Solution : https://service.sap.com/sap/support/notes/672421 (SAP Service marketplace login required)
Key words : 
higher number means higher security, ipc server side configuration related, ipc client side configuration related, higher additional security products, latest ipc server patch, service packs smaller, <server> </server> section, additional security features, secured rfc connections, ipc web-application
Related Notes : 
       
| 720523 | IPC security: Maintaining params for SSL secured connections | 
| 698181 | IPC security: Maintaining parameters for SNC-RFC connections | 
| 669883 | SCE: User entries for attribute with 'not ready for input' | 
| 658464 | Security check of IPC |