如何将整数加密为一个五个字符的字符串？ [英] How do you encrypt an integer to a string of five characters?

问题描述

我需要一个C＃方法将一个整数加密到一个字符串的五个字符，其中有效的字符是az，AZ，0-9

I need a C# method to encrypt an integer to a string of five characters where valid characters are a-z, A-Z, 0-9

我需要这样做，因为我发送的URL给这样的用户...

I need to do this because I am sending URLs to users that look like this...

http://www.website.com.au/3

用户将在此URL查看特定于此的URL的数据。数据不是超敏感的，但是通过输入下一个数字来查看别人的广播是不可接受的：

Users will see data at this URL that is specific to them. The data is not ultra sensitive, but it is seen as unacceptable to view someone else's broadcast simply by entering the next number:

http://www.website.com.au/4

然而，还需要保留URL的缩写可读，因为URL可以通过短信向您发送，我们不想通过大量长的加密值来消除文本消息空间，因此

However there is also a need to keep the URL's short and readable as the URLs could reach you via a text message and we don't want to loose text message space by a massively long encrypted value so

http://www.website.com.au/3

可能成为

http://www.website.com.au/a6Yqo

我意识到这个级别的加密相当薄弱，但对于这些广播来说这是非常好的

I realise this level of encryption is quite weak but it is good enough for these broadcasts

public string Encrypt(int number)
{
}

public int Decrypt(string encrypted)
{
}

我从哪里开始？

推荐答案

不完全是你需要的，但会做这个工作/ p>

Not exactly what you need but will do the job

    public static string Encrypt(int value)
    {
        return Convert.ToBase64String(BitConverter.GetBytes(value)).Replace("==","");
    }

    public static int Decrypt(string value)
    {
        if(value.Length!=6)
            throw new ArgumentException("Invalid length.");

        return BitConverter.ToInt32(Convert.FromBase64String(value + "=="),0);
    }

结果：

0 : AAAAAA

1 : AQAAAA

2 : AgAAAA

3 : AwAAAA

4 : BAAAAA

5 : BQAAAA

6 : BgAAAA

7 : BwAAAA

8 : CAAAAA

9 : CQAAAA

10 : CgAAAA

11 : CwAAAA

12 : DAAAAA

13 : DQAAAA

14 : DgAAAA

15 : DwAAAA

16 : EAAAAA

17 : EQAAAA

18 : EgAAAA

19 : EwAAAA

20 : FAAAAA

21 : FQAAAA

22 : FgAAAA

23 : FwAAAA

24 : GAAAAA

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