> For the complete documentation index, see [llms.txt](https://joungkyun.gitbook.io/annyung-3-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://joungkyun.gitbook.io/annyung-3-user-guide/annyung3-package-catalog/annyung3-addon-packages/pkg-addon-google-authenticator.md).

# google-authenticator

## Description:

login 시에 2단계 인증을 가능하게 해주는 PAM 인증 모듈.

Google OPT와 연동이 가능하며, iOS와 Android App으로 지원합니다.

## Features:

* HMAC-Based One-time Password(HOTP) 지원
* Time-based One-time Password(TOTP) 지원

## Reference:

* <https://github.com/google/google-authenticator>
* <https://www.lesstif.com/pages/viewpage.action?pageId=24444948>

## Dependencies:

* [pam](/annyung-3-user-guide/annyung3-package-catalog/annyung3-base-packages/pkg-base-pam.md)

## Sub Packages:

* None

## Related Packages:

* None