The Industrial Signature Interoperability Specifications (ISIS) define the message and file formats for services under the Signature Act(SigG). ISIS file formats include those for digital certificates, time stamps, and directory services.
The ISIS specifications were defined by the German Federal Office for Information Security( BSI) in cooperation with the Trust Center for Digital Signatures (AGTC) working group. They are intended to support medium-sized companies in implementing an information security management system( ISMS) in accordance with ISO 27001. To facilitate this approach, ISIS12 documented a procedure consisting of twelve iterative steps. Among the recommendations contained therein are the creation of guidelines, the attunement of employees, the establishment of a security team, the documentation of measures, and many others.