Those who worry that Gmail or the National Security Agency may be rifling through their emails now have a new alternative: ProtonMail, a super-secure email service created by students from Harvard and the Massachusetts Institute of Technology.

“It was the Snowden leaks that got us started,” ProtonMail founder and front-end developer Jason Stockman told The Huffington Post. “A lot of us at the time were working at CERN, the nuclear research facility in Switzerland, and we started hearing about all this and we really freaked out. We ended up posting on Facebook about privacy issues, and it just grew from there.”

ProtonMail’s open beta launched [Saturday May 17th], and its security measures are intense: end-to-end encryption and user authentication protocols so rigorous even the creators can’t read user emails.

Read More: These Harvard And MIT Kids Say They’ve Made NSA-Proof Email | HuffPo