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### Quadruple DES vs AES-128 security

I came across this question regarding the security of Quadruple DES (hypothetically DES done four times) in CBC encryption mode vs security of AES-128 in CBC encryption mode. What parameters help to ...
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### Triple DES with 2 keys

Suppose triple DES is performed by choosing two keys $K_1$ and $K_2$ and computing $C = T (T (T (L, K_1), K_2), K_2)$. How to attack this modified version with a meet-in-the-middle attack, in which ...
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### How much would this AES modification improve security? [closed]

How much would using AES-CTR like 3DES improve security? Like so (Using a 512-bit key split into two; $K_1$ & $K_2$, and seperate nonces for all stages): ...