Security News > 2016 > August > Collision Attacks Against 64-Bit Block Ciphers (Schneier on Security)

We've long known that 64 bits is too small for a block cipher these days. That's why new block ciphers like AES have 128-bit, or larger, block sizes. The insecurity of the smaller block is nicely illustrated by a new attack called "Sweet32." It exploits the ability to find block collisions in Internet protocols to decrypt some traffic, even through...

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https://www.schneier.com/blog/archives/2016/08/collision_attac.html