Documentation and classification in ISO 27001

Answer:
I am not sure what you mean with your first question, but ISO 27001:2013 has the point 7.5 Documented information, where defines basic principles to manage documents and registers.

This article can be interesting for you “Document management in ISO 27001 & BS 25999-2” : https://advisera.com/27001academy/blog/2010/03/30/document-management-within-iso-27001-bs-25999-2/

Regarding the top secret documents, the best way to send them to another party, is to encrypt the information, and for this you can use various open source tools (and free). By the way, this article about the classification of information according to ISO 27001 can be also interesting for you “Information classification according to ISO 27001” : https://advisera.com/27001academy/blog/2014 /05/12/information-classification-according-to-iso-27001/

Finally, these materials will help you to learn more about ISO 27001 and the classification of information:
- free online training ISO 27001 Foundations Course https://advisera.com/training/iso-27001-foundations-course/
- book Secure & Simple: A Small-Business Guide to Implementing ISO 27001 On Your Own https://advisera.com/books/secure-and-simple-a-small-business-guide-to-implementing-iso-27001-on-your-own/