The term visually challenged is identified in base64 scheme by the sequence dmlzdWFsbHkgY2hhbGxlbmdlZA==, while the MD5 signature is equal to 91091b7094117f90a41eb9054a5940bb. The ASCII encoding of visually challenged in hexadecimal notation is 76697375616c6c79206368616c6c656e676564.