T. Pavlidis, J. Swartz, and Y. P. Wang. Information encoding with two--dimensional bar codes. Computer, 24(6):18--28, June 1992.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....must be easily printable by commodity or after market laser printers, it must be easily scanned and re digitized at a post office, and it must have sufficient information density to encode all the bits of the indicia on the envelope within a reasonable amount of space. Symbol Technologies PDF417 [26, 37, 38], for example, can encode 400 bytes per square inch, sufficient for cryptographic indicia. Figure 3 shows an example of PDF417 s density. Six lines of 40 full ASCII characters for each address, 6 four bytes each for hierarchical authorization number, a serial number for the software instance ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

....printed on an envelope as a 2 D barcode 4 . Such barcodes can be printed using commodity laser printers, and they can be scanned and re digitized at a post office. Several 2 D barcode technologies exist; figure 2 shows Lincoln s Gettysburg Address encoded in Symbol Technologies PDF417 barcode [5, 12, 13]. PDF417 can store 400 bytes per square inch. Central to the security of cryptographic indicia is checking indicia validity. Section 5 addresses this important issue. 5 Indicia Design What type of cryptographic signature algorithm should we use Most cryptographic signature algorithms require ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

....printed on an envelope as a 2 D barcode 4 . Such barcodes can be printed using commodity laser printers, and they can be scanned and re digitized at a post office. Several 2 D barcode technologies exist; figure 2 shows Lincoln s Gettysburg Address encoded in Symbol Technologies PDF417 barcode [5, 12, 13]. PDF417 can store 400 bytes per square inch. Central to the security of cryptographic indicia is checking indicia validity. Section 5 addresses this important issue. 5 Indicia Design What type of cryptographic signature algorithm should we use Most cryptographic signature algorithms require ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with twodimensional bar codes. Computer, 24(6):18--28, June 1992.

....laser printers, it must be easily scanned and re digitized at a post office, and it must have sufficient information density to encode all the bits of the stamp on the envelope within a reasonable amount of space. Appropriate technologies include Code49 [62] Code16K [43] and PDF417 [42, 65, 66]. Symbol Technologies PDF417, in particular, is capable of encoding at a density of 400 bytes per square inch, which is sufficient for the size of cryptographic stamps needed to provide the necessary security in the foreseeable future. Figure 3.3 shows the amount of information that can be ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

.... after market laser printers, it must be easily scanned and re digitized at a post office, and it must have sufficient information density to encode all the bits of the stamp on the envelope within a reasonable amount of space. Appropriate technologies include Code49[18] Code16K[12] and PDF417 [21, 20, 11]. Symbol Technologies PDF417, in particular, is capable of encoding at a density of 400 bytes per square inch, which is sufficient for the size of cryptographic stamps needed to provide the necessary security in the foreseeable future. Figure 2 demonstrates the amount of information that can be ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

....of some information, such as the postage value, and addresses. Figure 2: PDF417 barcode representation of The Gettysburg Address and re digitized at a post office. Several 2 D barcode technologies exist; figure 2 shows Lincoln s Gettysburg Address encoded in Symbol Technologies PDF417 barcode [3, 9, 10]. PDF417 can store 400 bytes per square inch. Central to the security of cryptographic indicia is checking indicia validity. Section 5 addresses this important issue. 5 Indicia Design What type of cryptographic signature algorithm should we use Most cryptographic signature algorithms require ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

....must be easily printable by commodity or after market laser printers, it must be easily scanned and re digitized at a post office, and it must have sufficient information density to encode all the bits of the stamp on the envelope within a reasonable amount of space. Symbol Technologies PDF417 [26, 37, 38], for example, can encode 400 bytes per square inch, sufficient for cryptographic stamps. Figure 3 shows an example of PDF417 s density. Six lines of 40 full ASCII characters for each address, 6 four bytes each for hierarchical authorization number, a serial number for the software instance that ....

Theo Pavlidis, Jerome Swartz, and Ynjiun P. Wang. Information encoding with two-dimensional bar codes. Computer, 24(6):18--28, June 1992.

....etc. To save the storage space, compression of the ID picture is necessary. This is especially important with portable ID devices where the ID information are stored locally in a portable card, e.g. in a barcode or a magnetic stripe. For example, a PDF 417 label (a type of 2D barcode) [1, 2] can store up to 1 kilobytes (KBs) of data, among which less than 500 bytes could be allocated to store the ID picture. On the other hand, a color ID picture digitized to 128 Theta 128 pixels 24 bits pixel will take 48 KBs in the raw format. This implies that a compression ratio of more than 96 ....

T. Pavlidis, J. Swartz, and Y. P. Wang, "Information encoding with two dimensional bar codes," IEEE Computer, pp. 18-28, June 1992.

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T. Pavlidis, J. Swartz, and Y. P. Wang. Information encoding with two--dimensional bar codes. Computer, 24(6):18--28, June 1992.

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