Tag Archives: cryptography

利用公私钥实现无密码登录

1. 先用 SecureCRT 创建 Openssl 格式的 公私钥 2. 上传公钥到 $HOME/.ssh/authorized_keys 3. 修改 /etc/ssh/sshd_config PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys #这里是到用户根目录的相对路径 重启 sshd Continue Reading →

By Dongsheng Cai • December 7, 2008 – 6:09 pm • Posted in OS • Tagged , • Comments (0)

PHP 的 OpenSSL 库

书接上回，在研究 XML 签名之前先研究一下 OpenSSL 库。 签名和原理 PHP 签名的函数原型是： bool openssl_sign ( string $data , string &$signature , mixed $priv_key_id [, Continue Reading →

By Dongsheng Cai • September 27, 2008 – 12:23 pm • Posted in Programming • Tagged • Comments (1)

DSA 与 RSA 的区别

DSA 用于签名，而 RSA 可用于签名和加密。 DSA is faster in *signing*, but slower in *verifying*. A DSA key of the same strength Continue Reading →

By Dongsheng Cai • August 30, 2008 – 12:16 pm • Posted in OS • Tagged • Comments (0)