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

[Johnny Rosenberg]

2014-01-26 Nils Kassube <kassube at gmx.net>

> 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
> > ©ØßãÞž„ÇÐåßÛ |
> >
> > 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.
>

And only with English text… [a-zA-z].


>
> > > 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
>
>
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