Bouncy Castle – Open-source cryptographic APIs

Welcome to the home of the Legion of the Bouncy Castle and its FIPS-certified open-source cryptographic APIs for Java and C#.

Legion of the Bouncy Castle

Download Bouncy Castle 

Download the Bouncy Castle APIs for Java, Java FIPS, Java LTS, C# .NET, C# .NET FIPS or the Kotlin version. 

Read the Documentation 

Access necessary resources for your project here: installation instructions, configuration guides, test examples, and much more.

Join the Discussion

You can ask your questions and learn from specialists in the Bouncy Castle forum on GitHub Discussions.

Here at the Legion of the Bouncy Castle, we believe in cryptography 

We have been providing cryptography solutions for over 20 years, offering FIPS certifications, LTS releases, and quantum-ready support to meet everyone's needs.


Years of history


Years FIPS certified


Downloads per month

Get inspired

Stay up-to-date on the latest Bouncy Castle news and updates through our news feed. From product releases to the newest tutorial videos, guides, and events, our feed provides the latest information on all things related to Bouncy Castle.

Keyfactor Event
Implementing Cryptography
Post-Quantum Cryptography
23 July, 2024

Navigating the Quantum Readiness Journey: Securing Kubernetes with Quantum-Resistant Cryptography

Did you miss the in late June? No worries! Catch up with the insightful pres...
Keyfactor Blog
17 July, 2024

David Hooks’ Insights from the “What’s Next for Open Source?” event

On the Keyfactor Blog, you can read David Hooks’ insights from particip...
Keyfactor Event
Implementing Cryptography
Industrial Cybersecurity & IoT
Installation & Deployment
Post-Quantum Cryptography
16 June, 2024

Tomas Gustavsson will be speaking at #CNSCon in Seattle.

Tomas Gustavsson, our Chief PKI Officer, will be speaking at #CNSCon North Am...

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