This article analyses the evolution and interplay of national policies and international diplomacy on cyber terrorism within and across the UNSC's permanent five members and the UN process on cyber norms (GGE and OEWG). First, it reveals how -through the extension of preemptive measures to low-impact cyber activities and online content -national policies progressively articulate cyber terrorism as an issue of information security. Second, it problematizes howthrough the adoption of comprehensive and imprecise definitions -the diplomatic language on cyber terrorism might lend international support to those authoritarian regimes keen on leveraging counter-terrorism to persecute domestic oppositions and vulnerable groups. Third, it concludes that -with UN diplomatic efforts increasingly discussing countering (dis)information operations -combining normative debates on cyber terrorism with those on information security requires precision of language to safeguard human rights globally.Cyber terrorism is an elusive concept. Most definitions make a distinction between on the one hand politically motivated violent acts, or the threat thereof, using the internet, and on the other hand all the preparatory and supporting activities for terrorism done on or via the internet, such as recruitment, communication and financing. Governments fear the violent terrorist act the most but, given that "pure" cyber terrorism has not yet materialized, have mostly focused on countering the preparatory and supporting digital activities of suspected terrorists and radicalized actors. Given the "low probability, high impact" character of terrorism, counter terrorism policies have seen a high degree of political and legal exceptionalism, especially in the wake of the 9-11 attacks and the ensuing "war on terror". 1 Given that cyber terrorism is part and parcel of the digital domain, cyber counter terrorism has become intertwined with another general trend in national security and law enforcement, that of the development of the digital surveillance state. 2 The general trend of states trying to increase security by means of online surveillance has been prevalent in international security and foreign intelligence 3 and in domestic and international law enforcement. 4 This has sparked many debates about the proportionality