Daniel Moghimi — Security Blog https://moghimi.org/blog.html Research, microarchitectural vulnerabilities, and systems security. en-us Fri, 16 Oct 2026 08:56:47 -0000 A Joint Security Review Of Intel TDX 1.5 https://moghimi.org/a_joint_security_review_of_Intel_TDX_1.5.html https://moghimi.org/a_joint_security_review_of_Intel_TDX_1.5.html Tue, 10 Feb 2026 00:00:00 -0000 Google Cloud Security and Intel conducted a five-month joint security assessment of Intel Trust Domain Extensions (TDX) 1.5, focusing specifically on advanced new capabilities for confidential... Supporting Rowhammer Research To Protect DRAM Ecosystem https://moghimi.org/supporting_rowhammer_research_to_protect_dram_ecosystem.html https://moghimi.org/supporting_rowhammer_research_to_protect_dram_ecosystem.html Mon, 15 Sep 2025 00:00:00 -0000 Rowhammer remains one of the most stubborn and persistent physical hardware vulnerabilities in modern Dynamic Random-Access Memory (DRAM). By repeatedly activating ("hammering") specific memory rows,... Downfall Performance Degradation 3 Years Later https://moghimi.org/downfall_performance_degradation_3_years_later.html https://moghimi.org/downfall_performance_degradation_3_years_later.html Fri, 12 Sep 2025 00:00:00 -0000 It’s been almost three years since I reported the Downfall vulnerability (also called Gather Data Sampling) to Intel, and its mitigation is still hurting the performance of real workloads. One of the... Secure Computer Architecture In The Post Meltdown World https://moghimi.org/secure_computer_architecture_in_the_post_meltdown_world.html https://moghimi.org/secure_computer_architecture_in_the_post_meltdown_world.html Thu, 26 Sep 2024 00:00:00 -0000 Published on the ACM SIGARCH Computer Architecture Today blog, this article examines the lasting paradigm shift in computer architecture following the disclosure of Meltdown, Spectre, and the... Downfall And Zenbleed: Googlers Helping Secure The Ecosystem https://moghimi.org/downfall_and_zenbleed:_googlers_helping_secure_the_ecosystem.html https://moghimi.org/downfall_and_zenbleed:_googlers_helping_secure_the_ecosystem.html Tue, 08 Aug 2023 00:00:00 -0000 Co-authored on the Google Online Security Blog, this post details the coordinated disclosure, ecosystem impact, and collaborative industry remediation of two critical processor vulnerabilities...