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NTP (Network Time Protocol) synchronises networks to a single time source using timestamps to represent the current time of the day,Jordan 5 Grape, this is essential for time sensitive transactions and many system applications such as email,Cheap Lebron 10.
NTP is therefore vulnerable to security threats,Coach Factory Outlet Online, whether from a malicious hacker who wants to alter the timestamp to commit fraud or a DDoS attack (Distributed Denial of Service – normally caused by malicious malware that floods a server with traffic) that blocks server access,Lebron 10 Elite.
However,Coach Outlet, being one of the Internet’s oldest protocols and having been developed for over 25 years, NTP is equipped with its own security measures in the form of authentication,Coach Factory Outlet.
Authentication verifies that each timestamp has come from the intended time reference by analysing a set of agreed encryption keys that are sent along with the time information,Grapes 5. NTP, using Message Digest encryption (MD5) to un-encrypt the key,Jordan Grapes 5, analyses it and confirms whether it has come from the trusted time source by verifying it against a set of trusted keys.
Trusted authentication keys are listed in the NTP server configuration file (ntp.conf) and are normally stored in the ntp.keys file. The key file is normally very large but trusted keys tell the NTP server which set of subset of keys is currently active and which are not. Different subsets can be activated without editing the ntp.keys file using the trusted-keys config command.
Authentication is therefore highly important in protecting a NTP server from malicious attack; however there are many time references were authentication can’t be trusted.
Microsoft, who has installed a version of NTP in their operating systems since Windows 2000, strongly recommends that a hardware source is used as a timing reference as Internet sources can’t be authenticated.
NTP is vital in keeping networks synchronised but equally important is keeping systems secure. Whilst network administrators spend thousands in anti-viral/malware software many fail to spot the vulnerability in their time servers.
Many network administrators still entrust Internet sources for their time reference. Whilst many do provide a good source for UTC time (Coordinated Universal Time – the international standard of time), such as
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