Windows NTLM (NT Lan Manager) is a Microsoft authentication protocol used with the SMB (Server Message Block) protocol.
A lot of the protocol was reverse engineered by the Samba team – the people behind the Samba server that allow UNIX machines to share files and printers with a Windows client.
User Access Control (UAC) was introduced as a security infrastructure in Microsoft Windows Vista. It aims to improve the security of Microsoft Windows by limiting privileges of application software. Any request for an increase in privilege level has to be authorised by an administrator. In this way, only trusted applications receive higher privileges.
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