对字符串进行加密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TEST___1
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("请输入原字符串");
string s_test = Console.ReadLine();
Console.WriteLine("请输入密钥字符串");
string s_key = Console.ReadLine();
if (s_test.Length != s_key.Length)
{
Console.WriteLine("密钥字符串与原字符串长度必须相等");
return;
}
string ch = "";
string s_result = "";
for (int i = 0; i < s_test.Length; i++)
{
ch += s_test[i];
s_result +=(char) (ch[i] ^ s_key[i]);

}

Console.WriteLine("加密后的字符串为：");
Console.WriteLine(s_result);
Console.ReadLine();
}
}
}