Here’s the Dropbox paper[0] and presentation(YouTube)[1] on zxcvbn from the 2016 USENIX security conference:<p>[0] <a href="https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_wheeler.pdf" rel="nofollow">https://www.usenix.org/system/files/conference/usenixsecurit...</a><p>[1] <a href="https://youtube.com/watch?v=vf37jh3dV2I&feature=shares">https://youtube.com/watch?v=vf37jh3dV2I&feature=shares</a>
BitWarden has a web tool that lets users securely use zxcvbn to test password strength: <a href="https://bitwarden.com/password-strength/" rel="nofollow">https://bitwarden.com/password-strength/</a>