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If it has, something untoward has happened and an error is raised. When control is transferred to a return address on the call stack itвЂ™s checked against the shadow stack to ensure it hasnвЂ™t changed. ItвЂ™s designed to prevent control-flow hijacking by creating a вЂњshadow stackвЂќ that mirrors the call stackвЂ™s list of return addresses.

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Windows 11 extends the Hardware-enforced Stack Protection introduced in Windows 10 so that it protects code running in kernel mode as well as in user mode. Windows 11 has some new tricks up its sleeve too. In Windows 11 it forms the secure underpinning for a host of security features, including Secure BootвЂ™s big brother, Measured Boot BitLocker (Device Encryption onВ WindowsВ Home) Windows Defender System Guard Device Health Attestation Windows Hello and more. ItвЂ™s probably best known for its role in Secure Boot, that ensures computers only load trusted boot loaders, and in BitLocker disk encryption. TMP is tamper-resistant technology that performs cryptographic operations, such as creating and storing cryptographic keys, where they canвЂ™t be interfered with. It protects against bootkits that load before the operating system, and rootkits that modify the operating system.

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(ItвЂ™s a replacement for the more widely-known BIOS.) From a security standpoint, UEFIвЂ™s key feature is Secure Boot, which checks the digital signatures of the software used in the boot process. UEFI is a specification for the firmware that controls the first stages of booting up a computer, before the operating system is loaded. United Extensible Firmware Interface (UEFI)

Windows Hello Enhanced Sign-In uses VBS to isolate biometric software, and to create secure pathways to external components like the camera and TPM.

Credential Guard runs the Local Security Authority Subsystem Service in a virtual container, which stops attackers dumping credentials and using them in pass-the-hash attacks.

Application Guard, a protective sandbox for Edge and Microsoft Office that uses virtualization to isolate untrusted websites and office documents, limiting the damage they can cause.

Memory Integrity (a more digestible name for HVCI), which runs code integrity checks in an isolated environment, which should provide stronger protection against kernel viruses and malware.

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Kernel Data Protection, which uses VBS to mark some kernel memory as read only, to protect the Windows kernel and its drivers from being tampered with.

Noteworthy security features that rely on VBS include: Doing that requires hardware-based virtualization features, and enough horsepower that you wonвЂ™t notice the drag on performance. VBS runs Windows on top of a hypervisor, which can then use the same techniques that keep guest operating systems apart to create secure spaces that are isolated from the main OS. This is because Virtualization Based Security ( VBS) has become a keystone concept in MicrosoftвЂ™s approach to security. In practice that means it requires an 8th generation Intel processor, an AMD Zen 2, or a Qualcomm Snapdragon 8180. Three of the new OSвЂ™s hardware requirements play major, interlocking roles in security: All hail the hypervisorДЄt a minimum, Windows 11 requires a 64-bit, 1 GHz processor with virtualization extensions and at least two cores, and HVCI-compatible drivers.

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MooreвЂ™s Law and the enormous Windows install base mean that yesterdayвЂ™s stringent hardware requirements will rapidly turn into todayвЂ™s minimum spec. In reality the hardware requirements will only seem exacting for a short period. In effect, Microsoft is making its existing Secured-core PC standards the new baseline, so that a range of technologies that are optional in Windows 10 are mandatory, or on by default, in Windows 11.

MicrosoftвЂ™s latest OS sets a high bar for hardware, with the aim of creating a secure platform for all thatвЂ™s layered on top of it. If youвЂ™ve read anything about Windows 11 itвЂ™s probably that it will only run on вЂњnewвЂќ computers. I spoke to MalwarebytesвЂ™ Windows experts Alex Smith and Charles Oppermann to understand whatвЂ™s changed in Windows 11 and what impact it could have on security. One of those things will be whether or not Windows 11 makes them safer and more secure. The requirements and considerations of each organization will be different, and many things will inform the decisions they make about whether to stick or twist.

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Windows 11, the latest operating system (OS) from Microsoft, launches today, and organizations have begun asking themselves when and if they should upgrade from Windows 10 or older versions.

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