Abstract: According to one embodiment, a web application layer attack detector (AD) is coupled between an HTTP client and a web application server. Responsive to receipt of a set of packets from the HTTP client carrying a web application layer message that violates a condition of a security rule, the AD transmits an alert package to an automatic attribute value generation and rule feedback module (AVGRFM). The AVGRFM uses the alert package, and optionally other alert packages from the same AD or other ADs, to automatically generate a new set of attribute values for each of a set of attribute identifiers for use, by the AD or other ADs, in a different security rule than the violated security rule. The new set of attribute values may be used in an attack specific rule to detect a previously unknown web application layer attack.

Abstract: According to one embodiment, a computing device is coupled to a set of web application layer attack detectors (ADs), which are coupled between HTTP clients and web application servers. The computing device automatically learns a new condition shared by a plurality of alert packages reported by the set of ADs due to a triggering of one or more rules that is indicative of a web application layer attack. The computing device automatically generates a new set of attribute values by analyzing the plurality of alert packages to identify the condition shared by the plurality of alert packages, and transmits the new set of attribute values for delivery to the set of ADs for a different rule to be used to protect against the web application layer attack from the HTTP clients or any other HTTP client.

Abstract: According to one embodiment, a computing device is coupled to a set of web application layer attack detectors (AD), which are coupled between HTTP clients and web application servers. The computing device learns a new set of attribute values for a set of attribute identifiers for each of a sequence of rules through an iterative process having a plurality of iterations. The iterative process begins with an attack specific rule, and the sequence of rules includes an attacker specific rule and another attack specific rule. Each iteration includes receiving a current alert package from one of the ADs sent responsive to a set of packets carrying a web application layer request meeting a condition of a current rule used by the AD, automatically generating a new set of attribute values based upon the current alert package, and transmitting the new set of attribute values to the set of ADs.

Abstract: A method includes: generating object information that indicates an object designated from among a header item, text, and attached information of a received email, or feature amount information based on the object information and a predetermined function, when a source is an address in an internal network, decrypting verification information added to the received email using secret key information shared in the internal network, when the source is an address over an external network, decrypting the verification information using public key information shared with the source, and verifying whether or not the received email is a spoofed mail based on the object information or the feature amount information, and the decrypted verification information.