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System.Security.Cryptography
RSACryptoServiceProvider rsaSend = new RSACryptoServiceProvider();
string plaintext = "Ã÷ÎÄ"; //Ã÷ÎÄ
byte[] ciphertext = rsaSend.Encrypt(System.Text.Encoding.UTF8.GetBytes(plaintext), false); //¼ÓÃܺó
lbl.Text = Convert.ToBase64String(ciphertext); //ÏÔʾ¼ÓÃܺóµÄ£¬ÎªÁËÏÔʾ²»¿É¼û×Ö·û£¬Ê¹ÓõÄÊÇ Base64 ±àÂë¡£
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string plaintext = "Ã÷ÎÄ";
byte[] srcBuffer = System.Text.Encoding.UTF8.GetBytes(plaintext);
HashAlgorithm hash = HashAlgorithm.Create("SHA1"); //½«²ÎÊý»» ......