Erjey's Logics

[LoLLo90]

Difficulty : 4/10
Language : .NET
Platform : Windows
OS Version : All
Protection : Find out

I am back again with this little baby...

Goals :

Find the valid ID!

This is not a bruteforceme! It is absolutely possible to get the ID without bruteforceing!

Patching is not allowed!

Erjey's Logics.rar

Just to clarify: the given key is the same on all computers and the goal is to find the right id for the key that i have chosen.

Edited August 13, 2016 by LoLLo90

[Teddy Rogers]

Can you please attach a screenshot, thank you...

Ted.

[LoLLo90]

6 minutes ago, Teddy Rogers said:

Can you please attach a screenshot, thank you...

Ted.

Done my friend!

[Ahmad_k]

The application hang when you try to close it. i have to end task in task manager everytime. Tested on WinXP win7 and win8.1

[LoLLo90]

2 minutes ago, Ahmad_k said:

The application hang when you try to close it. i have to end task in task manager everytime. Tested on WinXP win7 and win8.1

Sorry for this, i have messed up something with the closing event while protecting the file!

Btw the keygenme works fine.

[RDGMax]

[LoLLo90]

22 minutes ago, RDGMax said:

 

I said patching is not allowed, if you solved it post the serial, otherwise it is not a valid solution.

Edited August 13, 2016 by LoLLo90

[RDGMax]

here another key + id

 

[LoLLo90]

I can't see the image.

However the key textbox is disabled because you can't change the key. If you changed the key your solution is not valid.

The goal is to find the valid ID for the given key.

EDIT: I saw your image, you changed the key, your solution is not valid.

What part of the statement "patching is not allowed" you don't understand?

Edited August 13, 2016 by LoLLo90

[Ahmad_k]

well the key is the same on all machine !! what's is going on.

you key is the same as mine and same as RDGMax

[LoLLo90]

2 minutes ago, Ahmad_k said:

well the key is the same on all machine !! what's is going on.

you key is the same as mine and same as RDGMax

Exactly!
You have to find the right id for the given key. Nothing more.
 

[Matteo]

Solved

One of the correct keys is: 03400741142341

Nice! I like Erjey's logic behind this crackme 

I will make a tutorial (pdf) for this, see you soon...

greetings from Italy

[kao]

Respect to @Matteo!  

[LoLLo90]

Good job Matteo, talking with you i noticed you are a very smart guy

[Matteo]

As promised (a bit late...) here is the keygen + pdf tutorial.

I completed the tutorial in different times so i hope is decent.

There is an extra bonus: (half) solution with Z3 SMT Solver.

Have fun! and let me know if you like it

Greetings from Italy

~Matteo~

Keygen and Tutorial.zip

[cawk]

2 hours ago, Matteo said:

As promised (a bit late...) here is the keygen + pdf tutorial.

I completed the tutorial in different times so i hope is decent.

There is an extra bonus: (half) solution with Z3 SMT Solver.

Have fun! and let me know if you like it

Greetings from Italy

~Matteo~

Keygen and Tutorial.zip

wow thats very nice good job