Method and system for detecting and mitigating attacks performed using cryptographic protocols

A method for detecting and mitigating encrypted denial-of-service (DoS) attacks, comprising:

• detecting an encrypted DoS attack in an inbound traffic by analyzing network layer attributes of only the inbound traffic, the inbound traffic originates at a client and is addressed to a protected server and the network layer attributes are not encrypted;
• dropping a connection between the client and the protected server if an encrypted DoS attack at the network layer has been detected;
• terminating an encrypted connection with the client if an encrypted DoS attack at the network layer has not been detected;
• detecting an encrypted DoS attack in the inbound traffic by analyzing application layer attributes of only the inbound traffic, wherein the network layer attributes are encrypted;
• and
• causing to establish a new encrypted connection between the client and the protected server, if an encrypted DoS attack at the application layer has not been detected.

A method for detecting and mitigating encrypted denial-of-service (DoS) attacks, comprising:

• terminating an encrypted connection between the client and a protected server, upon reception of only an inbound traffic diverted from a client, wherein the inbound traffic is suspected to include malicious threats;
• establishing a new encrypted session with the client;
• responding to a client's request received over the new encrypted session with an encrypted client web challenge;
• determining if the client correctly responds to the encrypted client web challenge;
• dropping the new encrypted session with the client, if the client does not correctly respond to the encrypted client web challenge;
• and
• causing the client to establish a new encrypted session with the protected server, if the client does correctly respond to the encrypted client web challenge.