Decrpytion ? any Books or links ?

Question

help !!

Answer 1

you should start with THE de facto cryptography book, see source.

if you just want an app to do it for you, good luck, as to do this you'd need to write your own software.

unless this is something like a .zip file with an easily broken password.

Answer 2

There are literally millions of sites with info on that subject. If you were more specific someone might be able to actually help you.

Until then, http://www.google.ca