Abstract: Provided is an electronic cash-based offline transaction method and system. The method includes: receiving, by a back-end server from a smart card, an anti-replay factor generated by the smart card; determining, by the back-end server in accordance with a predetermined algorithm, whether an abnormal transaction occurs on the smart card, generating, by the back-end server when no abnormal transaction occurs, a security information signature by signing security information with a private key of the back-end server, and transmitting, by the back-end server, the security information and the security information signature to the smart card (S2).

Abstract: A method for transmitting data by using a power line. The method includes: setting i=1 and j=1; receiving an i-th zero crossing signal at a time point ti, and determining, based on the i-th zero crossing signal, a start time when synchronization signals of a j-th data packet are transmitted, the start time when the synchronization signals of the j-th data packet are transmitted being ti+t; transmitting the synchronization signals of the j-th data packet at the start time when the synchronization signals of the j-th data packet are transmitted; transmitting data signals of the j-th data packet in sequence; and determining whether j is equal to M; when j is not equal to M, continuing a data transmission; and when j is equal to M, ending the data transmission, M being a number of data packets into which data to be transmitted is divided.

Abstract: The present disclosure provides a data transmission method and apparatus. The method includes: obtaining to-be-transmitted data; putting the to-be-transmitted data into a to-be-transmitted data field with a fourth predetermined number of Bytes in a first predetermined frame format for encapsulation, to obtain a to-be-transmitted data frame, the first predetermined frame format sequentially including a first permeable field, a frame synchronization signal field, an address field, the to-be-transmitted data field, a check field, a first postamble field, and a first predetermined gap field; encoding and modulating the to-be-transmitted data frame in accordance with BPSK, and then transmitting the to-be-transmitted data frame; and demodulating and decoding in accordance with the BPSK to obtain an ACK signal.

Abstract: Offline electronic currency payment and collection methods are provided. The payment method includes: establishing, by a first device, a wireless connection with a peer device, acquiring wallet information, and transmitting the wallet information to a first peer device without deleting stored electronic currency; and receiving collection information, verifying that first peer offline account information is not included in an offline transaction blacklist, acquiring first transaction information, digitally signing the first transaction information, transmitting first transaction data including signature data to the first peer device, and storing a first transaction record.

Abstract: Provided is a zero crossing point signal output method, including: continuously receiving zero crossing point square wave signals, and periodically sampling zero crossing point square wave signals at a predetermined sampling frequency; acquiring sampling numbers of 1st to Mth zero crossing point square wave signals to obtain an average sampling number S, and calculating a first zero crossing point interval T1; setting a zero crossing point signal output interval as the first zero crossing point interval T1; continuously outputting zero crossing point signals with an interval being the zero crossing point signal output interval; obtaining sampling numbers of M+1th to M+Nth zero crossing point square wave signals, calculating a difference value between each of the sampling numbers and S, and obtaining an accumulated difference value ?s through calculation; when ?s is not within a predetermined change range, obtaining a second zero crossing point interval T2 and setting the zero crossing point signal output inte

Abstract: A method and device for securely displaying data are displayed. The method includes the following. A security display state is entered after an instruction used for starting the security display state is received. A current data packet to be displayed is obtained. If a display address includes a security display address, security data corresponding to the security display address is obtained from current data to be displayed. The security data is securely processed. The security data is displayed at the security display address. A security processing result of the security data is obtained. The security display address is a fixed address.

Abstract: The present disclosure provides a security display method, a security display device, and a security terminal. The security display method includes the following. In a security display control state, first information to be displayed currently is obtained. It is determined whether the first information to be displayed includes a specified identifier. In response to the first information to be displayed includes the specified identifier, the security processing information is obtained by filtering the first information to be displayed based on the specified identifier, and the security processing information is securely processed. The security processing information is displayed at a security display address. The security display address is a preset fixed display address. Or, a security identifier is added to the security processing information to obtain security display information and the security display information is displayed.

Abstract: A method and a system for secure communication are provided, said method including: a first terminal sending a request message to a second terminal, initiating a first time counting according to a preset timing mode when finishing sending the request message (101); the second terminal receiving the request message, and obtaining a response message according to the request message (102); the first terminal sending a response notification message to the second terminal when a value of the first time counting reaches a first value, and initiating a second time counting according to a preset timing mode when finishing sending the response notification message (103); the second terminal receiving the response notification message, and sending a response message to the first terminal (104); the first terminal permitting starting to receive the response message when a value of the second time counting is within an effective threshold of a second value (105).

Abstract: A smart card, a method for outputting validation data, and a method for responding to an operation request are provided. The method for outputting validation data includes acquiring an operation request by a smart card; acquiring smart card operation information of the smart card by the smart card, after acquiring the operation request, wherein the smart card operation information comprises at least a smart card mode factor for indicating a working mode of the smart card, and the working mode of the smart card comprises a non-contact communication mode and/or a contact communication mode; acquiring a validation data generating strategy, and using the validation data generating strategy to process at least the smart card operation information to obtain validation data by the smart card; outputting the validation data by the smart card after obtaining the validation data.

Abstract: A method for obtaining a font map, a character display device and system, and an electronic signature token are provided. The method comprises: receiving a font map sent from a font map storage device with a character display device; calculating a check code of the font map sent from the font map storage device with the character display device; comparing the calculated check code of the font map with a locally stored check code corresponding to the font map by the character display device, and if the two check codes are consistent, determining by the character display device that the font map sent from the font map storage device is correct.

Abstract: The present invention provides a data transmitting circuit, a data receiving circuit and a data transferring apparatus. In one of the implementations of the data transmitting circuit, the first end of the primary coil of a transformer is connected to a first power supply interface, and the second end of the primary coil of the transformer is connected to the first end of a current limiting module and the first end of a first capacitor respectively; the first end of the secondary coil of the transformer is connected to a second power supply interface, and the second end of the secondary coil of the transformer is connected to a transmitting interface; the second end of the current limiting module and the second end of the first capacitor are both connected to the input end of a switch module.

Abstract: The present disclosure relates to a data communication method and system. The method includes: a first terminal continuously generating a communication carrier signal; sending by the first terminal a communication data signal carrying a data packet to be processed, beginning to record the first number of pulses when the first terminal completes sending the data packet to be processed; receiving by the second terminal the communication data signal, beginning to record the second number of pulses when the second terminal completes receiving the data packet to be processed, generating a response data packet sending, by the second terminal, the response data packet to the first terminal when detecting that the second number reaches a pulse number threshold N; and allowing, by the first terminal, to begin receiving the response data packet when detecting that the first number is within a threshold range.

Abstract: A signal responding method includes: receiving a carrier signal with a frequency of 125 KHz via an antenna with a resonance frequency of 13.56 MHz; amplifying the carrier signal and performing analog-to-digital conversion on the amplified carrier signal to obtain a digital signal; acquiring, according to the digital signal, a signal characteristic of the carrier signal which comprises at least a frequency and a phase; and encoding response data at the frequency of the carrier signal to obtain an encoded signal, determining an initial phase to output the encoded signal based on the phase of the carrier signal, and outputting the encoded signal via the antenna, such that the encoded signal and the carrier signal are superposed at a same phase.

Abstract: A payment method and a payment system are disclosed. After a biological body enters a predetermined range of a payee device, a communication connection is established by a payee device with a payer device through the biological body, and transaction information is transmitted to the payer device. The transaction information is received by the payer device, key information is extracted and is prompted, and authentication information is transmitted to the payee device after receiving a confirmation instruction. The authentication information is received by the payee device and biological feature information about the biological body is acquired during a time duration when the biological body is within the predetermined range. An authentication result for authenticating the digital authentication information and the biological feature information is acquired by the payee device, and payment transaction is performed when the authentication result is a successful authentication.

Abstract: The present disclosure provides a data communication device and a data communication system. The data communication device includes a power supply interface coupled to a direct current power supply, a wired communication interface, a main control chip, and an energy storage component. The data communication system includes a master communication device and a slave communication device.

Abstract: The present disclosure provides an authorization authentication method, apparatus and system.

Abstract: A data processing method and device, and a POS transaction system are provided. The method includes the following. Card information pre-stored in a chip card transacting with the POS terminal is read. The card information includes information of a program set for processing transaction data of the chip card. One or more transaction programs matching with a current transaction are acquired in the program set according to the card information. The one or more transaction programs run to calculate and transmit transaction data of the current transaction.

Abstract: The virtual machine includes a receiving module, an instruction assigning module, a downloading module, an application registry maintenance module, a state switching module, a storage managing module, and a communication module. The state switching module is configured to in response to determining that it is required to move the code segment, allocate a storage space of the off-chip FLASH for the code segment of the application to be loaded, acquire a second base address of the code segment of the application to be loaded, and modify the current running address as the second base address. The off-chip FLASH is configured to store the code segment of the application to be loaded on the off-chip FLASH.

Abstract: A method and a device for keeping an active state of a smart card until re-entering a field, and a smart card are provided. The method includes: sending a waiting time extension instruction by a smart card to an electronic device when the smart card is in an electromagnetic field of the electronic device and in an active state; starting a timer after the smart card receives a reply in response to the waiting time extension instruction; detecting that the smart card leaves the field, determining whether the timer times out, and keeping a current state of the smart card as the active state when the timer does not time out and detecting that the smart card re-enters the field, determining whether the timer times out, and keeping the current state of the smart card as the active state when the timer does not time out.

Abstract: A communication device, an adapter device and a communication system (100) are provided. The system (100) includes: a master communication device (10) and a slave communication device (20), the master communication device (10) includes: a first external interface (130) including a first pin (131) and a second pin (132), and a signal generating module (110) electrically connected to the first pin (131); the signal generating module (110) is configured to generate X signals according to time interval corresponding to an N-bit string to be sent, in which the time interval corresponding to the N-bit string to be sent represents time interval between start times of each two adjacent signals, different time intervals corresponding to different bit strings, where N?1, X?1 and X is a natural number; said first external interface (130) is congured to send said X signals through the first pin (131).