While this did not impact the privacy of our users’ data, it negatively impacted the user experience for those affected. “This meant that some users had difficulty connecting to the ProtonMail website. Kläusli said all SwissSign’s systems remain fully operational, no data was compromised, and that the incident was reported to the Swiss National Cyber Security Centre.īut in a blog post published by ProtonMail on the same day, the secure email provider said they had “decided to temporarily switch to Let’s Encrypt because we believe they can offer a higher level of reliability after” the attacks, “which led to interruptions of our services”.Ī spokesperson for ProtonMail told The Daily Swig: “The DDoS attack prevented web browsers from verifying the validity of the certificates used by us to prove our identity and encrypt web traffic. The attacks have ceased since September 8, he added. Measures taken “with external partners to fend-off the attacks” then “proved to be very effective and our systems were up and running again a few days after the attack started, despite ongoing heavy DDoS attacks. “This meant that security certificates could not be checked for validity which of course impacted some of our customers,” he told The Daily Swig. “Some browsers don’t allow to access a website without a valid SSL certificate.” Thomas M Kläusli, head of marketing and communications at SwissSign, said the cyber-attack took down its OSCP service. ![]() On September 1, SwissSign reported that its “products and services are currently impaired, and availability is limited” following a series DDoS attacks that began 24 hours earlier and reached up to 40 Gbps in magnitude. ![]() ![]() UPDATED A barrage of DDoS attacks against SwissSign has resulted in the certificate authority (CA) temporarily losing a key customer, as email provider ProtonMail moved over to Let’s Encrypt amid the disruption. Secure email provider shifts to Let’s Encrypt, citing reliability issues with Swiss counterpart
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