Large data transfer using visual codes with feedback confirmation
A method of confirming receipt, including iteratively capturing by a receiving device visual codes in a series of visual codes displayed on a sending device. A corresponding captured visual code being from a display block that resulted from a partition of an original data file into display blocks, and wherein each display block is converted to a corresponding string and header including an ordered identifying display block number and a total count of the display blocks. Each corresponding string is converted to a corresponding visual code. Each of the captured visual codes is converted into a corresponding string and a header is read for the corresponding string. Captured display blocks are determined. A confirmation message is generated including information indicating which display blocks have been received. The confirmation message is sent over a wireless communication link to the sending device to reduce the number of visual codes being displayed.
1. A method, comprising:
receiving a series of visual codes of a first original data file from a sending device, wherein the first original data file and a first digitally signed hash value of the first original data file are partitioned into a first series of display blocks and wherein each display block from the first series of display blocks includes a corresponding header that includes an ordered identifying display block number and a total count of the display blocks in the first series of display blocks, wherein each display block from the first series of display blocks is converted to a byte array to define a first series of byte arrays, wherein each byte array in the first series of byte arrays is converted to a corresponding visual code to define the series of visual codes;
converting a set of visual codes from the series of visual codes into a second series of byte arrays;
converting the second series of byte arrays into a second series of display blocks, wherein each display block in the second series of display blocks includes a corresponding header that includes an ordered identifying display block number and a total count of the display blocks in the second series of display blocks;
coalescing the second series of display blocks into a second original data file and a second digitally signed hash value of the second original data file using an order determined by the ordered identifying display block number in the header of each display block in the second series of display blocks, wherein the second original data file is the same as the first original data file and the second digitally signed hash value of the second original data file is the same as the first digitally signed hash value of the first original data file; and
verifying the second original data file with the second digitally signed hash value of the second original data file.
2. The method of claim 1 , further comprising:
verifying integrity of the second original data file using a seal that is accessed from a block chain database storing the seal, the seal generated based on contents of the first original data file; and
verifying validity of the second original data file using a certification accessed from a block chain database storing the certification, the certification generated based on contents of the first original data file and the seal, wherein the verifying integrity and the verifying validity are performed by an image-capturing device.
3. The method of claim 1 , further comprising:
determining that the second series of display blocks is complete, based on the ordered identifying display block number and the total count of the display blocks in the header of each display block in the second series of display blocks; and
stopping the capturing of visual codes.
4. The method of claim 1 , wherein each byte array in the first series of byte arrays is a string.
5. The method of claim 1 , further comprising:
decrypting the second original data file and the second digitally signed hash value of the second original data file using a private key, wherein the first original data file and the first digitally signed hash value of the first original data file are encrypted using a public key corresponding to the private key.
6. The method of claim 1 , wherein the method is performed by a receiving device without network connectivity to the sending device.
7. The method of claim 1 , wherein the first original data file includes a timestamp.
8. The method of claim 1 , wherein the first original data file includes an image file.
9. The method of claim 1 , wherein the first original data file includes biometric data of a user of the sending device.
10. A non-transitory computer-readable medium storing a computer program performing a method, the computer-readable medium comprising:
program instructions for receiving a series of visual codes of a first original data file from a sending device, wherein the first original data file and a first certificate from a certifying entity are partitioned into a first series of display blocks and wherein each display block from the first series of display blocks includes a corresponding header that includes an ordered identifying display block number and a total count of the display blocks in the first series of display blocks, wherein each display block from the first series of display blocks is converted to a byte array to define a first series of byte arrays, wherein each byte array in the first series of byte arrays is converted to a corresponding visual code to define the series of visual codes;
program instructions for converting a set of visual codes from the series of visual codes into a second series of byte arrays;
program instructions for converting the second series of byte arrays into a second series of display blocks, wherein each display block in the second series of display blocks includes a corresponding header that includes an ordered identifying display block number and a total count of the display blocks in the second series of display blocks;
program instructions for coalescing the second series of display blocks into a second original data file and a second certificate using an order determined by the ordered identifying block number in the header of each display block in the second series of display blocks, wherein the second original data file is the same as the first original data file and the second certificate is the same as the first certificate; and
program instructions for verifying the second original data file with the second certificate.
11. The non-transitory computer-readable medium of claim 10 , further comprising:
program instructions for verifying integrity of the second original data file using a seal that is accessed from a block chain database storing the seal, the seal generated based on contents of the first original data file; and
program instructions for verifying validity of the second original data file using a certification accessed from a block chain database storing the certification, the certification generated based on contents of the first original data file and the seal, wherein the verifying integrity and the verifying validity are performed by an image-capturing device.
12. The non-transitory computer-readable medium of claim 10 , further comprising:
program instructions for determining that the second series of display blocks is complete, based on the ordered identifying display block number and the total count of the display blocks in the header of each display block in the second series of display blocks; and
program instructions for stopping the capturing of visual codes.
13. The non-transitory computer-readable medium of claim 10 , wherein each byte array in the first series of byte arrays is a string, the first series of byte arrays is a first series of strings, and the second series of byte arrays is a second series of strings.
14. The non-transitory computer-readable medium of claim 10 , wherein the first certificate from the first certifying entity includes a digitally signed hash value of the first original data file.
15. The non-transitory computer-readable medium of claim 10 , wherein the computer-readable medium further comprises program instructions for verifying the second original data file with a copy of the first original data file obtained from the certifying entity.
16. A computer system comprising:
a processor; and
memory coupled to the processor and having stored therein instructions that, if executed by the computer system, cause the computer system to execute a method comprising:
receiving a series of visual codes of a first original data file from a sending device, wherein the first original data file is partitioned into a first series of display blocks, each display block from the first series of display blocks includes an indication of a previous display block in the first series of display blocks, wherein each display block from the first series of display blocks is converted to a byte array to define a first series of byte arrays, each byte array in the first series of byte arrays is converted to a corresponding visual code to define the series of visual codes;
converting a set of visual codes from the series of visual codes into a second series of byte arrays;
converting the second series of byte arrays into a second series of display blocks, each display block in the second series of display blocks includes an indication of a previous display block in the second series of display blocks;
verifying integrity of the second series of display blocks by comparing the indication of the previous display block for each display block in the second series of display blocks with a previous display block in the second series of display blocks; and
coalescing the second series of display blocks into a second original data file, the second original data file is the same as the first original data file.
17. The method of claim 16 , further comprising:
verifying integrity of the second original data file using a seal that is accessed from a block chain database storing the seal, the seal generated based on contents of the first original data file; and
verifying validity of the second original data file using a certification accessed from a block chain database storing the certification, the certification generated based on contents of the first original data file and the seal, wherein the verifying integrity and the verifying validity are performed by an image-capturing device.
18. The computer system of claim 16 , wherein each byte array in the first series of byte arrays is a string, the first series of byte arrays is a first series of strings, and the second series of byte arrays is a second series of strings.
19. The computer system of claim 16 , wherein each indication of the previous display block in the first series of display blocks is a hash value of a previous display block in the first series of display blocks and each indication of the previous display block in the second series of display blocks is a hash value of a previous display block in the second series of display blocks.
20. The computer system of claim 16 , wherein the computer system is without network connectivity to the sending device.