... stream. An example of this attack method in Perl is A NOTE ON WORKSTATIONS Typically masquerading as jokes, software downloads, and friendly email attachments, remote access backdoors leave ... (i.e., a system). More generally, a backdoor refers to a flaw in a particular security system. Therefore, hackers often want to preserve access to systems that they have penetrated even in the face ... obstacles such as new firewalls, filters, proxies, and patched vulnerabilities. Backdoor kits branch into two distinct categories: active and passive. Active backdoors can be used by a hacker...