Last Updated on November 21, 2023 by InfraExam
Why is using ECDHE_ECDSA stronger than using RSA?
- ECDHE_ECDSA provides both data authenticity and confidentiality.
- ECDHE_ECDSA uses a much larger key size.
- ECDHE_ECDSA uses a pseudorandom function to generate the keying materials.
- If the server’s private key is later compromised, all the prior TLS handshakes that are done using the cipher suite cannot be compromised.
|Explanation & Hint:
The primary reason why using ECDHE (Elliptic Curve Diffie-Hellman Ephemeral) with ECDSA (Elliptic Curve Digital Signature Algorithm) is considered stronger than using RSA, particularly in the context of TLS (Transport Layer Security), is:
This is due to the property known as “forward secrecy” provided by ECDHE. With ECDHE, each session has its own unique set of keys, which are not derived from the server’s long-term private key. Therefore, even if the server’s private key is compromised at a later date, previous encrypted communications remain secure because the session keys cannot be retroactively calculated.
The other options provided are not accurate because: