The term castle in the air is identified in base64 scheme by the sequence Y2FzdGxlIGluIHRoZSBhaXI=, while the MD5 signature is equal to c8e61b2aa589e88e35f99540b29eec00. The ASCII encoding of castle in the air in hexadecimal notation is 636173746c6520696e2074686520616972.