snuck.me is an open-source web service for querying an arbitrary site’s SSL certificate. A user can compare the results of this query with the certificate that her browser is reporting to help determine if there is a man in the middle: See the blog post here: https://jlospinoso.github.io/node/javascript/security/cryptography/privacy/2017/02/20/snuckme-cert-query.html
snuck.me
Free, open-source service for detecting SSL/TLS man-in-the-middle from your browser
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