Collaborate Disseminate
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
I need to hash 32 cryptographically random bytes, but later the verification the value with hash must be very fast, so I decided to use SHA256. Is it a security issue if my passwords are 32 cryptographically random bytes? Maybe you know so… Continue reading SHA256 for hashing 32 cryptographicaly random bytes
Ofrece servicios de emisión de certificados para firma electrónica, es una obligación para pago de impuestos.
El usuario común no conoce la tecnología detrás, pero percibe la velocidad de respuesta.
Entonces, cómo elegir el tamaño adecuado… Continue reading Qué longitud de certificado es más seguro y fácil de manejar, 2048, 3072 ó 4096 para usuarios no expertos?
I am working on a project where I want to calculate the first two characters of HSH 256 through Excel using known MD5 as per attached file.
I am setting up a postgres db that will never be used by humans. In fact, I really don’t need to know it myself ever. I assumed that just using a 256bit(64 alphanumeric chars) hash of a unix timestamp IE:
date +%s%3N | sha256sum
A very im… Continue reading Is a sha256 hash of a unix timestamp a strong password
I have seen that for RSA2K the hash function SHA-256 has been used.
Now my question is if I want to use RSA3K, should I change the size of the hash function for example from SHA-256 to SHA-384? Is there a relationship that one needs to con… Continue reading Is there a relationship between the size of RSA key and size of hash function?