The invention discloses a novel offline
payment method. The method comprises the steps that account numbers of an accountee party and a receiving party serve as IDs, and a corresponding public key and private key are mapped according to business sub-domain identifications; a random number is selected from the receiving party, signature is conducted on the random number through the private key, and a two-dimension code is generated; the two-dimension code is scanned through the accountee party, the public key is mapped by means of the receiving party ID and the service sub-
domain identification, and attestation is conducted on a signing message; if attestation succeeds, the accountee party successfully pays according to transaction information; signature is conducted on the random number by the accountee party through the private key after
payment to generate a two-dimension code; the receiving party scans the two-dimension code, the public key is mapped through the accountee party ID and the business sub-
domain identification, and attestation is conducted on a signing message; if attestation succeeds, posting is successfully conducted on the receiving party. According to the novel offline
payment method, payment does not rely on the support of a network any more, payment is achieved on various mobile equipment, and the payment process is greatly facilitated. The two-way
authentication process based on the identifications is adopted by the two payment parties, the legality of transactions is fully guaranteed, and illegal manipulation of information and information disguising are prevented.