The term convexo-concave is identified in base64 scheme by the sequence Y29udmV4by1jb25jYXZl, while the MD5 signature is equal to c9fd43b0a55958168d4c21ec9e8eecaf. The ASCII encoding of convexo-concave in hexadecimal notation is 636f6e7665786f2d636f6e63617665.