test' to see benchmarks.

-- 
(GalaxyMaster)
