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

[Nandakumar]

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.

On 1/26/14, Nandakumar <nandakumar96 at gmail.com> wrote:
> OK, I understand. But I think even a simple cipher technique will be
> enough for BINARY files.
> (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!)
>
> On 1/26/14, Nils Kassube <kassube at gmx.net> wrote:
>> Nandakumar wrote:
>>> >> I'd like to point out that the statement "even the developer can't
>>> decrypt it" is meaningless.
>>> The encryption algorithm simply depends on the key. The key is not
>>> recorded while encryption too. The source code is also open. And if
>>> you read it, you will understand that the only way to hack is trial
>>> and error method. The success of encryption depends on the length and
>>> strength of the key.
>>
>> Sorry, but I can't see the source code at the URLs you provided:
>> <http://nandakumar.co.in/private/filedest> or
>> <https://launchpad.net/gopanam/+download>. But maybe I'm missing
>> something?
>>
>> Anyway, I don't dispute that the encryption works. But it doesn't matter
>> if the key is recorded or not. If the output is not sufficiently random,
>> there may be ways to decrypt it even without knowing the key.
>>
>> To explain why I criticize your statement, let's think of an example:
>> If I would write an encryption program where I use the wellknown Caesar
>> cipher (*), the output may be unreadable for me and any other normal
>> person. Therefore I could state that "the developer can't decrypt the
>> output without the key", but that doesn't mean that there aren't smarter
>> people than me who easily decipher the output using some statistics and
>> knowledge of character distribution in normal languages.
>>
>> As we don't know about the data the OP wants to "destroy", we don't know
>> if the use of a simple encryption like my example might be good enough
>> or if something better is needed. Therefore the statement that "I can't
>> decrypt the output" does not necessarily mean that my program is useful,
>> i.e. the statement is meaningless. And by pointing out that the
>> statement is meaningless I merely wanted to give the OP a hint that this
>> should not be a base for the decision to use the program.
>>
>>
>> Nils
>>
>> (*) The Caesar cipher simply shifts the characters of the alphabet a
>> fixed amount of places, which makes the new alphabet e.g.
>> "cdefghijklmnopqrstuvwxyzab" instead of the normal sequence starting
>> with "a".
>>
>>
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>