The term self-propelling is identified in base64 scheme by the sequence c2VsZi1wcm9wZWxsaW5n, while the MD5 signature is equal to 1518b96eb8adc086d2b2be541e402ba4. The ASCII encoding of self-propelling in hexadecimal notation is 73656c662d70726f70656c6c696e67.