解密八进制加密数据

    泛型List长度可变，所以不用数组存储字符串；str.Replace()用来去掉字符串空格；for循环(i+=3)保证3位一批；if(i+2<str.Length)保证字符串字符即使不足3个，也不会超出List集合界限；list.Add(str.Substring(i,3))用来截取字符串三位数并赋给泛型list; 泛型遍历条件是list.Count; (char)数值——把一个数值转换为字符。

Console.Write("请输入要解密的内容：");
            string str = Console.ReadLine();
            str = str.Replace(" ", "");
            List<string> list = new List<string>();
            for (int i = 0; i < str.Length; i += 3)
            {
                if (i + 2 < str.Length)
                {
                    list.Add(str.Substring(i, 3));
                }
            }
            try
            {
                for (int j = 0; j < list.Count; j++)
                    Console.Write((char)Convert.ToInt32(list[j], 8));
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
            Console.WriteLine();

数据的编码方式为ASCII(ASCII我认为是错的，现在未知2017.12.20)（基于输入3位数字）

加密为个人版八进制数据

 Console.WriteLine("请输入要加密的内容："); 
            string str = Console.ReadLine();
            char char1;
            string str1;
            List<string> list = new List<string>();
            int k, l, n;
            string m;

            for (int i = 0; i < str.Length; i += 1) 
            {
                char1 = Convert.ToChar(str.Substring(i, 1));
                str1 = Convert.ToString(char1, 8);
                if (str1.Length < 3)
                {
                    str1 = "0" + str1;
                    list.Add(str1);
                }
                else list.Add(str1); 
            }

            try
            {
                if (list.Count % 2 == 0)
                {
                    l = list.Count - 1;
                    for (k = 0; k < list.Count / 2; k++)
                    {
                        m = list[k];
                        list[k] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
                else
                {
                    l = list.Count - 2;
                    for (n = 0; n < (list.Count - 1) / 2; n++)
                    {
                        m = list[n];
                        list[n] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
            }

            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
            
            Console.WriteLine("下面是加密后的内容：");
            for (int j = 0; j < list.Count; j++)
            {
                Console.Write(list[j]);
            }
            Console.ReadKey();

解密个人版八进制加密数据

   Console.WriteLine("请输入要解密的内容：");
            string str = Console.ReadLine();
            int k, l, n;
            string m;
            str = str.Replace(" ", "");
            List<string> list = new List<string>();
            for (int i = 0; i < str.Length; i += 3)
            {
                if (i + 2 < str.Length)
                {
                    list.Add(str.Substring(i, 3));

                }
            }
            try
            {
                if (list.Count % 2 == 0)
                {
                    l = list.Count - 1;
                    for (k = 0; k < list.Count / 2; k++)
                    {
                        m = list[k];
                        list[k] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
                else
                {
                    l = list.Count - 2;
                    for (n = 0; n < (list.Count - 1) / 2; n++)
                    {
                        m = list[n];
                        list[n] = list[l];
                        list[l] = m;
                        --l;
                    }

                }

                Console.WriteLine("下面是已解密的内容：");
                for (int j = 0; j < list.Count; j++)
                {
                    Console.Write((char)Convert.ToInt32(list[j], 8));
                }
            }

            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
            Console.ReadKey();

中英加解密终版(基于ASCII和visual studio 2017的中文默文编码标准)

加密

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
           
           try
            {
               
           Console.WriteLine("请输入要加密的内容：");
            string str = Console.ReadLine();
            char char1;
            string str1;
            List<string> list = new List<string>();
            int k, l, n;
            string m;

            for (int i = 0; i < str.Length; i += 1)
            {
                char1 = Convert.ToChar(str.Substring(i, 1));
                str1 = Convert.ToString(char1, 8);
                if (str1.Length < 2)
                {
                    str1 = "00000" + str1;
                    list.Add(str1);
                }
                else if (str1.Length < 3)
                {
                    str1 = "0000" + str1;
                    list.Add(str1);
                }
                else if (str1.Length < 4)
                {
                    str1 = "000" + str1;
                    list.Add(str1);
                }
                else if (str1.Length < 5)
                {
                    str1 = "00" + str1;
                    list.Add(str1);
                }
                else if (str1.Length < 6)
                {
                    str1 = "0" + str1;
                    list.Add(str1);
                }

                else list.Add(str1);
            }













             if (list.Count % 2 == 0)
                {
                    l = list.Count - 1;
                    for (k = 0; k < list.Count / 2; k++)
                    {
                        m = list[k];
                        list[k] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
                else
                {
                    l = list.Count - 2;
                    for (n = 0; n < (list.Count - 1) / 2; n++)
                    {
                        m = list[n];
                        list[n] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
            }

            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }

            Console.WriteLine("下面是加密后的内容：");
            for (int j = 0; j < list.Count; j++)
            {
                Console.Write(list[j]);
            }
            Console.ReadKey();

        }
    }
}

    

解密

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int k, l, n;
            string m;
            Console.WriteLine("请输入要解密的内容：");
            string str = Console.ReadLine();
            str = str.Replace(" ", "");
            List<string> list = new List<string>();
            for (int i = 0; i < str.Length; i += 6)
            {
                if (i + 5 < str.Length)
                {
                    list.Add(str.Substring(i, 6));
                }
            }
            try
            {
                if (list.Count % 2 == 0)
                {
                    l = list.Count - 1;
                    for (k = 0; k < list.Count / 2; k++)
                    {
                        m = list[k];
                        list[k] = list[l];
                        list[l] = m;
                        --l;
                    }
                }
                else
                {
                    l = list.Count - 2;
                    for (n = 0; n < (list.Count - 1) / 2; n++)
                    {
                        m = list[n];
                        list[n] = list[l];
                        list[l] = m;
                        --l;
                    }

                }
                Console.WriteLine("下面是已解密的内容：");

                for (int j = 0; j < list.Count; j++)
                {
                    Console.Write((char)Convert.ToInt32(list[j], 8));

                }
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }

            Console.WriteLine();
        }
    }
}