FossaGuard: Encrypt Gmail with S/MIME is a email extension for chrome. also, it is encryption extension. it's a free extension , it has 1,000+ active users since released its first version, it earns an average rating of 2.87 from 15 rated user, last update is 1286 days ago.
Secure e-mailing with Gmail becomes easy on Desktop and Android. Encrypt and Sign your Gmail messages with industry standard - S/MIME using Chrome, Yandex or Firefox browsers. Fossa Server and Fossa Guard web extension provide secure mailing solution on top of Gmail (TM) following S/MIME specification. Fossa Guard generates key pair within your browser then Fossa Server securely supplies you with personal X.509 certificate upon Certificate Signing Request (CSR) so that your private key always stays with you. Use Fossa Guard extension to sign or to encrypt your email with X.509 certificate. The certificate is free and stays valid for 3 months (beta phase limitation). Fossa Guard has own autonomous Compose dialog to avoid unsecured email content auto-saving. Your private key is protected by pass-phrase and is replicated alongside with trusted certificates via your protected local user storage. Use Fossa Guard to get details on certificates in your repository. Please refer to Privacy policy at https://fossa.me/policy
You could download the latest version crx file or older version files and install it.
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57% user give 4-star rating, 29% user give 2-star rating, 14% user give 1-star rating. Read reviews of fossaguard: encrypt gmail with s/mime
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it just doesn't work. It's just too complicated. Tried this, tried that, free version, paid - it would just never work, always something new coming up. Not mature yet.
I had high hopes for this but entering email addresses by hand (instead of them popping up as they do in Gmail) was an issue, complicated by the email address always showing one less letter than I actually typed. That was quite annoying. ***UPDATE: This aspect suddenly started working properly after exiting my browser and restarting it, and logging in to Chrome again. *** I then attempted to send an email from within the extension, and it warned me that it would be sent unencrypted and asked me if I wanted to continue. I chose to continue but it then failed telling me that the recipient wasn't secure (diff wording). So it could not even send an email out insecurely. This has proven to be frustrating and a waste of my time. Too bad.
This is a great start. Just playing with it for a bit and I was able to send smime encrypted between my work and gmail email. Needed to figure out how to add my work smime cert as a trusted endpoint. I see I have a fossa smime cert in my windows key store. I will see what happens later when trying to setup on a different computer. I suppose I could backup and import my fossa smime cert. Great Job. This is pretty good. I don't think there is much out there like this. Keep up the great work!