安全意识

一，分类
Rotational(ceasar)轮转
transposition(xor)移位
symmetric(DES,Blowfish..)对称
Asymmetric(RSA,Diffie...)---->Used for signatures and key distribution
(public key && private key)
Hash
sha1(),md5(),mhash...---->Used for in signature and validation

二，例子
敏感数据要加密
常规数据要验证
常见的问题并不是出在算法上面
安全意识
1，
str_rot13($var)
2,
if($_COOKIE['stamp] == sha1($_COOKIE['data'],KEY);
....

3,payment gw
function requestValidation()
{
$data = $this->data["id"]..............;
if(sha1($data) == $this->data["VERIFY"]) ....
数据需要加密后验证