Discover Cryptography News
Google accelerates end of SHA-1 support; certificate authorities nervous
Google's recent announcement that they will begin to deprecate support for SHA-1 TLS/SSL digital certificates in Chrome is meeting resistance from certificate authorities (CAs). Google made their announcement on August 20 on their Security-dev mailing list, although they had been warning of this decision for months.
SHA-1 is a hash algorithm, a critical component of secure cryptography. A hash algorithm takes a block of data as input and outputs a value of a certain size (SHA-1 hashes are 160 bits long). This value is called a hash or digest. With a good hash algorithm, two different blocks of data will always produce a different hash, and even a small change in the input data will result in a significant change in the output. There should be no way to learn anything about the input data from the hash output.
The link for this article located at ZDNet Blogs is no longer available.