1. Cryptography – Private key and Public key
Knowchain is using cryptography based on Elliptic Curve Cryptography. The choice of the
underlying curve is important to guarantee the security and speed. Knowchain has chosen to
use Edwards-curve Digital Signature Algorithm (EdDSA). It was developed by Daniel J. Bernstein,
Niels Duif, Tanja Lange, Peter Schwabe, and Bo-Yin Yang and is one of the safest and
fastest digital signature algorithms.
We use the EdDSA signature scheme using SHA-512/256 and Curve25519 called Ed25519
where the twisted Edwards curve is -x^2+y^2=1-121665/121666 x^2 y^2 and the finite field
defined by the prime number q=2^255-19, SHA-512 with b = 256
Private key is a 256-bit string k which should be chosen uniformly at random. The public key is
derived from Private key following the steps:
![1.PNG](https://cdn.steemitimages.com/DQmQLK2Cv84MTQBiB5wNVH9aYtcRn8U39dScMuq7dn5RFGh/1.PNG)

2. Second pass Phrase
Knowchain adds an additional layer of security by allowing users to create a second pass
phrase that is associated with the private key. This feature requires that all transactions that
come from those users need to be signed using the second pass phrase in order to be valid.
The process of generating the second pass phrase is the same as the process for the main key
pair (private key and public key).
![2.PNG](https://cdn.steemitimages.com/DQmWnofNqsBJ4KMJ7VRZhR6fdfK7HpTbpBZaFVZQzouNf5m/2.PNG)

3. Multi-signature
Knowchain supports multi-signature accounts. A multi-signature account is an account that
requires multiple signatures to sign for transactions. Users can enable multi-signature on their
account by specifying a group of signers. After that any transactions which are created from
this account must be signed by all associated accounts before being processed.

for the more imformation :
homepage : https://knownetwork.io/
telegram : https://t.me/KnowGlobalCommunity
whitelist : https://knownetwork.io/Knowchain_Whitepaper_V2.0.pdf