Collaborate Disseminate
Is it possible to generate a file with a given sha256sum checksum?
That is, reverse the process of a sha256sum checksum. That is, if we have a checksum, can we generate txt file data (need not be original) whose its checksum is equal to th… Continue reading Is it possible to generate a file with a given sha256sum checksum?
I was burning an iso file into the sd card with pi imager and I doubled checked the hash before the burning and after and I got different results
sha256sum kali-linux-2022.4-raspberry-pi-arm64.img.xz
fba37da4901558479de64fd886937e3d4653e9a… Continue reading The hash of kali-linux-2022.4-raspberry-pi-arm64.img.xz changed after burning it into an sd card
I have just begun my bachelor’s in IT security and we have been presented with a list of exercises. I have completed all, but one of them. (Note: this is to be done in Python).
In this exercise we are given a SHA256 hash, which is a user’s… Continue reading Need help cracking a SHA256 hash, based on a list of hint strings [closed]
https://sha256.web-max.ca/index.php#enter
This Website can reverse sha256.
So how is it that it is supposedly a "irreversible one-way function"?
Is there anything wrong with hashing(with SHA256) the shared secret generated by ECDH that is 384 bits long and using that as the AES key? Is there a difference between that and, say, truncating the 384 bits down to 256.
Edit:
And would th… Continue reading Generating AES 256 key from ECDH P-384
I’m working on a website that will require users to insert a valid email address, which will work as their unique user id. This email will not be used for communicating with the user, it is only ever used to verify that a particular user i… Continue reading Are SHA-256 hashes of user emails guaranteed to be unique?
I am taking a SHA256 hash output in hexadecimal (64 hex nibbles), subsequencing it by taking every other character to make it 32 hex nibbles or 128 bits, and formatting it into a UUID string.
This isn’t being used for security purposes, ma… Continue reading Collision probability between truncating vs subsequencing of SHA256 hash to 128 bits?
I am looking for a technical estimate of how bad the situation is regarding the recent hack of lastpass. The hack was covered by several outlets: Naked Security, Ars Technica.
Lastpass has admitted that a hack took place over its servers a… Continue reading What is the math behind iterations in PBKDF2-SHA256 for lastpass users?
This link suggests that MS Teams calls are encrypted and can be verified by reading out the 20-digit security codes found on the endpoint computers.
To protect against a man-in-the-middle attack between the caller and callee, Teams derives… Continue reading Microsoft Teams encryption verification
As we can see on this page, BLAKE-3 is about 14 times faster than SHA-256. Is it as safe as SHA-256? I would like to use it for my passwords which are 32 cryptographically random bytes, because my API uses application-layer encryption whic… Continue reading BLAKE-3 vs SHA-256 security