The latest news and insights from Google on security and safety on the Internet
![Announcing the first SHA1 collision](https://cdn-ak-scissors.b.st-hatena.com/image/square/6571391198fcb45e4d7c5cab7d90e5ca2fbf4605/height=288;version=1;width=512/http%3A%2F%2F2.bp.blogspot.com%2F-7bZ5EziliZQ%2FVynIS9F7OAI%2FAAAAAAAASQ0%2FBJFntXCAntstZe6hQuo5KTrhi5Dyz9yHgCK4B%2Fs1600%2Fgooglelogo_color_200x200.png)
We have broken SHA-1 in practice. This industry cryptographic hash function standard is used for digital signatures and file integrity verification, and protects a wide spectrum of digital assets, including credit card transactions, electronic documents, open-source software repositories and software updates. It is now practically possible to craft two colliding PDF files and obtain a SHA-1 digita
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