The term dust contamination is identified in base64 scheme by the sequence ZHVzdCBjb250YW1pbmF0aW9u, while the MD5 signature is equal to d65cf4a4b31713faf7c7161428d7bd91. The ASCII encoding of dust contamination in hexadecimal notation is 6475737420636f6e74616d696e6174696f6e.