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Swetha Kiran NallamothuSwetha Kiran Nallamothu 

***Official Announcement/Reminder: HTTPS Security Certificate Change from SHA-1 to SHA-256 hash algorithms

Following security best practices and industry-wide changes, Salesforce will be updating all HTTPS security certificates to new certificates with a SHA-256 hash algorithm.

We are asking all customers to be prepared for this change by:
April 1, 2015 for Sandboxes
August 1, 2015 for all Instances

We will begin changing certificates in a phased approach shortly after these dates. Exact dates will be provided in March 2015.

There is a chattergroup for customers to interact with us to ask us questions here:
https://success.salesforce.com/_ui/core/chatter/groups/GroupProfilePage?g=0F9300000001oAF

For more information, see this Knowledge Article:
https://help.salesforce.com/apex/HTViewSolution?urlname=HTTPS-Security-Certificate-Switch-from-SHA-1-to-SHA-256-hash-algorithms&language=en_US (https://help.salesforce.com/apex/HTViewSolution?urlname=HTTPS-Security-Certificate-Switch-from-SHA-1-to-SHA-256-hash-algorithms&language=en_US)
PratikPratik (Salesforce Developers) 
Thanks for sharing. 

Key dates:
April 1, 2015 for Sandboxes
August 1, 2015 for all Instances

regards,
Pratik