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

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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.

PKI hierarchies - 1, 2, 3 tiers ?
Implementing Cryptography
Installation & Deployment
Post-Quantum Cryptography
Tech Update
23 May, 2024

Quantum-ready algorithms unveiled – It is time to get to know the new guys on the street!

Welcome to KEYMASTERs! In this episode, you will join Tomas and Sven as they...
PKI hierarchies - 1, 2, 3 tiers ?
Implementing Cryptography
Tech Update
22 May, 2024

New Java release offers MLS support, improved OSGi support, and security updates

Bouncy Castle Java 1.78.1 Bouncy Castle Java now has an additional API suppo...
PKI hierarchies - 1, 2, 3 tiers ?
Implementing Cryptography
Industrial Cybersecurity & IoT
Installation & Deployment
Java LTS
Post-Quantum Cryptography
Tech Update
16 May, 2024

Take a look at our new Bouncy Castle website

At the risk of upsetting the web archeologists among you*, we are happy to an...

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