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Nikita2022-02-13 23:10:33

AES: Is it possible to find out the key by knowing the original block and the encrypted block?

There was a following question. There is a block of **128** bits, it is encrypted with the **AES128** algorithm . Is it possible, knowing the contents of the original block and the encrypted block, to find out the key / simplify its selection?

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@gth-other

No.

It is possible, but not much.

It was a long time ago, but older versions of WinRAR used just AES 128.

We studied a similar issue in the context of our tasks (there is in the profile, if you're interested). Then, EMNIP came to the conclusion that if there is an encrypted archive and one or more unencrypted files from it, the algorithm, roughly speaking, is simplified to "AES_[about_hundred]".

It turned out, in my opinion, conditionally in the spirit of AES104 or AES108, the details have already disappeared over the years.

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Zettabyte, 2022-02-14 @gth-other

AES128. Is it possible, knowing the contents of the original block and the encrypted block, to find out the key

No.

make selection easier?

It is possible, but not much.

It was a long time ago, but older versions of WinRAR used just AES 128.

We studied a similar issue in the context of our tasks (there is in the profile, if you're interested). Then, EMNIP came to the conclusion that if there is an encrypted archive and one or more unencrypted files from it, the algorithm, roughly speaking, is simplified to "AES_[about_hundred]".

It turned out, in my opinion, conditionally in the spirit of AES104 or AES108, the details have already disappeared over the years.

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