The term dark field illumination is identified in base64 scheme by the sequence ZGFyayBmaWVsZCBpbGx1bWluYXRpb24=, while the MD5 signature is equal to 2b51c423e5484256e172159bc3068b20. The ASCII encoding of dark field illumination in hexadecimal notation is 6461726b206669656c6420696c6c756d696e6174696f6e.