Pad Practice

We found blockciphers and cookies to be the perfect solution for our session management needs. The only problem we heard about was some kind of "oraculum", so we decided to pad our messages with NUL bytes and now the system is 100% safe.

Update (2019-01-02): fixed a typo in the flag

You get 200 points for this challenge.

Solvers: no one

2019 web crypto

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