The term unimpressionable is identified in base64 scheme by the sequence dW5pbXByZXNzaW9uYWJsZQ==, while the MD5 signature is equal to 8ef798a4eefe51b4e6400be527f25673. The ASCII encoding of unimpressionable in hexadecimal notation is 756e696d7072657373696f6e61626c65.