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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Take a look at zerotier it's open source, they offer a free tier and you can even bake it directly into your app(they have a library on GitHub lizbt. Unless you are willing to become a security analyst don't roll your own crypto it's never worth it, use a vpn or something https based.
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