The term concavo-concave is identified in base64 scheme by the sequence Y29uY2F2by1jb25jYXZl, while the MD5 signature is equal to 7cb4ac74b80718a182b3a4caf680c027. The ASCII encoding of concavo-concave in hexadecimal notation is 636f6e6361766f2d636f6e63617665.