Sponsored By

Google Researchers 'Shatter' SHA-1 Hash

'Collision' attack by researchers at CWI Institute and Google underscores need to retire SHA-1.

Dark Reading Staff

February 23, 2017

1 Min Read

The aging cryptographic hash function SHA-1 (Secure Hash Algorithm 1) has suffered what some experts consider its final blow today as researchers from Google and the CWI Institute revealed that they had found a practical way to break SHA-1.

SHA-1 long has been considered obsolete, and most major browser vendors plan to halt accepting SHA-1 based certificates this year due to its relatively weaker crypto scheme than the newer SHA-2 and SHA-3 standards. 

Google and CWI engineered a collision attack against SHA-1, demonstrating two PDF files with the same SHA-1 hash and different content as a proof-of-concept of their findings.

"For the tech community, our findings emphasize the necessity of sunsetting SHA-1 usage. Google has advocated the deprecation of SHA-1 for many years, particularly when it comes to signing TLS certificates. As early as 2014, the Chrome team announced that they would gradually phase out using SHA-1. We hope our practical attack on SHA-1 will cement that the protocol should no longer be considered secure," Google said in a blog post today. "We hope that our practical attack against SHA-1 will finally convince the industry that it is urgent to move to safer alternatives such as SHA-256."

See Google's post here for more details on the PoC.

 

About the Author(s)

Dark Reading Staff

Dark Reading

Dark Reading is a leading cybersecurity media site.

Keep up with the latest cybersecurity threats, newly discovered vulnerabilities, data breach information, and emerging trends. Delivered daily or weekly right to your email inbox.

You May Also Like


More Insights