Re: creating byte[] with subfields

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 20 Jan 2013 12:51:49 -0500
Message-ID:
<50fc2eb5$0$287$14726298@news.sunsite.dk>
On 1/20/2013 12:46 AM, Daniel Pitts wrote:

On 1/18/13 11:24 PM, Roedy Green wrote:

On Fri, 18 Jan 2013 15:16:45 -0800, Daniel Pitts
<newsgroup.nospam@virtualinfinity.net> wrote, quoted or indirectly
quoted someone who said :

FWIW, XOR encryption is more like XOR obfuscation. It doesn't actually
encrypt, at least not the naive approach to it.


It depends. I just finished a project which I will be permitted to
release into the public domain in a year which uses one time pads,
which XOR messages with strings of truly random bits.

The only way you can crack it is to crack the machine at either end or
intercept the key transfer. You can't do it just by studying
messages.


It really does depend.

If the plain-text are formed poorly (eg. plain ascii text, or contains
any well known substrings), and the key is sufficiently small (needs to
be repeated several times)


A one time pad by definition has a key size equal to message
size so the key does not repeat.

Arne

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