Collaborate Disseminate
Lets suppose we have two devices A and B that want to connect over BLE using OOB pairing with QR codes.
I am asking myself whether the transmitted DH keys are static. At least the information provided by the QR code from device B to device… Continue reading Bluetooth keys for QR code pairing
TLS 1.3 removes the use of non-ephemeral Diffie-Hellman, which is great! But it still allows PSK.
I’m not as familiar with PSK configuration but wouldn’t that mean TLS 1.3 still is allowing the use of some form of non-ephemeral?
Or is ther… Continue reading I don’t understand TLS 1.3 allowing PSK
This is a follow on from this question:
"Diffie-Hellman Key Exchange" in plain English
In the answer to that question, the standard Diffie Hellman key exchange equation is derived:
(g^a mod p)^b mod p = g^ab mod p
(g^b mod p)^a m… Continue reading How does the inclusion of a subprime q value affect the Diffie Hellman equation for key exchange? [duplicate]
I’m thinking about the way to build encryption mechanism for ‘peer-2-peer’ communication. This is a mechanism I had a thought of:
Alice wants to communicate with Bob
First of all, Alice and Bob must know and trust the existence of the same… Continue reading Is this scenario of static ECDH public key exchange right?
I have generated a public and private key pair with ECDH from NodeJS
function _genPrivateKey(curveName = "secp384r1", encoding = "hex") {
const private_0 = crypto.createECDH(curveName);
private_0.generateKeys();… Continue reading ECDH for P-521 (Web Crypto Api) / secp521r1 (NodeJS Crypto) generate a slightly different shared secret
I have two systems, one running a C environment on a RTOS and another a python program running on a Pi.
I need to generate an encryption key using ECDH between these two systems for symmetric encryption.
On the C Side, I am using https://g… Continue reading Key generation between Tiny-C-ECDH and cryptography.hazmat.primitives.asymmetric.ec
Background information:
I am not a computer scientist. However, in a research project I am currently building a ESP32-based sensor. Multiple sensors of this type are going to be used by multiple users.
Every time a user wants to utilize a … Continue reading ESP32: Secure WiFi credentials via WebCrypto?
Background information:
I am not a computer scientist. However, in a research project I am currently building a ESP32-based sensor. Multiple sensors of this type are going to be used by multiple users.
Every time a user wants to utilize a … Continue reading ESP32: Secure WiFi credentials via WebCrypto?
In general, I understand the principle of Diffie-Hellman key exchange. What I don’t understand is what is so fundamental about primitive roots modulo p that guarantees that the shared secret is the same. I’ll use the notation similar from … Continue reading In Diffie-Hellman, why is the shared secret guaranteed to be the same? [duplicate]
I’m given 2 prime numbers, g and n, as well 2 public keys, ga mod n and gb mod n, as part of a leaked Diffie hellman key exchange. I need to derive the shared key gab mod n using the given information. I understand that I have to find a an… Continue reading Cracking diffie-hellman public key to obtain shared key