The term calling into question is identified in base64 scheme by the sequence Y2FsbGluZyBpbnRvIHF1ZXN0aW9u, while the MD5 signature is equal to 03bf19a93dcbeb49afaf8ccd3d1313b2. The ASCII encoding of calling into question in hexadecimal notation is 63616c6c696e6720696e746f207175657374696f6e.