The term natural immunity is identified in base64 scheme by the sequence bmF0dXJhbCBpbW11bml0eQ==, while the MD5 signature is equal to 48de5bde5964f9b56d7be9af9e9bd41b. The ASCII encoding of natural immunity in hexadecimal notation is 6e61747572616c20696d6d756e697479.