一种非线性流式加密算法,对称加密，它的加密和解密都是用同一把密钥完成。对称加密比不对称加密快得多，但缺点在于，它的安全性完全依赖于保持密码的机密性。

不对称加密，它要求使用两个密钥，一个是公共的（公钥），另一个是私有的（私钥）。每个密钥都要求使用另一个密钥来解密一条消息。它的复杂性提高，因此没有普及。

-a nonlinear flow encryption algorithms, symmetric encryption, the encryption and decryption are with the same key completion. Symmetric encryption faster than asymmetric encryption, but the drawback is that its security depends entirely on maintaining the confidentiality of passwords. Asymmetric encryption, it requires the use of two keys, one public (public key), and the other is owned by the (private key). Each key has requested the use of another key to a declassified information. Its complexity and therefore not universal.