> For the complete documentation index, see [llms.txt](https://k-ai.gitbook.io/knowledge-ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://k-ai.gitbook.io/knowledge-ai/authentication.md).

# Authentication

- [Overview](https://k-ai.gitbook.io/knowledge-ai/authentication/authentication.md)
- [Instance API keys](https://k-ai.gitbook.io/knowledge-ai/authentication/api-keys.md)
- [Organization API keys](https://k-ai.gitbook.io/knowledge-ai/authentication/organization-api-keys.md)
- [OAuth 2.1](https://k-ai.gitbook.io/knowledge-ai/authentication/oauth.md)
- [Cookies](https://k-ai.gitbook.io/knowledge-ai/authentication/cookies.md)