如何让RSA加密相同的文本,密文每次不一样?

[110来电]

rsa.FromXmlString(PRIVATE_KEY);
System.Security.Cryptography.RSAPKCS1SignatureFormatter f =
new System.Security.Cryptography.RSAPKCS1SignatureFormatter(rsa);
f.SetHashAlgorithm("SHA1");
Byte[] source = System.Text.ASCIIEncoding.ASCII.GetBytes(comboBox1.Text);
System.Security.Cryptography.SHA1Managed sha = new System.Security.Cryptography.SHA1Managed();
Byte[] result = sha.ComputeHash(source);
Byte[] regkey = f.CreateSignature(result);
richTextBox1.Text = Convert.ToBase64String(regkey);

[110来电]

目前得到的密文总是一样的

[cnfixit]

换了私钥，就不一样了

[110来电]

不换私钥和公钥呢

[110来电]

dsa.FromXmlString(PRIVATE_KEY);
System.Security.Cryptography.DSASignatureFormatter f = new System.Security.Cryptography.DSASignatureFormatter(dsa);
f.SetHashAlgorithm("SHA1");
Byte[] source = System.Text.ASCIIEncoding.ASCII.GetBytes(comboBox1.Text);
System.Security.Cryptography.SHA1Managed sha = new System.Security.Cryptography.SHA1Managed();
Byte[] result = sha.ComputeHash(source);
Byte[] regkey = f.CreateSignature(result);
richTextBox1.Text = Convert.ToBase64String(regkey);

DSA就可以

[cnfixit]

对rsa没有什么深入的了解，不过你的需求有点那什么了吧，就好比你要求你手里的钥匙不变，还可以打开不同的锁，万能钥匙？

[cnfixit]

[Quote=引用 4 楼 的回复:]
dsa.FromXmlString(PRIVATE_KEY);
System.Security.Cryptography.DSASignatureFormatter f = new System.Security.Cryptography.DSASignatureFormatter(dsa);
f.SetHashAlgorithm("SHA1");
Byte[] source =……
[/Quote]
这应该是加解密算法有关