Posted by Giles Hogben, Privacy Engineering Director

Most modern consumer messaging platforms (including Google Messages) support end-to-end encryption, but users today are limited to communicating with contacts who use the same platform. This is why Google is strongly supportive of regulatory efforts that require interoperability for large end-to-end messaging platforms.

For interoperability to succeed in practice, however, regulations must be combined with open, industry-vetted, standards, particularly in the area of privacy, security, and end-to-end encryption. Without robust standardization, the result will be a spaghetti of ad hoc middleware that could lower security standards to cater for the lowest common denominator and raise implementation costs, particularly for smaller providers. Lack of standardization would also make advanced features such as end-to-end encrypted group messaging impossible in practice – group messages would have to be encrypted and delivered multiple times to cater for every different protocol.

With the recent publication of the IETF’s Message Layer Security (MLS) specification RFC 9420, messaging users can look forward to this reality. For the first time, MLS enables practical interoperability across services and platforms, scaling to groups of thousands of multi-device users. It is also flexible enough to allow providers to address emerging threats to user privacy and security, such as quantum computing.

By ensuring a uniformly high security and privacy bar that users can trust, MLS will unleash a huge field of new opportunities for the users and developers of interoperable messaging services that adopt it. This is why we intend to build MLS into Google Messages and support its wide deployment across the industry by open sourcing our implementation in the Android codebase.

Posted by Jon Markoff and Sean Smith, Android Security and Privacy Team

Integrating security into your app development lifecycle can save a lot of time, money, and risk. That’s why we’ve launched Security by Design on Google Play Academy to help developers identify, mitigate, and proactively protect against security threats.

The Android ecosystem, including Google Play, has many built-in security features that help protect developers and users. The course Introduction to app security best practices takes these protections one step further by helping you take advantage of additional security features to build into your app. For example, Jetpack Security helps developers properly encrypt their data at rest and provides only safe and well known algorithms for encrypting Files and SharedPreferences. The SafetyNet Attestation API is a solution to help identify potentially dangerous patterns in usage. There are several common design vulnerabilities that are important to look out for, including using shared or improper file storage, using insecure protocols, unprotected components such as Activities, and more. The course also provides methods to test your app in order to help you keep it safe after launch. Finally, you can set up a Vulnerability Disclosure Program (VDP) to engage security researchers to help.

In the next course, you can learn how to integrate security at every stage of the development process by adopting the Security Development Lifecycle (SDL). The SDL is an industry standard process and in this course you’ll learn the fundamentals of setting up a program, getting executive sponsorship and integration into your development lifecycle.

Threat modeling is part of the Security Development Lifecycle, and in this course you will learn to think like an attacker to identify, categorize, and address threats. By doing so early in the design phase of development, you can identify potential threats and start planning for how to mitigate them at a much lower cost and create a more secure product for your users.

Improving your app’s security is a never ending process. Sign up for the Security by Design module where in a few short courses, you will learn how to integrate security into your app development lifecycle, model potential threats, and app security best practices into your app, as well as avoid potential design pitfalls.