SHA256: Difference between revisions

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[[file:computation.png|right|frame|Advanced programming<ref>http://www.flaticon.com/</ref>]]
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  [[File:Exclamation.png]] This is student work which has not yet been approved as correct by the instructor
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[[file:Studying.png|right|frame|Case study notes<ref>http://www.flaticon.com/</ref>]]
SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001.<ref>https://en.wikipedia.org/wiki/SHA-2</ref>. It would be really helpful if you understood [[hashing]] and [[Cryptographic hash|cryptographic hashing]] to appreciate this topic.


== Introduction ==


Please write a clear, concise description of your topic here.You will likely reference your introduction from somewhere else. Please use the following syntax at the end of each of your ideas. '''IT IS CRITICAL YOU ATTRIBUTE''' others work. Your introduction should be factual. No more than 3 or 4 sentences, please. Because you are not an expert in your topic, I expect you to triangulate your information. LOTS OF LINK TO OTHER RESOURCES PLEASE! If you do not use a section, please delete it. Your finished page should only have information which explains your topic.
SHA256 is complex. Watch this video for an appreciation:


<nowiki>
<html>
<ref>the url I cited by material from</ref>
<iframe width="560" height="315" src="https://www.youtube.com/embed/S9JGmA5_unY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</nowiki>
</html>


Please delete any text on the page from our template. The only text on the page should be your work (and the category links on the bottom).


== How does it work or a deeper look ==
Even a small change in the message will (with overwhelming probability) result in a mostly different hash, due to the avalanche effect. For example, adding a period to the end of the following sentence changes almost half (111 out of 224) of the bits in the hash:


* If you are discussing a THING YOU CAN TOUCH, you must explain how it works, and the parts it is made of. Google around for an "exploded technical diagram" of your thing, [http://cdiok.com/wp-content/uploads/2012/01/MRI-Technology.jpg maybe like this example of an MRI]  It is likely you will reference outside links. Please attribute your work.
<syntaxhighlight>
* If you are discussing a PROCESS OR ABSTRACT CONCEPT (like [[fuzzy logic]]) you must deeply explain how it works.
SHA224("The quick brown fox jumps over the lazy dog")
0x 730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525
SHA224("The quick brown fox jumps over the lazy dog.")
0x 619cba8e8e05826e9b8c519c0a5c68f4fb653e8a3d8aa04bb2c8cd4c
</syntaxhighlight>


== Examples ==
Feel free to use this resource to see how SHA256 hashes change with just one space or character:


Please include some example of how your concept is actually used. Your example must include WHERE it is used, and WHAT IS BENEFIT of it being used.
https://emn178.github.io/online-tools/sha256.html
 
== Pictures, diagrams ==
 
Pictures and diagrams go a LONG way to helping someone understand a topic. Especially if your topic is a little abstract or complex. Using a picture or diagram is a two part process:
 
# [https://www.mediawiki.org/wiki/Help:Managing_files upload a file]
# [https://www.mediawiki.org/wiki/Help:Images use the file on a wiki page]
 
== External links ==
 
* It would be helpful
* to include many links
* to other internet resources
* to help fellow students
* Please make sure the content is good
* and don't link to a google search results, please


== References ==
== References ==
<references />
<references />


[[Category:2020 case study]]
[[Category:programming]]
[[Category:Student created article]]

Latest revision as of 17:41, 8 March 2020

Advanced programming[1]

SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001.[2]. It would be really helpful if you understood hashing and cryptographic hashing to appreciate this topic.


SHA256 is complex. Watch this video for an appreciation:


Even a small change in the message will (with overwhelming probability) result in a mostly different hash, due to the avalanche effect. For example, adding a period to the end of the following sentence changes almost half (111 out of 224) of the bits in the hash: 

SHA224("The quick brown fox jumps over the lazy dog")
0x 730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525
SHA224("The quick brown fox jumps over the lazy dog.")
0x 619cba8e8e05826e9b8c519c0a5c68f4fb653e8a3d8aa04bb2c8cd4c

Feel free to use this resource to see how SHA256 hashes change with just one space or character:

https://emn178.github.io/online-tools/sha256.html

References

  1. ↑ http://www.flaticon.com/
  2. ↑ https://en.wikipedia.org/wiki/SHA-2
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