oconnor663 / applied_crypto_2021_fall Goto Github PK

hardcoding anything in the solution seems like cheating. perhaps the grading environment can pass the (absolute) filepaths of the shattered pdfs as input. Example json can be updated with:

-  "problem4": null,
+  "problem4": [
+    "shattered-1.pdf",
+    "shattered-2.pdf"
+  ],

(note the lack of / for windows compatibility. by default open() should read in current working dir anyway.

I thought in class we discussed that even in CTR mode, the nonce component (first 12 bytes) need to be completely random. Otherwise if it does not contain random bits the random "stream" will not be very random therefore breaking CTR completely.

Maybe the "unique" word is confusing me in:

Or is it sufficient for it to be unique, like the CTR mode nonce?

Is that just my bad English over-reading this? Maybe clarify that a bit?