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[i] its supposed to be porn (the file)
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Hehe, I thought so. you need a public and private key. the encrypter has the private key and the one wanting to decrypt recieves the public key. The keys are created in a set, and the public one is distributed. hence you must have the ORIGINAL SENDERS public key. the file is passed through the public key, and it unlocks it, since its coded with the same code as the private key. this is meant for secure transmissions over PPTP. So without the original public key, your SOL.