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February 23, 2017

Google Announces Full SHA-1 Collision: What It Means

Today Google announced the first public full SHA-1 collision, i.e. the first pair of distinct values that when hashed with the SHA-1 function produce the same digest. This should not come as a surprise – it follows the free-start collisions announced at the end of 2015, and many cryptographers had been anticipating full SHA-1 collisions imminently.

To understand what this means, it helps to look at what happened after collisions were found in the MD5 hash function.

Continue reading →

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