在 http://ppa.launchpad.net/ondrej/php/ubuntu/pool/main/libs/libsodium/ 找到适用于 Ubuntu 16.04 的 libsodium23 即可安装。
一组关于椭圆曲线密钥交换的好文
http://andrea.corbellini.name/2015/05/17/elliptic-curve-cryptography-a-gentle-introduction/
http://andrea.corbellini.name/2015/05/23/elliptic-curve-cryptography-finite-fields-and-discrete-logarithms/
http://andrea.corbellini.name/2015/05/30/elliptic-curve-cryptography-ecdh-and-ecdsa/
http://andrea.corbellini.name/2015/06/08/elliptic-curve-cryptography-breaking-security-and-a-comparison-with-rsa/
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