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fix typo in archiver

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Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>
This commit is contained in:
Julien CLEMENT 2024-04-15 10:46:52 +02:00
parent af328857d7
commit 35e083d2d3
1 changed files with 3 additions and 5 deletions
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jujure/content/writeups/fcsc_2024/archiver.md
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@ -290,7 +290,7 @@ Remember that I know that filename is `flag.txt`, and that I have
an associated ciphertext. an associated ciphertext.
With a little bit of luck, the IV of the filename cipher text With a little bit of luck, the IV of the filename cipher text
is generated with the key: is generated with the same key:
```console ```console
>>> 0x82 ^ ord('f') >>> 0x82 ^ ord('f')
@ -299,10 +299,8 @@ is generated with the key:
Looks like it does. Looks like it does.
Since I have a known plaintext, example cipher text. Since I have a known plaintext and example cipher text, I can simply, xor
the plaintext with the filename IV to recover the xor key.
I can simply, xor the plaintext with the filename IV to recover
the xor key.
Then apply the same key to the file data IV to recover the Then apply the same key to the file data IV to recover the
plain text: plain text: