Collaborate Disseminate
When we want to send a message from A to B with confidentiality and non repudiation. I want answer and reasons for both the technique
1)
Why First Encrypt then sign is better ?
2)
Why First sign then Encrypt I’d better than 1)
From this question, it is said that when creating a CSR, we attach the public key and fill in other data.
When creating a CSR, you attach your public key to it and fill in other needed data; you then send it to a Certificate Authority (CA… Continue reading Is a Certificate Signing Request a concatenation of public key and metadata?
I came across a PGP public key that seems invalid. The key is a secp256k1 public key that supported by GPG. In fact, GPG allows importing that key even if it has an invalid secp256k1 public key inside.
Running –list-packets on the key sho… Continue reading GPG allows importing an invalid secp256k1 public key
When I run the command btc_address_dump "0x0000000000000000000000000000000000000000000000000000000000000001" the outputed public key is 0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1… Continue reading How to generate public key from private key in python3 with out importing any module [migrated]
I’ve been reading about WebAuthn and try to write some code to exercise.
One thing I noticed is that the spec doesn’t seem to provide any way to verify the correctness of the public-key being create()’d other than through attestation. And … Continue reading WebAuthn does not guarantee public-key integrity other than trough attestation?
If we talk about the security of public key encryption in Regev’s lwe system, if attacker would have knowledge of (u,u’)[u=Ar, u’=b^tr + ยต q/2, r={0,1}^m] and b, then value of r in u’ can be guessed easily by the knowledge of u and A and s… Continue reading Regev’s learning with error [migrated]
I would like to make a key/string/token encrypted string to send it to the user via email.
This encrypted KEY would have encrypted data (resource id) and would be stored in the database along with valid column. It is meant to be used only… Continue reading Is create a key to access resources than send it to client instead of login/password system , a good idea?
I know it’s possible with ECDSA. How bout RSA?
Continue reading Can we extract public key from signature created by RSA? [migrated]
Lets say Bob wishes to communicate with Alice.
Alice’s public key is useless to Bob unless he can prove that the public key came from Alice. To do this, Bob and Alice can establish a secure channel to exchange Alice’s the public key, but t… Continue reading Does public key cryptography provide any security advantages, or even just a different security model, over symmetric cryptography?
This is my first project of this nature, and I am hoping this is a basic use case for PGP encryption. Please forgive my ignorance!
There is a server being configured by a service provider (SP). The SP is distributing files on their server…. Continue reading PGP key pair – How to set up for multiple users to decrypt messages with Kleopatra