Comments on: YACoSTO http://blog.didierstevens.com/2006/07/31/yacosto/ (blog 'DidierStevens) Wed, 08 Feb 2012 19:23:01 +0000 hourly 1 http://wordpress.com/ By: D0R http://blog.didierstevens.com/2006/07/31/yacosto/#comment-33584 Thu, 16 Oct 2008 13:36:57 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-33584 Just discovered your blog and this great post!
So your friend had to pretend he never got this analysis from you, right? Because otherwise, as a professional, he should refuse to use the “encryption” tool (*) made by the company to deliver confidential data to them.
This story is a shame, the company deserves a lawsuit.

(*) Better call it an “obfuscation” tool.

]]> By: Didier Stevens http://blog.didierstevens.com/2006/07/31/yacosto/#comment-33374 Sat, 23 Aug 2008 12:06:20 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-33374 Well…

They had developed the program themselves, and they saw now problem with it…

]]> By: J_Tom_Moon_79 http://blog.didierstevens.com/2006/07/31/yacosto/#comment-33369 Sat, 23 Aug 2008 00:18:18 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-33369 Terrific work and great write-up! And thanks for all the helpful links.

I was, out of curiosity, wanting to analyze the entropy of my AxCrypt encrypted file (AxCrypt is great, btw). The CryptoTool you linked is perfect for the job.

So I’d love to hear what happened when your friend reported to the bank that they got scammed.

-J_Tom_Moon_79

]]> By: Adrian http://blog.didierstevens.com/2006/07/31/yacosto/#comment-13765 Fri, 07 Sep 2007 13:10:49 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-13765 Very good. I enjoyed this a lot and learnt about the value of comparing entropy. This one gets filed and saved.

]]> By: Didier Stevens http://blog.didierstevens.com/2006/07/31/yacosto/#comment-12634 Mon, 13 Aug 2007 20:35:18 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-12634 The magic bytes sequence.

]]> By: Dj http://blog.didierstevens.com/2006/07/31/yacosto/#comment-12599 Mon, 13 Aug 2007 03:46:27 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-12599 What does the 10 byte header contain ?
I know the first and second bytes are constant and that the third byte is for the mode.. what are the rest for ?

]]> By: YACoSTO, One Year Ago « Didier Stevens http://blog.didierstevens.com/2006/07/31/yacosto/#comment-11877 Tue, 31 Jul 2007 06:04:16 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-11877 [...] Filed under: Reverse Engineering — Didier Stevens @ 6:04 One year ago, to the day, I posted YACoSTO. I explained how I reversed a program that “protects” data. This is one of my favorite [...]

]]> By: Talha http://blog.didierstevens.com/2006/07/31/yacosto/#comment-25 Tue, 01 Aug 2006 14:34:23 +0000 https://didierstevens.wordpress.com/2006/07/31/yacosto/#comment-25 Nice one

]]>