The term countermortar fire is identified in base64 scheme by the sequence Y291bnRlcm1vcnRhciBmaXJl, while the MD5 signature is equal to 57132cca44ca509c0fedb2b3d42f4096. The ASCII encoding of countermortar fire in hexadecimal notation is 636f756e7465726d6f727461722066697265.