5 ms·
Nope. DES also used 56 bit keys. It was crackable by the NSA the moment it was introduced in 1975. And by the 2000s, anyone could crack it. Even back then, th
by codesushi42 7y ago
Nope.
DES also used 56 bit keys. It was crackable by the NSA the moment it was introduced in 1975. And by the 2000s, anyone could crack it.
Even back then, the choice of 56 bits had nothing to do with speed. Chips were more than capable of handling 128 bit keys even in 1975. It's 2019 and we're still proposing 56 bit key lengths? Wow.
- clort 7y agoNo, they are not proposing 56 bit key lengths. I understand the key is always 128 bits. They are saying that the entropy should be minimum of 56 bits. In fact the entropy is always 128 bits but this negotiation reduces it because 'some' governments didn't want other governments to have stronger encryption. See [1] page 1050, figure 2. I don't know how much difference that makes (I am not an encryption expert), but it is a fact that affects your comparison to DES. [1] https://www.usenix.org/system/files/sec19-antonioli.pdf https://www.usenix.org/system/files/sec19-antonioli.pdf edit: citation
- codesushi42 7y agoI understand the key is always 128 bits. No, the article is about KNOB, which allows the attacker to arbitrarily shorten key length. The proposed solution is to have a minimum 56 bit key length, which is still too short.
- cryptonector 7y agoWas DES crackable by the NSA way back when? Are they known to have had the necessary HW?