python

3 posts

  1. crypto warmup

    3kCTF 2021 · crypto

    Mapping every three-character block to the number the provided encoder outputs, then reversing the lookup over the given numbers.Mapping every three-character block to the number the provided encoder outputs, then reversing the lookup over…

  2. babycrypto1

    LINECTF 2021 · crypto

    Forging an AES-CBC command block with the server's encryption oracle, encrypting the show command under the previous block as its IV.Forging an AES-CBC command block with the server's encryption oracle, encrypting the show command under the…

  3. babycrypto2

    LINECTF 2021 · crypto

    Flipping bits in the IV that the server prepends to AES-CBC ciphertext, so the first block decrypts to show instead of test.Flipping bits in the IV that the server prepends to AES-CBC ciphertext, so the first block…