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数学中最简单的就是加法和减法。然而在计算机中，最简单的运算却是AND、OR和NOT。计算机是怎样实现这些基本运算，以及怎样通过这些基本运算完成加法的计算呢？

数学中最简单的就是加法和减法。然而在计算机中，最简单的运算却是AND、OR和NOT。计算机是怎样实现这些基本运算，以及怎样通过这些基本运算完成加法的计算呢？

For ordinary laptop and smartphone users, Wi-Fi is not ideal - but it’s sometimes near-inescapable.

APT actors trying to use big events as a lure to compromise their targets is nothing new. Tibetan NGOs being targeted by APT actors is also nothing new. Thus, surrounding the upcoming G20 2014 summit that is held in Brisbane, Australia, we were expecting to see G20 themed threats targeted at Tibetan NGOs. A Win32/Farfli (alias Gh0st RAT) sample ultimately confirmed our suspicions.

ESET study reveals many IT professionals are guilty of storing indecent material on their mobile phones, which would leave them embarrassed if lost.

Microsoft's .NET framework, which is used to build millions of websites and online applications, is taking further steps to go completely open-source, Microsoft has announced at the Connect() virtual development event. The company also stated its commitment to eventually ensure the free code runs on Mac OS and Linux too, Wired reports.

After taking a look at recent Korplug (PlugX) detections, we identified two larger scale campaigns employing this well-known Remote Access Trojan. This blog gives an overview of the first one

MS14-066, CVE-2014-6321, 微软Secure Channel远程代码执行漏洞(版本通杀)

The Sednit espionage group, also known as the Sofacy group, APT28 or “Fancy Bear”, has been targeting various institutions for many years. We recently discovered a component the group employed to reach physically isolated computer networks -- “air-gapped” networks -- and exfiltrate sensitive files from them through removable drives.

Mobile payments look set to be one of the defining technologies of 2015, as the launch of Apple Pay catalyses a boom in cardless payments - both from Apple’s own system, and rivals playing catch-up.

A new malware has been discovered that targets both Apple Mac computers and iPhones, Neowin reports. It is the first known malware that can infect iPhones that have not been jailbroken.

Facebook has opened its doors to privacy concerned users, but opening up a dedicated Tor link, guaranteeing that people who visit the social networking site through anonymous browsers aren't mistaken for botnets, Gizmodo reports.

Learn how to update Adobe Flash Player, to help protect against malware attacks.

An army of the undead, wreaking havoc on the Internet – it's a nightmare scenario that has played out many times as the population of humans online has exploded. Some zombie plagues have been particularly troubling, and we will take a look at the worst of the worst.

Last month, we presented “The Evolution of Webinject” in Seattle at the 24th Virus Bulletin conference. This blog post will go over its key findings and provide links to the various material that has been released in the last few weeks.