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Is it possible to generate the original text from hash value?
So, no, you can not recreate the original data from it’s hash. The only thing a hash is good for is to compare it with other hashes to see if the hashed data is identical or not.
Can a hash be reversed?
Hashing is a mathematical operation that is easy to perform, but extremely difficult to reverse. (The difference between hashing and encryption is that encryption can be reversed, or decrypted, using a specific key.)
How hard is it to reverse SHA256?
Its impossible for you to reverse the hash, to get that 100mb of data back out of the fixed size hash, the best you can do, is try to guess / compute the seed data, hash, and then see if the hash matches the hash your trying to break.
Can you get original value from hash value?
No. That’s usually the point — the process of hashing is normally one-way. This is especially important for hashes designed for passwords or cryptology — which differ from hashes designed, for say, hash-maps. Also, with an unbounded input length, there is an infinite amount of values which result in the same hash.
Is it possible to hash a byte string?
The best you can do is to try hashing a given number of possible byte-combinations (eg, the contents of the file) until you find an output that matches your original hash. For a short byte-string, this attack is viable (this is why simply hashing a password and storing it in a database is not considered secure).
Is it possible to compare two strings by their ” hash ” numbers?
Integer savedHash = 352736; String newText = “this is new string”; if (Math.abs (hash (newText) – savedHash) < 100) { // wow, they are very close! } Are there any algorithms for this purpose? ps. The length of the text is not fixed. pps. I know how usual hash codes work.
Is it possible to extract data from a hash?
To give you a real-world perspective on hashing data and your question about “extracting” the original data from a hash: expecting someone to be able to reproduce the original data from a hash, would be like asking someone to create a nice dinner for all of us while only having a receipt available.