Hi,
1. Does Adobe Analytics offer ‘ring fenced solution’?
I am not sure if this covers what you are looking for, but you can control right down to the metric and dimension levels what users can see... in your Admin panel you can create user groups with various permissions, and if a user hasn't been granted access to see certain information, they can't access it.
2. Can we reduce the data retention period?
The data retention policy should be configurable in your contract... most users want more data so that is built in, but I don't see why if you need to reduce the length of time that it would be a problem... you just need to work with your Customer Success Manager and Support to set this as needed.
3. Can we set up our SSL/TLS certificate and set the cipher security level to high?
You don't have to have Adobe manage your tracking server... this is a service they provide, but you are more than welcome to set up your own server and SSL... you just need to point that server to the DNS that Adobe provides.... I can't see there being an issue with the level of security that you are looking for, but ClientCare would be better able to answer that than I can...
4. Can we enable IP obfuscation?
Yes, this is a setting at the suite level... I've not used it myself.. but maybe someone here has... but it's part of the initial setup, and can be turned on at any time.