Thank You Very Much...for all valuable explanation specially diagram of Hash Function...Since long days pending doubts got cleared....Such a beautiful clear explanation..Great Job Done!!!!!!!
thank you so much for the clear examples, it really helped me understand what it is and what is going on in HashCode, I have one question though, so in your last example about the photo being altered, how are you able to verify that the photos' fingerprint is not the same one on the altered photo? Do you only have to have one fingerprint to verify an object? What if that fingerprint got destroyed? and where is the fingerprint of the object stored?
Each object only has one fingerprint. You have to have access to the digital object to calculate the fingerprint. Then you have to store it somewhere if you want to make sure that a future copy of the object is the same.
A hashcode is a general concept. It is a way of taking a digital file and reducing it to a code (the hashcode) that is much shorter. The code is almost unique to the file, so you can use a much shorter hashcode to represent the larger file. It is just a fingerprint of the larger file: it doesn't contain all the information. This is a useful technique in technology design generally, but is used in the bitcoin blockchain specifically. If you go online to this website (www.md5hashgenerator.com/), you can enter whatever text you like and then get the hashcode for that text. There are different ways to make a hashcode. The website referenced using the md5 algorithm. The hashcode for this paragraph up to and including the following colon is: c093a438a8094d80039ae37a19735f22
I have a doubt, if you copy a photograph and place it another folder it will have a different hash code because it was created at a different time, am I wrong? Please Tell Me!
No, the content of the photograph doesn't contain the time it was created. That is meta-data associated with the file. It is like a text-file that contains only text. If you copy it, the new file will still only have the same text content, but the date on the new file will be changed. The meta-data doesn't get hashed
10:21 "the hash code have been compromise but the password is not been compromised !" . looool . this is true ... but with the hash code , the bad guy will have access to that computer , because the hash code IS IN FACT A PASSWORD THAT CAN BE USED TO GAIN ACCESS TO THAT COMPUTER !!!
I don't quite understand how a hashcode is the same as the password. The user presents a password and the system calculates the hashcode before attempting to match it. If your system is written correctly then the only place a hashcode can be obtained from a user is from a password.
+Sharif Robin Sharif, I wish I had the capacity to interact with everyone, but unfortunately I can't work one-on-one with folks unless they end up in one of my classes.
5:12
djp3:
"A hash code is a fingerprint for digital data."
Very good video. once explained, you shouldn't have used the word fingerprint at all.
This channel is pure gold, I feel like I just discovered the Rosetta Stone thankyou
Thank You Very Much...for all valuable explanation specially diagram of Hash Function...Since long days pending doubts got cleared....Such a beautiful clear explanation..Great Job Done!!!!!!!
Base of NFT'S.
Thanks for posting this up. Really useful!
Why is this topic so hard to find good education on?
Because there aren't any cats doing funny things involved in hash codes?
thank you so much for the clear examples, it really helped me understand what it is and what is going on in HashCode, I have one question though, so in your last example about the photo being altered, how are you able to verify that the photos' fingerprint is not the same one on the altered photo? Do you only have to have one fingerprint to verify an object? What if that fingerprint got destroyed? and where is the fingerprint of the object stored?
Each object only has one fingerprint. You have to have access to the digital object to calculate the fingerprint. Then you have to store it somewhere if you want to make sure that a future copy of the object is the same.
Excellent explanation ..
Was the title question ever really answered? Was there a definition of Hashcode?
A hashcode is a general concept. It is a way of taking a digital file and reducing it to a code (the hashcode) that is much shorter. The code is almost unique to the file, so you can use a much shorter hashcode to represent the larger file. It is just a fingerprint of the larger file: it doesn't contain all the information. This is a useful technique in technology design generally, but is used in the bitcoin blockchain specifically. If you go online to this website (www.md5hashgenerator.com/), you can enter whatever text you like and then get the hashcode for that text. There are different ways to make a hashcode. The website referenced using the md5 algorithm. The hashcode for this paragraph up to and including the following colon is:
c093a438a8094d80039ae37a19735f22
Thank You
I'm scare the sound everytime you write on the board.
hahaha! sorry!
You're an excellent teacher. Great explanation, thank you very much.
I have a doubt, if you copy a photograph and place it another folder it will have a different hash code because it was created at a different time, am I wrong? Please Tell Me!
No, the content of the photograph doesn't contain the time it was created. That is meta-data associated with the file. It is like a text-file that contains only text. If you copy it, the new file will still only have the same text content, but the date on the new file will be changed. The meta-data doesn't get hashed
djp3 thank you for a detailed answer
Sir, what dose bitcoin mining pools do with hash codes?
In order to close a block of transactions a hash code must be found which has the right number of zeroes in it.
Explained well, Thanks
thanks!
10:21 "the hash code have been compromise but the password is not been compromised !" . looool . this is true ... but with the hash code , the bad guy will have access to that computer , because the hash code IS IN FACT A PASSWORD THAT CAN BE USED TO GAIN ACCESS TO THAT COMPUTER !!!
I don't quite understand how a hashcode is the same as the password. The user presents a password and the system calculates the hashcode before attempting to match it. If your system is written correctly then the only place a hashcode can be obtained from a user is from a password.
Hi, is that a hash collision? I am not well versed with the topic, so your answer would help me a lot.
can any1 give me hash code from 1 to 100??
+sankush phatarpekar ? that doesn't make sense.
What school do u work in ???
+Sharif Robin I currently have an appointment at the University of California, Irvine and also at Westmont College in Santa Barbara.
+Sharif Robin yes
can you give me a call on skype at sharif.shafin2 i would like to ask you a few questions
+Sharif Robin Sharif, I wish I had the capacity to interact with everyone, but unfortunately I can't work one-on-one with folks unless they end up in one of my classes.
Skip to 5:12 and don't waste your time. Thank me later.
It's true or www.techopedia.com/definition/25432/hash-code
kk