Language : C++
Platform : Windows, 32/64 bit
OS Version : Windows 10
Packer / Protector : None

Description :

Hey all,

Here's a new challenge for everyone interested to learn things, I am sure you guys will surely find this interesting. 

some rules for this challenge

• code a valid keygen which can generate multiple valid serial for a given name
• no code ripping from the keygenme challenge is allowed
• if you are able to fish a valid serial, please post that too with a little tutorial. That will be accepted as a valid solution 😉
• top winners will be awarded the source code

@kao I hope that you will attempt this keygen me challenge, and I am damn sure you won't take much long to solve this. But if you do try this, I request to to please enlighten us with your suggestions and may be a tutorial. 

Screenshot :

All the best 👍

keygenme-1.zip

Edited March 22, 20205 yr by Blue
updated the post as per guidelines

@Blue: you have a bug in your crackme that makes keygenning it so much harder. You use string "DE" in 2 places - which is really not good.

 

So, I cheated.

Spoiler

Blue : QURCMC0tREUtLURFLS1ERS0tQkUtLUJFLS1CRS0tQkUtLURF
same serial will work for any 4-letter username.

kaokao : QzBCRS0tREUtLURFLS1ERS0tQjAtLUIwLS1CMC0tQjAtLURF
same serial will work for any 6-letter username.

tuts4you.com : QkVGMC0tREUtLURFLS1ERS0tQURDMC0tQURDMC0tQURDMC0tQURDMC0tREU=
same serial will work for any 12-letter username.

 

Damn! I how I missed that 😢

Btw, it's always a pleasure to get comments from you 🙂

Another bug in crackme - certain part of code will get stuck in eternal loop. For example, try using serial "QzBDMDBCMEJCMEIwREUwRC0tREVDMEFE"

Attached is a keygen + source which works it's way around different issues in keygenme. Except the eternal loop, that is..

 

kg_for_blue_saga_by_kao.zip

kao is also good  R.C.E. skiller. I respect you,too.

regards.

sean.