TAMUctf-2019 Crypto
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描 述: The password to the AES256-CBC encrypted file is the shared key in the ECDH key exchange. It is the string representation of the x coordinate concatenated with the y coordinate of the shared key. Example: shared key: (12345,67890) password: 1234567890 Mike forgot to include the order of the points on the curve in his homemade certificates. Mike, the System Administrator, thought it would be a good idea to implement his own Elliptic Curve Diffie Hellman key exchange using unnamed curves to use across the network. We managed to capture TCP traffic of the unencrypted key exchange along with an encrypted file exchange. See if you can read the contents of that file.
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