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Is ECDHE more secure than RSA?
ECDHE with ECDSA is about the same as RSA in performance, but much more secure. ECDHE with RSA is slower, but still much more secure than RSA. if you’re concerned about performance, use an ECDSA certificate. don’t use RSA key exchange.
What is ECDHE used for?
ECDHE means that the client and server will agree on encryption keys using Ephemeral Elliptic Curve Diffie-Hellman. RSA means that the client will verify that the key is valid using the RSA algorithm to communications.
What is DHE cipher?
The Diffie–Hellman key exchange method allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure channel. This key can then be used to encrypt subsequent communications using a symmetric-key cipher.
How is the RSA key used in ECDHE-RSA?
Short answer: in ECDHE-RSA, the RSA public key in the certificate is used to verify the RSA signature on the ephemeral ECDH public parameters that the server sends. All Diffie-Hellman key exchanges are anonymous by default, meaning you have no information who you’re exchanging keys with.
What’s the difference between TLS ECDHE and TLS-RSA?
I compare the pcap between TLS-RSA and TLS-ECDHE-RSA, finding that: In the certificate presented by the server, both contain an RSA public key (subject public key) and the certificate has an RSA signature (Sha256withRSAencryption) In the “server key exchange” packet for TLS-ECDHE-RSA, there is a DH key with RSA signature.
What’s the difference between a DH certificate and a RSA signature?
The RSA signature for the “dh key” and “certificate” is used for authentication purposes / digital signature for the server to prove it is who it claims to be. “RSA public key” in the certificate, for TLS-RSA, is used by the client to encrypt the PMS.
What does the key exchange ( Kx ) mean in ECDH?
That means the key exchange (Kx) is ECDH, but the authentication part (Au, i.e. the validation of the certificate) is RSA, so it expects a certificate with a RSA key inside.