Using libsodium, there are two routes you can go: - crypto_box() for authenticated public-key encryption - crypto_box_seal() for anonymous public-key e

Using libsodium, there are two routes you can go: - crypto_box() for authenticated public-key encryption - crypto_box_seal() for anonymous public-key encryption (with message authentication) I know for a fact that there are JS bindings for libsodium. http://doc.libsodium.org/bindings_for_other_languages/index.html http://doc.libsodium.org/bindings_for_other_languages/index.... For PHP developers: https://github.com/paragonie/pecl-libsodium-doc/blob/master/chapters/05-publickey-crypto.md#crypto-box https://github.com/paragonie/pecl-libsodium-doc/blob/master/... https://github.com/paragonie/pecl-libsodium-doc/blob/master/chapters/08-advanced.md#crypto-box-seal https://github.com/paragonie/pecl-libsodium-doc/blob/master/...