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What is encryption?

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What is encryption?

bja888	14 Sep, 2005 - 01:06 AM Post #1
D.I.C Head Joined: 9 Sep, 2005 Posts: 94 My Contributions	I decided I don't want people who log into my blog to have passwords sent online via a http header. So I made a crude type of encryption. I want to know what real encryption does and how far mine is from the real thing. Mine... Takes the string (password). Converts it to its ASCII char code (ie. 117 = u). Then takes the char code and adds it to a array of 8 random numbers 0 to 9. It takes the result of the char code plus random then multilpys it by a nother random number (0 to 9). Then it takes all the numbers and adds them togeather. Server-side... Being how its not possable... I do not try to "decrypt" the number vaule. The server "encrypts" the string in the database and checks to see if they match up.
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Amadeus	14 Sep, 2005 - 05:37 AM Post #2
g++ -o drink whiskey.cpp Joined: 12 Jul, 2002 Posts: 12,176 Thanked 33 times Dream Kudos: 25 My Contributions	That is certainly a valid method of encryption. As to if you are close to real encryption, there is no one method of encryption, so your method is valid (although you may not wish to publicize it). While there are many generally accepted standard encyptions and related algorithms, encryption itslef merely refers to disguising the data. This site provides some good resources for learning about cryptography.
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bja888	14 Sep, 2005 - 08:29 AM Post #3
D.I.C Head Joined: 9 Sep, 2005 Posts: 94 My Contributions	QUOTE(Amadeus @ Sep 14 2005, 06:37 AM) (although you may not wish to publicize it). What's the danger? If you cant decrypt it, why should I worry about other people knowing it?
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Nova Dragoon	14 Sep, 2005 - 08:35 AM Post #4
The Innocent Shall Suffer, Big Time Joined: 16 Aug, 2001 Posts: 6,128 Thanked 4 times Dream Kudos: 515 Expert In: Python, Linux My Contributions	QUOTE(bja888 @ Sep 14 2005, 10:29 AM) QUOTE(Amadeus @ Sep 14 2005, 06:37 AM) (although you may not wish to publicize it). What's the danger? If you cant decrypt it, why should I worry about other people knowing it? but you can break it, that is a very weak encryption mechanism
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Amadeus	14 Sep, 2005 - 08:36 AM Post #5
g++ -o drink whiskey.cpp Joined: 12 Jul, 2002 Posts: 12,176 Thanked 33 times Dream Kudos: 25 My Contributions	No real danger at all...given what was published...had you inlcuded more information, such as the method you used to generate the random numbers (as such generators are often not random), that might give someone enough to begin work on breaking it... Just a personal preference, not a rule...
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supersloth	14 Sep, 2005 - 08:37 AM Post #6
serial frotteur Joined: 21 Mar, 2001 Posts: 19,518 Thanked 11 times Dream Kudos: 2147483647 Expert In: being gentlemanly My Contributions	its because telling people how you encrypt information enables users to reverse what you did (de-encryption), and a low-level encryption like what you created is easy to do that too.
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Nova Dragoon	14 Sep, 2005 - 08:46 AM Post #7
The Innocent Shall Suffer, Big Time Joined: 16 Aug, 2001 Posts: 6,128 Thanked 4 times Dream Kudos: 515 Expert In: Python, Linux My Contributions	The common encrpytion PKI is public. The way it is secure now is breaking it depends on generating really large prime numbers. And iirc algorithms to do that either run at very high polynomial time, or probably exponential time. So its is possible to break PKI, it just requires a mad amount of cpu time. Where as yours would require linear time or small polynomial time, since I assume that you are not generating random number client side, then generating another random number server side, that that random number is common and has to be transfered.
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bja888	14 Sep, 2005 - 09:02 AM Post #8
D.I.C Head Joined: 9 Sep, 2005 Posts: 94 My Contributions	So it can be decrypted.... Given someone knows how to intercept http requests. Which as far as I know can be done but isnt a real threat. It's for a blog, not like I will be accepting credit cards through it.
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skyhawk133	14 Sep, 2005 - 09:15 AM Post #9
Head DIC Head Joined: 17 Mar, 2001 Posts: 14,846 Thanked 45 times Dream Kudos: 1650 Expert In: Web Development My Contributions	I think you should be just fine. And good on ya for creating something like that!!
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lattyware	15 Sep, 2005 - 11:58 AM Post #10
D.I.C Head Joined: 8 Aug, 2005 Posts: 55 Dream Kudos: 75 My Contributions	XOR and MD5 - take a look.
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supersloth	15 Sep, 2005 - 12:11 PM Post #11
serial frotteur Joined: 21 Mar, 2001 Posts: 19,518 Thanked 11 times Dream Kudos: 2147483647 Expert In: being gentlemanly My Contributions	XOR is just a mathematical expression for 'AND OR'. it isn't an encryption algorithm like md5.
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Nova Dragoon	15 Sep, 2005 - 01:27 PM Post #12
The Innocent Shall Suffer, Big Time Joined: 16 Aug, 2001 Posts: 6,128 Thanked 4 times Dream Kudos: 515 Expert In: Python, Linux My Contributions	QUOTE(supersloth @ Sep 15 2005, 03:08 PM) XOR is just a mathematical expression for 'AND OR'. it isn't an encryption algorithm like md5. actually it is both, just really really weak encryption ^ = xor x^5 = y y^5 = x magic!
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