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Arbitrated Quantum Digital Signature: Difference between revisions
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Like other QDS protocols, it is divided into two phases: Distribution (Key Generation, Signature Distribution) and Messaging (signing/verification). This scheme is presented between seller (one who signs the message), buyer (one whom the signed message is sent) and PKG (generates and distributes public-private key for seller) and a buyer.</br> | Like other QDS protocols, it is divided into two phases: Distribution (Key Generation, Signature Distribution) and Messaging (signing/verification). This scheme is presented between seller (one who signs the message), buyer (one whom the signed message is sent) and PKG (generates and distributes public-private key for seller) and a buyer.</br> | ||
* '''Key Generation''': In this step, PKG generates derives the public key of the seller and generates a private key which is secretly sent to Seller over insecure classical channel. Seller's public key is derived from her personal information such as her email-id over a public channel. A quantum one way function (QOWF) is chosen by PKG randomly and secretly, which uses the classical public key as its input. The quantum pre-shared common key (assumption) was used to one-time pad the outcome of QOWF into a cipher-text (secret text) using | * '''Key Generation''': In this step, PKG generates derives the public key of the seller and generates a private key which is secretly sent to Seller over insecure classical channel. Seller's public key is derived from her personal information such as her email-id over a public channel. A quantum one way function (QOWF) is chosen by PKG randomly and secretly, which uses the classical public key as its input. The quantum pre-shared common key (assumption) was used to one-time pad the outcome of QOWF into a cipher-text (secret text) using [[Arbitrated Quantum Digital Signature#References|Quantum Vernam Cipher (1), (2)]]. This cipher-text was communicated to seller (over insecure channel). Seller un-pads the cipher-text to obtain the outcome of QOWF using the pre-shared common key. Hence, everyone knows seller's public key and, only PKG and seller know her private key. | ||
* '''Signature''': In this step, the Signer generates a signature quantum state using the message they want send, their public and private keys. The Signer also selects a quantum one way function publicly to generate the quantum digest. | * '''Signature''': In this step, the Signer generates a signature quantum state using the message they want send, their public and private keys. The Signer also selects a quantum one way function publicly to generate the quantum digest. | ||
** The Signer selects two random strings and generates a quantum state of the message using these random strings. | ** The Signer selects two random strings and generates a quantum state of the message using these random strings. | ||