The most secure
IoT and M2M encryption.

Security    Clarity    No-nonsense

IoT encryption done right – optimized for MQTT

Teserakt's E4 is the first and only end-to-end encryption and key management solution for machine-to-machine messaging protocols. E4 is optimized for MQTT, the most popular machine-to-machine protocol, supported by all leading cloud platforms.

E4's encryption allows you to transmit sensitive data without worrying about the message relay server security. Your messages remain secret even if the relay server is compromised by an insider or remote attacker.

E4's key management eliminates the need for complex PKIs and provides greater security and flexibility, thanks to our capability to automatically enforce custom key rotation policies.

Adding E4 security to your IoT protocol does not incure any performance hit, nor extra network latency. A single instance of the E4 back-end server can support millions of devices.

Seamless integration

  • Thin client software library with no external dependency
  • Server deployed as containerized application or virtual appliance
  • No change to the broker required

End-to-end security

  • All messages encrypted, protected against replay and spoofing
  • Protects against compromised broker servers and infrastructure
  • Safe against quantum computing

Key management

  • Automation of key rotation policies for higher security
  • Live analytics, anomaly detection, and monitoring service
  • Web UI, REST, and gRPC interfaces


Teserakt AG is an international company co-founded in 2018 in Switzerland by noted cryptographer JP Aumasson and serial entrepreneur Alan Duric.

We want to make strong encryption the default for IoT and machine-to-machine communications.

We rely on our experience building secure communication software and industrial cryptography systems. Security protocols and algorithms that we designed are now deployed in millions of devices, and some have become international standards.

We have customers in diverse sectors, such as aerospace and law enforcement technology.

Find our latest news on Twitter, our open-source contributions on GitHub, our company profile and staff list on LinkedIn, and our technical posts on the blog Things' Security.


Cryptography is our core expertise. We designed algorithms now used in the Linux kernel and Apple devices.

We design secure software. A security product should improve your security posture, not diminish it.


No bells and whistles. We are not ashamed to say that our solution is simple and only supports a handful of parameters.

"Complexity is the enemy of security" is cliché but true.


Many security companies prioritize marketing over engineering and security. We don't.

No superlatives such as "military-grade", no claims of using machine learning when we don't use it.

Teserakt is proud to have the following business partners:


Our open-source repositories:

  • PQGo: Experimental post-quantum cryptography for the Go language
  • SHA3-AVR: Implementation of the SHA-3 hash functions for 8-bit AVR

To learn more about MQTT and its security, we recommend the following external resources: