Collaborate Disseminate
I’m looking to build my own digital signature operations into a program I’m writing, and the nuances of cryptography are a bit beyond me.
According to this website the NIST/NSA algorithms (P-224, P-256, P-384) are not “Safe”… Continue reading How can I use ‘safe’ Elliptic Curve algorithms in .Net Core?
I’m trying to refactor some client-side code from BouncyCastle to Microsoft Cng. I’ve figured out how to convert key format(ECC key blobs) between them, but I couldn’t calculate the same secret.
Currently, the client uses Or… Continue reading BouncyCastle and Microsoft Cng ECDH secret key mismatch
I wonder if I provide someone with two public keys from different elliptic curves, is there any way to prove that these two public keys are generated from the same private key without revealing the private key itself?
If ECDH-RSA is used for key exchange, this is what happens:
The server has its public ECDH parameter embedded within its certificate. The client generates its public ECDH parameter, extracts the server’s public ECDH paramete… Continue reading Advantage Of ECDH-RSA over RSA Ciphersuites In TLS
Manual page for OpenSSL ec command states:
The PEM private key format uses the header and footer lines:
—–BEGIN EC PRIVATE KEY—–
—–END EC PRIVATE KEY—–
The PEM public key format uses the header and footer lines… Continue reading Why PEM encodings of EC public and private keys use different headers?
I’ve seen various references on the web for generating Elliptic Curve KeyPairs in Java, and the two most commonly referenced examples (unsurprisingly) use the JDK default provider and BouncyCastle.
But what confuses me is th… Continue reading Is the JDK standard EC KeyPairGenerator suitable for use with both ECDSA and ECDH algorithms?
I have protocol required for privacy. Thus, I want to use hybrid cryptography. Base on my knowledge, ECDH is fast and secure.
My system consists of 3 main components a trusted-server, client, and server
1- The server will ge… Continue reading Can be used ECDH with static public key and parameters?
I’m using mbed TLS for ECDH key agreement using Curve25519. The private and public keys are stored and transmitted as Hex strings as easily generated with mbed TLS. Those strings are big-endian. This worked quite fine so far…. Continue reading ASN.1 encoding of X25519 private key
I have an existing system that signs an arbitrary binary blob with an ECDSA key. The output of this is an r and s value. I now need to verify this signature on another system. On this other system though we are using BouncyCa… Continue reading How do I convert an elliptic key signature r and s value into a signature byte array?
I recently had a problem where I created an EC client certificate which used the sect571k1 curve and I got some strange errors attempting to use it as a client certificate through Mozilla Firefox. It turns out that Firefox supports secp521… Continue reading Where can I find a canonical list of elliptic curve names and their aliases?