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Outlook: New Problems offer new Challenges Internet offers agent many identities user, ip, mac, tcp port, ... What is “A”, “ID_A”? Many types of DoS attacks flooding, bombing, starving, disrupting New types of properties fairness, abuse-freeness, timeliness, effectiveness DoS key control, perfect forward secrecy, ... layered properties if attacker ... then ..., if attacker ... then ... Not only Communication Channels Viruses, Trojan Horses, APIs Trust Problem (e.g. TCP) |