SMS spoofing and attacks are technically possible (although they are very minimal in practice today) and posting to google+ by sms is going to be of no exception.
In order to protect and secure your sms posting, google+ supports security PIN number to be included part of your post which provides that extra layer of security.
A google+ SMS pin must be
- 4 to 8 alpha numeric characters
- allowed characters are A-Z and 0-9
- pin’s are case sensitive
How to setup a sms pin?
Just head to google+ settings and look under notification delivery section a setting called Add SMS security PIN (refer image above)
How to use the pin?
The pin must be first thing in the google+ sms post right before the post content and the circle or individual email addresses
SMS post example with a security pin
ABCD1234 This is a sample google+ sms test post +circlename
here ABCD1234 is the secure pin setup using google+ settings (refer image above)
Add a SMS pin to your google+ account and enjoy that peace of mind while posting by sms.