View source for User talk:Ruptor

== Talk History ==

Some people enjoy seeing their own posts on other users' Talk pages and re-reading them over and over again. Unfortunately for them, I prefer keeping '''my''' Talk page clean only showing the '''talks in progress''' on it.

If anyone finds reading outdated conversations to be an exciting way to spend their time, they are welcome to dig those up in the page history. I will keep maintaining my Talk page clean and up to date. If it's against Wikipedia rules, I insist that those rules are changed and everyone is assigned moderator privileges for their own user pages to be able to clean up '''their own''' Talk pages and their own user pages from any nonsense posted on them by unwelcome visitors.

&mdash; [[User:Ruptor|Ruptor]] 16:33, 3 October 2005 (UTC)
: You're certainly free to pursue whatever cleanup strategy you like on your talk page (although, as ciphergoth pointed out, there's a culture of doing things a certain way, and some strategies will be interpreted in certain ways). I'd encourage you to read the [[Wikipedia:Civility|Civility]] and [[Wikipedia:No personal attacks|No personal attacks]] policies, though. Comments such as "nonsense posted by unwelcome visitors" are unnecessarily antagonistic. Wikipedia is a place where people inevitably have to work together on things. Because of this, we need to afford each other a basic level of courtesy and respect. [[User:Matt Crypto|&mdash; Matt <small>Crypto</small>]] 16:53, 3 October 2005 (UTC)

==Initialisation Vector==

(Hi Ruptor, I know this is old, but I wasn't sure if you saw my response, so I just thought I would copy-and-paste it.  Feel free to delete this "discussion".)

Hello, Michael! Thanks for taking time to contribute to the IV page. I just wanted to discuss your correction. I'm sure you'd agree that the recepient does need to know the IV to be able to decrypt the message. It was just probably worded incorrectly. The recepient doesn't necessarily need to ''receive'' the IV when it can be simply ''calculated'' or ''measured'' - the IV can be current time for instance, if it's properly synchronised. &mdash;[[User:Ruptor|Ruptor]] 16:40, 18 October 2005 (UTC)

Hi Ruptor,

Yes, I agree it was just a combination of ambiguous wording and my own ignorance.  I realized this soon after, agonized over my change, and nearly reverted it.  I'm glad, though, that it prompted you to add to the page, because I think your explanations really help.

However, I do think there is a key point about an IV that may be worthy of explanation in the Wikipedia article.  There are really two ways to think about, or describe, what an IV is.  (NB: I don't have much experience with stream ciphers, so this pertains to block ciphers only.  Does a similar dichotomy exist with stream ciphers?)

The first view, the "IV as initial input" view, is what is described in your article.  The IV is a block of data that is used to initiailize the feedback register.  Here, it is obvious that the receiver needs to know the IV, since an encryption algorithm in feedback mode requires this input to operate correctly.

The other view, the "IV as salt" view, is that the IV is simply some random data that is included at the beginning of the plaintext, so that when encrypted (in feedback mode), the resulting ciphertext is unique.  In this case, the feedback register is initialized with zeroes.  Here, the receiver does not need to know the IV beforehand -- instead, the IV (as salt) is what the receiver sees as the first block after decrypting.

It seems clear that these two views are equivalent; the "IV as input" is merely the encrypted "IV as salt."  (Note: If "IV as salt" doesn't really exist -- that is, if the distinction between "IV" and "salt" is clear to everyone, then either I am dense or the texts that I have read are poorly written, or both.)

I can understand why "IV as input" is the normal view, though, since it gives an implementor freedom to calculate the IV as they choose, and you nicely describe various ways that it can be computed.  This freedom allows you to avoid, in some cases, the overhead of sending an extra block of encrypted data.

However, perhaps that is also the freedom to hang oneself?  Schneir stresses in Applied Cryptography that the IV (as initial input) is not secret.  So it seems to me that "IV as salt" has a minor advantage, in that the IV (as salt) is always encrypted with the private key.  Therefore, even if an implementor chooses to unwisely attach semantics to the IV (i.e. it really should be secret), it is at least not available to an attacker in plaintext.  Granted, since the feedback register is zeroed when encrypting the salt, the IV itself is exposed to the same attacks as ECB mode.  With "IV as input," you can achieve the same protection as "IV as salt" by encrypting (in ECB mode) the IV.  But I wonder how many people are actually doing that?  It didn't even occur to me until just now.

[[User:Michael Birk|Michael Birk]] 23:27, 28 October 2005 (UTC)

:Hey, Michael! Thanks for your feedback. I'm not sure if encrypting IVs achieves much, but their general position is to be known to both parties and to ensure that two streams are always encrypted differently even if the same key is used. It's done primarily to save time on re-keying. I'm not sure if you've noticed it, but all the encryption modes of ''''block'''' ciphers that require IVs are all modes of operation that transform block ciphers into ''''stream'''' ciphers. If you dig in it long enough, you'll see that the IVs are specific for stream ciphers (or block ciphers turned into stream ciphers with one of the block chaining modes of operation). &mdash; [[User:Ruptor|Ruptor]] 16:26, 16 October 2006 (UTC)

== Be Cool ==

I agree with the [[WP:RPA]] guidelines and I keep my talk page clean by simply removing everything that I consider to be a [[Wikipedia:No_personal_attacks|personal attack]] or [[Wikipedia:Libel|libel]]. &mdash; [[User:Ruptor|Ruptor]] 16:38, 17 October 2006 (UTC)

==Your edits to [[Talk:VEST]]==
To get my point across, I have done some "censoring" on your comment &mdash; and I didn't even change any of your text! Please don't take any offense, it's just a prank. Of course you are welcome to revert me. :)
<small>(I hope I don't get chastised for [[WP:POINT]]...)</small> -- [[User:Intgr|intgr]] 22:54, 25 April 2007 (UTC)

:Whatever point you tried to get across by doing that, I didn't get its relevance to what you said before. All I found on the Wikipedia Talk pages policy page that you reminded me of was a confirmation of what I said previously, that those pages being research pages for the articles must adhere to the same policies as Wikipedia articles. So while I agree with you and with the policy of not editing other people's legitimate comments, we cannot tolerate libel. [[User:Ruptor|Ruptor]] 10:03, 26 April 2007 (UTC)

::Don't get me wrong &mdash; I agree with the removal of such comments; I, however, profoundly disagree with '''changing the meaning''' of someone else's comment. -- [[User:Intgr|intgr]] 00:54, 27 April 2007 (UTC)

===Conflict of interest===
I believe that your edits to the [[Talk:VEST]] page are inappropriate for Wikipedia; further, your account is in violation of the Wikipedia policy on Conflicts of Interest ( [[WP:COI]] ).  Please do not continue this dispute in Wikipedia's pages any further.  [[User:Georgewilliamherbert|Georgewilliamherbert]] 02:45, 17 May 2007 (UTC)
:Yes. It is exactly what I insist on in my posts - I just keep asking them to stop using Wikipedia for this dispute and keep deleting it. I will happily stop doing it myself and I would be glad to see it all removed from Wikipedia, including my posts related to it. It's not what I'm here for. Thank you. [[User:Ruptor|Ruptor]] 08:02, 17 May 2007 (UTC)
:I've just read it, very interesting. Of course, if I had read it before, I would have responded differently. What to do... I'm not even sure that editing my own comments would not violate this policy again. What should I do with it now? [[User:Ruptor|Ruptor]] 08:09, 17 May 2007 (UTC)
::I don't think the collective we (Wikipedia's administrators and editors) are going to let them continue it here, either; I've warned them as well, the page is on a bunch of people's watch lists now, and we'll do our best to keep the page neutral and unbiased. I don't want you to feel like I'm just blaming you for it or anything; you participated to some degree, and we want that to stop, but it's not all your fault.  They were active willing participants, and they need to stop that as well.
::If you spot them making biased changes feel free to drop a note on my talk page.  As I said, a bunch of us are watching the page, but we might miss something.  [[User:Georgewilliamherbert|Georgewilliamherbert]] 17:55, 17 May 2007 (UTC)
:::Thanks for explaining me the situation! You've been very helpful. If I had seen the [[WP:COI]] page before, I wouldn't have started that article in the first place. I certainly won't be editing it anymore, but I'll keep an eye on it. [[User:Ruptor|Ruptor]] 12:58, 18 May 2007 (UTC)

== Contact ==

Please drop me a message when you have a chance. [[User:Maxal|Maxal]] ([[User talk:Maxal|talk]]) 12:49, 4 October 2013 (UTC)

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