The term lettre de cachet is identified in base64 scheme by the sequence bGV0dHJlIGRlIGNhY2hldA==, while the MD5 signature is equal to 7afc28c85b7068e1f5ff90d6165cee82. The ASCII encoding of lettre de cachet in hexadecimal notation is 6c657474726520646520636163686574.