How to Decode a Double-Obfuscated Base64 String?

Decrypting Base64 Encoded Strings

The provided Base64 string appears to be encrypted using two layers of obfuscation. To decode it, we need to reverse these processes.

Reversing the First Obfuscation

The first obfuscation involves using the following code:

private static string m000493(string p0, string p1)
{
    // ...
}

Where p1 is "_p0lizei". This code appears to XOR the characters of p0 with the characters of p1. To reverse this, we can perform the same operation again, but this time XORing the decoded base64 string with "_p0lizei".

Deobfuscating the Base64 String

The second obfuscation involves converting the encoded string to Base64. To deobfuscate this, we can simply convert the Base64 string back to its original binary representation using:

byte[] data = Convert.FromBase64String(encodedString);

Final Step: Decoding the Original String

Once we have reversed both layers of obfuscation, we are left with the original string. We can decode this using:

string decodedString = System.Text.Encoding.UTF8.GetString(data);

Example

Using the provided Base64 string and following the above steps, we can decode it and obtain the original string.

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