> For the complete documentation index, see [llms.txt](https://docs.ont.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ont.io/decentralized-identity-and-data/ontid/ont-login/back-end-java-sdk.md).

# Back-end Java SDK

The back-end Java SDK assists the server to collect and process data required for authentication.