Abstract: A method for characterizing application layer denial-of-service (DDoS) attacks comprises generating a plurality of dynamic applicative signatures by analyzing at the application layer application layer requests received during an on-going DDoS attack, a dynamic applicative signature characterizing each received request based on frequent application layer attributes appearing in the received requests, wherein the requests are represented as a set of paraphrases, each paraphrase representing a specific aspect of a request's structure, the frequent application layer attributes being determined based on frequency of paraphrases in the set; characterizing each of the received requests based on one of the dynamic applicative signatures, the characterization providing an indication for each request whether a request is generated by an attack tool executing the on-going DDoS attack; and causing a mitigation action on the received request generated by the attack tool based on the generated dynamic applicative signatur

Abstract: A method and system for generating dynamic applicative signatures of by application layer flood attack tools are provided. The method includes determining a plurality of different attributes of requests received during an on-going DDoS attack; clustering at least one attribute of the plurality of different attributes, wherein the clustering is based on values of the plurality of different attributes; determining clusters of attributes representing most frequent structures of the requests received during the on-going DDoS attack; and generating, based on the determined clusters of attributes, signature of an application layer flood attack tool executing the on-going DDoS attack.

Abstract: A method and system for characterizing application layer denial-of-service (DDoS) attacks are provided. The method includes generating a dynamic applicative signature by analyzing requests received during an on-going DDoS attack, wherein the dynamic applicative signature characterizes based on frequent applicative attributes appeared from the received; characterizing each incoming request based on the generated dynamic applicative signature, wherein the characterization provides an indication for each incoming request whether an incoming request is generated by an attack tool executing the on-going DDoS attributes; and causing a mitigation action on the incoming request generated by the attack tool based on the generated dynamic applicative signature.

Abstract: A method and system for generating dynamic applicative signatures of by application layer flood attack tools are provided. The method includes determining a plurality of different attributes of requests received during an on-going DDoS attack; clustering at least one attribute of the plurality of different attributes, wherein the clustering is based on values of the plurality of different attributes; determining clusters of attributes representing most frequent structures of the requests received during the on-going DDoS attack; and generating, based on the determined clusters of attributes, signature of an application layer flood attack tool executing the on-going DDoS attack.

Abstract: A method and system for characterizing application layer denial-of-service (DDoS) attacks are provided. The method includes generating a dynamic applicative signature by analyzing requests received during an on-going DDoS attack, wherein the dynamic applicative signature characterizes based on frequent applicative attributes appeared from the received; characterizing each incoming request based on the generated dynamic applicative signature, wherein the characterization provides an indication for each incoming request whether an incoming request is generated by an attack tool executing the on-going DDoS attributes; and causing a mitigation action on the incoming request generated by the attack tool based on the generated dynamic applicative signature.

Abstract: A method and system for characterizing application layer flood denial-of-service (DDoS) attacks are provided. The method includes receiving an indication on an on-going DDoS attack directed to a protected entity; generating a dynamic applicative signature by analyzing requests received during the on-going DDoS attack, wherein the dynamic applicative signature characterizes requests generated by an attack tool executing the on-going DDoS attack; and characterizing each incoming request based on the generated dynamic applicative signature, wherein the characterization provides an indication for each incoming request whether a request is generated by the attack tool.

Abstract: A method and system for characterizing application layer flood denial-of-service (DDoS) attacks carried by advanced application layer flood attack tools. The method comprises receiving an indication on an on-going DDoS attack directed toward a protected entity; analyzing requests received during the on-going DDoS attack to determine a plurality of different attributes of the received requests; generating a dynamic applicative multi-paraphrase signature by clustering at least one value of the plurality of different attributes, wherein the multi-paraphrase signature characterizes requests with different attributes as generated by an advanced application layer flood attack tool executing the on-going DDoS attack; and characterizing each incoming request based on the multi-paraphrase signature, wherein the characterization provides an indication for each incoming request whether a request is generated by the attack tool.