By Patrick M. Morgan
Newly revised within the mild of the renewed debate of the final 5 years, this moment version of Patrick Morgan's publication is a accomplished assessment of the common sense and the perform of deterrence. Morgan highlights the problems interested in speedy deterrence, using possibility to discourage in a particular, fast scenario. He then explores the irrationality of the strategic thoughts that basic nuclear deterrence deals. He exhibits how alterations in theories of the way judgements are made adjust perspectives of ways deterrence works -- and the way an opponent will reply to danger. eventually, he considers a manner of lowering our dependence on a coverage that will depend on the specter of nuclear guns. stories of the 1st variation: `This
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Additional resources for Deterrence: A Conceptual Analysis
In particular, most UBE-sending systems do not retry failed connections. As such, greylisting allows legitimate servers (with correctly configured retry cycles) to still send e-mail (albeit with a two-minute delay) while rejecting most UBE. However, it should be noted that very old e-mail clients (and servers) may consider a 451 error code as a permanent failure and not attempt further retries – effectively rendering the destination unreachable. Another problem with greylisting is that if the server retry 57 5: Server Side Security delay is set too long, users may perceive a delay in the normally instantaneous e-mail delivery.
Threats to confidentiality, integrity and availability are considered as well as a range of technical countermeasures to detect, prevent or minimise the impact of an attack. Specific attention is given to solutions to mitigate malware, spam and phishing. Although Chapter 3 introduced a number of countermeasures that can be deployed within the client, the majority of protection is provided at the server end of any e-mail communication. The sections that follow describe a wide range of techniques that can be used on the mail server to protect recipients from malware and Unsolicited Bulk E-mail (UBE), as well as preventing organisational systems being used as the source of UBE.
Any host acting as a mail server should have a DNS MX entry to be able to provide its own incoming mail service, hence any host attempting to send email without a suitable MX entry cannot receive a Non Delivery Report (NDR) and is likely to be a source of UBE. Sender Policy Framework (SPF): SPF21 addresses the problem of source address spoofing by verifying that the incoming e-mail connection is from an approved sender (as determined by the administrator of the sending domain). This is a subtle difference to the host resolving described above in that MX entries are used to define the host that handles incoming e-mail while SPF uses a custom DNS entry (SPF record type) to advertise the hosts within an organisation that are allowed to send e-mail.
Deterrence: A Conceptual Analysis by Patrick M. Morgan