Author

Topic: Reading about hashing - SHA (Read 598 times)

b!z
legendary
Activity: 1582
Merit: 1010
February 04, 2015, 03:54:11 PM
#4
Just went curious how it works and why it is practically impossible to decrypt.
Hashing != encryption.

http://www.youtube.com/watch?v=y3dqhixzGVo

But while reading it, i got the impression that multiple messages can have the same hash? though the probability must be very low. Is it possible?
Yes, of course. That's inevitable if message is longer than hash value.

lol, I just replaced the word with decrypt personally haven't heard of "dehashing" much, so I substituted another word with almost similar meaning. Intention was only to make someone who read understand.


If it gets repeated, isn't the chance of that happenning very slim? Is it possible to calculate another message, if the hash is given and the real message is known, that has the same hash without much difficulty?

Google "SHA-___ collision"
legendary
Activity: 1302
Merit: 1005
New Decentralized Nuclear Hobbit
February 04, 2015, 07:23:52 AM
#3
Just went curious how it works and why it is practically impossible to decrypt.
Hashing != encryption.

http://www.youtube.com/watch?v=y3dqhixzGVo

But while reading it, i got the impression that multiple messages can have the same hash? though the probability must be very low. Is it possible?
Yes, of course. That's inevitable if message is longer than hash value.

lol, I just replaced the word with decrypt personally haven't heard of "dehashing" much, so I substituted another word with almost similar meaning. Intention was only to make someone who read understand.


If it gets repeated, isn't the chance of that happenning very slim? Is it possible to calculate another message, if the hash is given and the real message is known, that has the same hash without much difficulty?
legendary
Activity: 3108
Merit: 1359
February 04, 2015, 07:11:35 AM
#2
Just went curious how it works and why it is practically impossible to decrypt.
Hashing != encryption.

http://www.youtube.com/watch?v=y3dqhixzGVo

But while reading it, i got the impression that multiple messages can have the same hash? though the probability must be very low. Is it possible?
Yes, of course. That's inevitable if message is longer than hash value.
legendary
Activity: 1302
Merit: 1005
New Decentralized Nuclear Hobbit
February 04, 2015, 06:53:14 AM
#1
I was reading about this. Just went curious how it works and why it is practically impossible to decrypt.

But while reading it, i got the impression that multiple messages can have the same hash? though the probability must be very low. Is it possible?
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