hashing | Simple utility to calculate and compare hashes | Hashing library

We have setup Redis with sentinel high availability using 3 nodes. Suppose fist node is master, when we reboot first node, failover happens and second node becomes master, until this point every thing is OK. But when fist node comes back it cannot sync with master and we saw that in its config no "masterauth" is set.
Here is the error log and Generated by CONFIG REWRITE config:

I want to generate a password salt with os.urandom(). And then create a hash with:

I have this code in Java that generates a SHA256 hash:

Hashing.sha256().hashString(value,Charsets.UTF_16LE).toString()

I'm trying to do the same on JavaScript/Node, that having the same value returns the same result.

I tried usind crypto-js but without success (it returns a hash string but different from the one generated with the Java code).

I tried this, for example:

It is not very clear to me how the standard std::unordered_map container uses hashing.

I am pretty new to hashing, and right now I'm trying to pass my university data structure exams.

I understand that if I have a collection of objects, I have to group their keys as random as possible by a criteria so that they lie as uniformly as possible in some buckets, and I can afterwards search/insert/delete in constant time by looking into the bucket associated with the hashed key (this is mainly what hashing with chaining does, correct me if I am wrong).

But, how does std::unordered_map use hashing? How does it set a new (key, value) pair using hashing? I mean, I know that hashing will group the keys by some criteria, but it is not clear at all how it sets a new (key, value) pair using hashing.

I'm attempting to get the hashes of the file which is the argument supplied. Here is my current code:

I am looking at migrating the hashing algorithm used for all passwords in a database and looking for proof of concept.

I was reading up on a concept that would be very user friendly and not force anyone to change their password here that essentially allows to migrate all passwords in the database at once by hashing the hash:

The idea is basically to hash the hash. Rather than waiting for users provide their existing password (p) upon next login, you immediately use the new hashing algorithm (H2) on the existing hash already produced by the old algorithm (H1):

hash = H2(hash) # where hash was previously equal to H1(p)

After doing that conversion, you are still perfectly able to perform password verification; you just need to compute H2(H1(p')) instead of the previous H1(p') whenever user tries to log in with password p'.

So essentially I would:

1. Using the new algorithm, re-hash all of the passwords currently stored in the database with the old hash algorithm.
2. When users try to authenticate, wrap the old algorithm with the new one to verify the password.

Let's say I am migrating from SHA1 to BCRYPT, I run the following test with a password of 11111111:

I'm using ThreeJS in Angular. Last week I compiled my code and upload the latest version of app to server then I faced the errors below on Mac and iPhone.

Context Currently I am hashing values in Postgresql database using a salt. I am trying to migrate the same functionality from Postgres to Snowflake.

What I have tried to do

Currently data is being hashed in Postgres like:

My question relates to the minting process to create an NTF.

I might be wrong but the tokenization function can be compared to an hashing function which takes as input the media and outputs the token.

Yeah this actually already is a question, cause otherwise the main question maybe does not makes sense.

Assuming the comparison to an hash function makes sense and forgetting about collisions let's assume the following scenario: I create a digital artwork and the related NFT. It's published and sells somehow (hopefully :D).

Imagine Mr.XYZW is a well known digital artist who gets huge revenues from NFT, he sees my artwork, somehow he likes it but also thinks the artwork would look better if for example the colors simply get inverted. Here I'm just mentioning one of all the possible changes he could do, the point is that easily those changes could not even be noticeable to the human eye, but not to the tokenizer, which would in the end clearly create a different token.

Now the problem should be clear.

If what I said makes sense, how is it usually tackled? in case it doesn’t, please help me to understand.

Thank you