Cracking the Code /txvhlhrxhhw

If you are a web developer, you might have encountered some strange strings of letters and numbers in your code, such as /txvhlhrxhhw. What are they and how can you decode them?

These strings are called URL-encoded characters, and they are used to represent characters that are not allowed or unsafe in a URL. For example, spaces, slashes, question marks, and other symbols can cause problems when used in a URL, so they are replaced by a percent sign (%) followed by two hexadecimal digits that correspond to their ASCII code.

For example, the space character has an ASCII code of 32, which is 20 in hexadecimal. So a space is encoded as %20 in a URL. Similarly, the slash character (/) has an ASCII code of 47, which is 2F in hexadecimal. So a slash is encoded as %2F in a URL.

/txvhlhrxhhw These Characters

To decode these characters, you need to reverse the process and convert the hexadecimal digits back to their ASCII codes, and then to their corresponding characters. For example, /txvhlhrxhhw can be decoded as follows:

– %2F -> 47 -> /
– t -> t
– x -> x
– v -> v
– h -> h
– l -> l
– h -> h
– r -> r
– x -> x
– h -> h
– h -> h
– w -> w

So /txvhlhrxhhw is decoded as /txvhlhrxhhw. As you can see, this string does not contain any special characters that need to be encoded, so it is the same as its decoded version.

However, some strings might have more complex encodings that involve multiple levels of encoding. For example, /%25E6%2596%25B0%25E5%2590%258C%25E6%2596%2587%25E5%25A0%2582 is encoded twice: first with UTF-8 encoding, and then with URL encoding. To decode it, you need to apply both decoding methods in reverse order: first URL decoding, and then UTF-8 decoding.

URL decoding:

– %25 -> 37 -> %
– E6 -> E6
– %25 -> 37 -> %
– 96 -> 96
– %25 -> 37 -> %
– B0 -> B0
– %25 -> 37 -> %
– E5 -> E5
– %25 -> 37 -> %
– 90 -> 90
– %25 -> 37 -> %
– 82 -> 82
– %25 -> 37 -> %
– E6 -> E6
– %25 -> 37 -> %
– 96 -> 96
– %25 -> 37 -> %
– 87 -> 87
– %25 -> 37 -> %
– E5 -> E5
– %25 -> 37 -> %
– A0 -> A0
– %25 -> 37 -> %
– 82 -> 82

So /%25E6%2596%25B0%25E5%2590%258C%25E6%2596%2587%25E5%25A0%2582 is decoded as /%E6%96%B0%E5%90%8C%E6%96%87%E5%A0%82.

UTF-8 decoding:

Each pair of hexadecimal digits represents one byte of a UTF-8 encoded character. To decode them, you need to group them according to their first byte and then convert them to their Unicode code point.

For example: /txvhlhrxhhw

– E6 96 B0 is a group of three bytes that starts with E6. This means that it is a UTF-8 encoded character that uses three bytes. The first byte tells us that the first four bits of the Unicode code point are 1110 (E), and the remaining bits are from the next two bytes after removing the leading bits of 10. So we get:

11100110 10010110 10110000

Removing the leading bits of each byte:

0010 011010 110000

Concatenating the remaining bits:

0010011010110000

Converting to hexadecimal:

24B8

So E6 96 B0 is decoded as U+24B8.

Similarly, /txvhlhrxhhw

– E5 90 82 is decoded as U+540C.
– E6 96 87 is decoded as