The term circle of curvature is identified in base64 scheme by the sequence Y2lyY2xlIG9mIGN1cnZhdHVyZQ==, while the MD5 signature is equal to abc557a90067d104c2b1bd4305d5cfc1. The ASCII encoding of circle of curvature in hexadecimal notation is 636972636c65206f6620637572766174757265.