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Atomic cloud storage
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== Forming the download contract: == # The renter and the farmer build an ECDSA key pair and exchange hashes of the public keys. # They then reveal the public keys for the corresponding hashes. # The public keys are added together using elliptic curve addition. # This results in a new ECDSA public key whose private key can only be found by adding together both private keys from the renter and farmer. # The renter generates an AES private key and encrypts their content with that. # The renter uploads the resulting ciphertext to the farmer. # The farmer and the renter encrypt their copy of the ciphertext (producing a new ciphertext) with the additive key from step 3. This can be done with something like ElGamal [8]. # The farmer gives back the SHA 256 hash of the resulting ciphertext. # The renter checks the hash matches the hash of their own “ECDSA encrypted” content and saves a copy of the hash. # If the content matches their hash – the renter makes a payment to a special Bitcoin address that requires the Farmer to reveal their private key from step 1 (details given later) to spend the coins. <span id="to-download-a-file-the-process-looks-like-this-9-10"></span>
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