The term uncontaminated is identified in base64 scheme by the sequence dW5jb250YW1pbmF0ZWQ=, while the MD5 signature is equal to 9d4ef1f8f00ea6be5836ccbcda6c7dfb. The ASCII encoding of uncontaminated in hexadecimal notation is 756e636f6e74616d696e61746564.