Can 2 different files have the same hash?

Generally, two files can have the same md5 hash only if their contents are exactly the same. Even a single bit of variation will generate a completely different hash value. There is one caveat, though: An md5 sum is 128 bits (16 bytes).

Is hash always the same?

Hashing is simply passing some data through a formula that produces a result, called a hash. That hash is usually a string of characters and the hashes generated by a formula are always the same length, regardless of how much data you feed into it.

Can 2 files have same sha256?

We use SHA-256 because this 256-bit key is much more secure than other common hashing algorithms. Collisions are incredibly unlikely: There are 2256 possible hash values when using SHA-256, which makes it nearly impossible for two different documents to coincidentally have the exact same hash value.

How do you compare hash values?

Compare two hash values

1. Just below the creation of a hexadecimal string, create a new hash value based on new source data.
2. The most straightforward way to compare two arrays of bytes is to loop through the arrays, comparing each individual element to its counterpart from the second value.

How do I make two files with md5 hash?

1 Answer

1. Compress the files and generate the md5 hash from that file.
2. Generate multiple md5 hashes and join them using an algorithm that always ensures the same value is produced from the hashes each time. For example concatenate the hashes or create an md5 hash of all the md5 hashes.

Does hash always return same value?

Yes, if you hash the same input with the same function, you will always get the same result. This follows from the fact that it is a hash-function. By definition a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output.

Can two strings have same SHA256 hash?

As far as I can see, there aren’t any known (or at least public) sha256 collisions. Obviously passing the same string twice will satisfy it.

What is it called when two hashes are the same?

*security: The probability of two files having the same hash is called collision and can be very bad for our purposes, so it should be as near to zero as possible. Usually, for secure hashing, you need a much more computationally expensive algorithm.

Is it possible to have two files with the same hash?

It is easier to find two files with the same hash than to generate one to match a given hash, and easier to do the later if you don’t have to respect form/content/lengths restrictions. Thus, if it is possible to use a well defined document structure and lengths, you can make an attackers life a bit harder no matter what underling hash you use.

Why would you want to hash a file?

Without opening two document files to compare them word-for-word, the calculated hash values of these files will allow the owner to know immediately if they are different. Hashing is also used to verify the integrity of a file after it has been transferred from one place to another, typically in a file backup program like SyncBack.

What is a hash value and why is it used?

Hashing is also used to verify the integrity of a file after it has been transferred from one place to another, typically in a file backup program like SyncBack. To ensure the transferred file is not corrupted, a user can compare the hash value of both files. If they are the same, then the transferred file is an identical copy.

What is hashing and how do you do it?

One method you could use is called hashing, which is essentially a process that translates information about the file into a code. Two hash values (of the original file and its copy) can be compared to ensure the files are equal. What is Hashing?