--- title: "Manipulating time through (S)NTP" url: https://daily.dev/posts/manipulating-time-through-s-ntp-twmjgjajk source_url: https://tweedegolf.nl/en/blog/142/manipulating-time-through-sntp type: article source: "Tweede golf" published: 2026-05-31T07:54:18.977Z updated: 2026-05-31T09:03:31.311Z tags: ["security"] reading_time: 12 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Manipulating time through (S)NTP **[Tweede golf](https://daily.dev/sources/tweedegolf)** · 12 min read · 0 upvotes · 0 comments ## Summary NTP and SNTP packets are unauthenticated, making them vulnerable to spoofing attacks that can manipulate a device's system clock. The post explains how forged NTP packets can be sent or intercepted via ARP spoofing to alter system time on Linux (systemd-timesyncd), Windows, and Android. Linux's timesyncd is particularly vulnerable, accepting any time offset. Consequences of time manipulation include disrupted timed events, shifted access windows, broken cryptographic guarantees (TOTP, TLS certificates, keystream replay), and corrupted distributed system data. The post recommends Network Time Security (NTS) as the proper mitigation, which adds authenticated key exchange to NTP, though adoption is still limited. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Meet the unsung silent hero of cyber resilience you’ve been ignoring](https://daily.dev/posts/meet-the-unsung-silent-hero-of-cyber-resilience-you-ve-been-ignoring-7ptkbr7wa) · CSO Online · 0 upvotes · 0 comments - [Welcome to the home of the Network Time Protocol \(NTP\) Project.](https://daily.dev/posts/welcome-to-the-home-of-the-network-time-protocol-ntp-project--ox0k0u0vs) · Hacker News · 1 upvotes · 0 comments - [How To Set Up Time Synchronization on Ubuntu](https://daily.dev/posts/how-to-set-up-time-synchronization-on-ubuntu-wzwzfyhjd) · DigitalOcean Community · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security) [View this post on daily.dev](https://daily.dev/posts/manipulating-time-through-s-ntp-twmjgjajk)