Abstract: A method and computer program product provide operations including obtaining first data encoded to form a first array of two-dimensional barcodes, obtaining second data encoded to form a second array of two-dimensional barcodes, and performing a forward mashup algorithm on the first array and second array to form a third array of two-dimensional barcodes, wherein, for each combination of column, row and ordinal position, a binary value in the first array and a binary value in the second array are input to a first Boolean algorithm to produce a binary value for the same combination of column, row and ordinal position in the third array. The operations further include publishing the third array of two-dimensional barcodes, wherein the second array of two-dimensional barcodes are necessary to regenerate the first array of two-dimensional barcodes so that the first data can be decoded.

Abstract: A method, apparatus and computer program product provide operations including accessing input data, dividing the input data into a sequence of data segments, where the sequence includes a specific number of data segments and an initial data segment, receiving a personal value from a second device, using an iterated mathematical function that uses the personal value and the sequence of data segments to generate a sequence of parameter values, transmitting the iterated mathematical function and the initial data segment to the second device through a first communication channel, and transmitting the sequence of parameter values to the second device through a second communication channel that is independent of the first communication channel. For example, the first communication channel may include a network connection and the second communication channel may be a line-of-sight optical channel.

Abstract: A method includes a first computer encoding input data into a sequence of two-dimensional barcodes, the first computer displaying an image of each of the two-dimensional barcodes on a display screen in sequential order, a second computer using an imaging device to capture each of the displayed images to obtain the sequence of two-dimensional barcodes, and the second computer decoding each of the two-dimensional barcodes to obtain the input data. Separately, a first computer may divide input data into a sequence of data segments, receiving a personal value from a second computer, and perform an iterated mathematical function that uses the personal value and the sequence of data segments to generate a sequence of parameter values. The first computer may then transmit the iterated function and the initial segment to the second computer through a first channel and transmit the parameter values to the second computer through a second channel.

Abstract: A method includes a first computer encoding input data into a sequence of two-dimensional barcodes, the first computer displaying an image of each of the two-dimensional barcodes on a display screen in sequential order, a second computer using an imaging device to capture each of the displayed images to obtain the sequence of two-dimensional barcodes, and the second computer decoding each of the two-dimensional barcodes to obtain the input data. Separately, a first computer may divide input data into a sequence of data segments, receiving a personal value from a second computer, and perform an iterated mathematical function that uses the personal value and the sequence of data segments to generate a sequence of parameter values. The first computer may then transmit the iterated function and the initial segment to the second computer through a first channel and transmit the parameter values to the second computer through a second channel.

Abstract: A computer program product includes a non-volatile computer readable medium and non-transitory program instructions embodied therein, the program instructions being configured to be executable by a processor to cause the processor to perform various operations. The operations may include obtaining first encoded data that encodes information of a first party, obtaining second encoded data that encodes information of a second party, performing a forward mashup algorithm on the first encoded data and second encoded data to form a third data set, and providing the third data set to the first party as a mashup two-dimensional barcode.