The term historical period is identified in base64 scheme by the sequence aGlzdG9yaWNhbCBwZXJpb2Q=, while the MD5 signature is equal to 21c82a58b31fdfb0d2c75c4ae2a69030. The ASCII encoding of historical period in hexadecimal notation is 686973746f726963616c20706572696f64.