What is the Cisco-recommended key length in bits for a Cisco Expressway certificate?
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The Cisco Expressway is a key component in Cisco's collaboration solutions, and it provides secure access for remote workers and business partners to collaborate with on-premises resources. In order to provide secure communications, the Expressway must use SSL/TLS certificates.
The Cisco-recommended key length in bits for a Cisco Expressway certificate is 2048 bits. This key length provides a good balance between security and performance. Keys that are too short can be easily cracked by attackers, while keys that are too long can cause performance issues.
When a user connects to the Expressway, the SSL/TLS handshake takes place, and the public key from the Expressway's certificate is exchanged with the client. The longer the key, the stronger the encryption, but this can also impact the performance of the handshake process.
It's worth noting that Cisco also recommends using a certificate signed by a trusted certificate authority (CA), rather than a self-signed certificate. This ensures that the certificate can be trusted by clients connecting to the Expressway, and it reduces the risk of man-in-the-middle attacks.