11-02-2011, 04:27 PM
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| | Encrypted ipd file
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Few years ago, I developed an application to parse IPD file and upload to an internal site for backup. Now I need support the encrypted IPD file.
I opened and looked the encrypted ipd file, the structure is different with the original one.
I searched on internet, not enough information there, it just mentioned that the encryption used AES 256bits with CBC mode.
But the questions I have are:
. What's the structure of encrypted ipd file. It seems like the encryption is not based on the whole file.
. Since it is password based encryption, the key requires 32 bytes, hows the key composed (password + ????)
. What's the initial vector used for encryption?
. What's padding? is it Nopadding? I guess so, since the encrypted IPD file is just a little bit bigger than the original one
Can anyone answer these questions?