Abstract: A method includes receiving a set of strings and applying one or more filters to generate a subset of strings that are determined to correspond to strings of interest. The method also includes retrieving domain name system (DNS) information associated with a first string of the subset. The method includes executing a rule-based engine to determine, based on application of one or more rules to the DNS information, whether to add the first string to a set of suspicious hostnames.

Abstract: A system (50, 150) for assisting a user (14) to determine whether an email (18) comes from a purported originator (16). A computerized system having a display unit is provided. Logic (54) in the computerized system determines whether the email (18) includes an authenticity mark (52) including an originator identifier (102) and encrypted data (104). Logic (54) in the computerized system then decrypts the encrypted data (104) into decrypted data (108-14), based on the originator identifier (102). Logic (54) in the computerized system then presents to the user (14), on the display, whether the email (18) includes the authenticity mark (52), whether the encrypted data (104) decrypts successfully, and information based on the authenticity mark (52) and the decrypted data (108-14).