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zardus committed Sep 29, 2024
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2 changes: 1 addition & 1 deletion cryptography/aes-cbc-poa/DESCRIPTION.md
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So you can manipulate the padding...
If you messed up somewhere along the lines of the previous challenge and created an invalid padding, you might have noticed that the worker _crashed_ with an error about the padding being incorrect!

It turns out that this one crash _completely_ breaks the Confidentiality of the AES-CBC cryptosystem.
It turns out that this one crash _completely_ breaks the Confidentiality of the AES-CBC cryptosystem, allowing attackers to decrypt messages without having the key.
Let's dig in...

Recall that PKCS7 padding adds N bytes with the value N, so if 11 bytes of padding were added, they have the value `0x0b`.
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