ubuntu: destroy a huge binary file and make it non-readable.

[Nils Kassube]

Nandakumar wrote:
> Gopanam works in a different way. An 'a' will not be and 'e' always,
> so the knowledge of incidents of alphabets in a language won't be
> sufficient to decrypt the data.
> 
> For example
> 
> Hello, World!
> changes to
> ©Øßãޞ„ÇÐåßې|
> 
> with the key 'password'
> 
> Note that the consecutive 'l's are not encrypted to same.

Right, that's what I would expect from a real encryption program. My 
expample of the Caesar cipher was used because that is something one can 
understand even without a computer. And of course this simple program 
would only work with text, not with data.

> > OK, I understand. But I think even a simple cipher technique will be
> > enough for BINARY files.

That depends - if the original data are e.g. construction details of a 
brand new machine which should be used for a patent application, someone 
finding the data might have incentive enough to pay a cryptographer to 
decrypt the encrypted file.

> > (As a fun, I'll change the statement 'even the developer can't' to
> > 'the developer can't' since I'm not so smarter to decrypt ;) But
> > I'll
> > try to become smarter!)

:)


Nils