Let’s Encrypt, a Certificate Authority (CA) that puts the “S” in “HTTPS” for about 220m domains, has issued a warning to users of older Android devices that their web surfing may get choppy next year.

Let’s Encrypt launched four years ago to make it easier to set up a secure website. To jumpstart its trust relationship with various software and browser makers – necessary for its digital certificates to be accepted – it piggybacked on IdenTrust’s DST Root X3 certificate. As a result, the non-profit’s certificates could be presented by websites and be trusted by all the major web browsers to connect to them securely.

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