New answers tagged

10

As you specifically asked for comparisons of the 128-bit security with concrete things, here is some food for thoughts (to complement the other answers): $2^{61} ≈$ SHA-1 chosen-prefix collision (i.e. definitively practical) from the recent SHA-mbles attack. $2^{63} ≈$ the initial SHA-1 collision from SHAttered attack (which ran over multiple months). (i.e. ...


8

The current recommendations of the BSI recommend 120 bit of security beyond 2022. And AES 128 is still in their recommendations. If the current estimate of AES128 is about 126.1 bits of security, that's still above the threshold. And AES has been subject to a lot of cryptanalysis for many years, so that estimate seems quite strong. For crypto with keys, ...


24

I strongly disagree with saying that AES-128 is broken, in any way, shape or form, and likewise ECC with 256-bit keys. Note that even in this answer by @kelaka regarding AES-128, you would need over 34 million years of the entire bitcoin mining power to carry out a computation of $2^{128}$. This is far from broken. If quantum computers ever happen at scale, ...


Top 50 recent answers are included