The term case-hardened steel is identified in base64 scheme by the sequence Y2FzZS1oYXJkZW5lZCBzdGVlbA==, while the MD5 signature is equal to f66c47c7461f772f3b66dc48a01630e1. The ASCII encoding of case-hardened steel in hexadecimal notation is 636173652d68617264656e656420737465656c.