The password store in Yesod contains nice documentation about how it works. I found it very enlightening and reassuring to read:
<a href="https:&#x2F;&#x2F;github.com&#x2F;yesodweb&#x2F;yesod&#x2F;blob&#x2F;master&#x2F;yesod-auth&#x2F;Yesod&#x2F;PasswordStore.hs" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;yesodweb&#x2F;yesod&#x2F;blob&#x2F;master&#x2F;yesod-auth&#x2F;Yes...</a>