Cisco provides multiple options to upload information to the Cisco Technical Assistance Center (TAC) to fit customer’s different operating environments. Some of these options are less secure, leading to certain inherent risks. Each option has limitations that should be considered before deciding on an appropriate upload option. A document is available at the following link that describes the various file transfer mechanisms supported by the Cisco TAC and what are the benefits of using one method over the other:
http://www.cisco.com/web/about/security/intelligence/01_12_TAC_Uploads.html
"The preferred and most secure option is to use the TAC Service Request Tool (TSRT) Java client File Upload. Files transferred via this option are encrypted in transit and are size constrained to 50 GB. The communication channel between the customer’s computing device and Cisco is encrypted and the information is also immediately linked to the associated Service Request and stored in an encrypted format."
More information is available at the document.
