self-keygen tutorial by synack

previously, i posted a keygen tutorial and challenge, and synack has put his solution forward along with an interesting tutorial on creating a self-keygen, or a keygen that makes use of the original code to do the heavy lifting. it's very clearly written and organized, with plenty of good insight into the thought process as opposed to low-level "click here change this with no idea why" style tutorials.

download the solution and tutorial here: http://www.mediafire.com/?wzc45p269bcpbr5

keygen tutorial and challenge by zAWS!

keygen'ing as a style of cracking requires you to really know and understand how the protection works. it also requires no modification of the original application, so is a very pure way of cracking.

zAWS!, who posted a keygen for lesson 0's crackme0b, sent me this challenge to share:
http://www.mediafire.com/?5ik1659n1k514f9


but before you start, you may want to see his/her keygen tutorial. it comes with the original apk and has videos showing the process:
http://www.mediafire.com/?ckvuiadh5cegl9l

way of the android cracker 0 rewrite

i have learned a lot since first writing way of the android cracker so i rewrote it. actually i rewrote it about 17 times. this one was the least annoyingly pedantic.

here's a direct link: http://www.mediafire.com/download.php?5ybhkqbzwguubf3

lesson 1 rewrite is next.

update: crackme0b has been updated. thanks to zAWS! for writing a keygen for crackme0b so quickly (even copied the icon) and helping me see it. unfortunately the update breaks the keygen.