PHP加密技术专题

a)         单向

                         i.              MD5()

                       ii.              Crypt($str[,$salt]):$salt加密时串的干扰，使编码更安全

                      iii.              Sha1()

b)         URL编码

                         i.              urlencode($str);编码

                       ii.              urldecode($str);解码

                      iii.              rawurlencode($str):编码

                      iv.              rawurldecode($str):解码

c)         Base64编码：加密图片等

                         i.              base64_encode($data):编码

                       ii.              base64_decode($data[,$strict=false]):解码

                      iii.              <img src="data:image/jpeg;base64,$str">

                      iv.              <img src="data:;base64,$str">

                       v.              $str为编码之后的字符串

d)         加密技术：

                         i.              单向散列加密技术

                       ii.              对称加密技术

                      iii.              非对称加密技术