Facebook will require application developers to move later this year to a more secure type of digital signature for their apps, which is used to verify a program’s legitimacy.
As of Oct. 1, apps will have to use SHA-2 certificate signatures rather than ones signed with SHA-1. Both are cryptographic algorithms that are used to create a hash of a digital certificate that can be mathematically verified.
Apps that use SHA-1 after October won’t work on Facebook anymore, wrote Adam Gross, a production engineer at the company, in a
blog post.
