As of its latest update, Google’s Android operating system is getting a major boost in network security and privacy features. Android 17 introduces support for Encrypted Client Hello (ECH), a new standard that makes it harder for internet service providers (ISPs) and Wi-Fi operators to track users’ online activities.
For those unfamiliar with the technical jargon, ECH works by encrypting the opening part of the Transport Layer Security (TLS) handshake. This is the process that occurs when a user’s device establishes a secure connection to a website or service using HTTPS. Even if the connection itself is encrypted, ISPs and Wi-Fi operators can still see which domain name was visited, allowing them to collect metadata that can be used for commercial profiling purposes.
With Android 17, this metadata is now hidden from view. The new ECH standard operates in conjunction with private DNS, encrypting the destination website name from the start of the connection. This makes it much harder for network providers and snoopers to track users’ online activities.
Android users will benefit from these enhanced security features when browsing with compatible browsers like Chrome 117 or later, or Firefox 119 or later. However, Android 17 incorporates ECH at the platform level, ensuring that all apps targeting this version of the operating system are protected by default.
But how does it work? When an app targets Android 17 and uses a compatible networking library, such as OkHttp, WebView, or HttpEngine, ECH will be enabled by default. This means that on servers that support ECH, Android will now encrypt the hostname. On servers that don’t support this protection system, Android will send a fake encrypted client hello field called ECH GREASE to blend in with real ECH connections.
Google’s Jigsaw unit has extensively tested ECH GREASE against the top 10,000 domains and across 740 internet providers in 202 countries, finding no issues or unexpected network blocks. This is a significant development, as it ensures that users’ online activities are protected without compromising on website loading times or network performance.
Beyond ECH support, Android 17 also introduces other key security features that improve user protection. One of these is the enhancement of Local Network Protection, which now requires apps to obtain permission before scanning for or connecting to devices on the user’s local network. This reduces the risk of rogue apps exploiting vulnerabilities in home networks.
Another significant change is the enabling of Certificate Transparency by default. This feature ensures that website certificates appear in public logs, making it easier to detect forged certificates and protect users from phishing attacks.
Finally, Google has announced that participating mobile operators will now be able to automatically turn off 2G for subscribers, reducing their exposure to SMS blasters and rogue base stations that can deliver malicious messages or capture sensitive traffic from nearby devices.
In summary, Android 17’s enhanced security features provide a significant boost in user protection. By incorporating ECH support at the platform level, Google is making it harder for network providers and snoopers to track users’ online activities. This is a crucial step towards protecting user privacy in an increasingly complex digital landscape.
So what can you do to protect yourself? First and foremost, ensure that your Android device is updated to the latest version of the operating system. Additionally, use compatible browsers like Chrome or Firefox, which are designed to work seamlessly with ECH support. By taking these simple steps, you’ll be better equipped to defend against online threats and maintain your digital security.
Source: Bleeping Computer — 2026-08-27