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Questions tagged [barcode]

The tag has no usage guidance.

50
votes
21answers
19k views

Are there unphotographable, but scannable ID cards?

We have a client who hosts an event, with a tight budget, that uses lanyarded Photo-ID cards with barcodes on them. The barcodes are used to gain access to various areas at the event. We were ...
43
votes
7answers
13k views

How resistant are barcodes and QR-codes against attempts to change stored data?

Assume we want to protect a document against manipulating and forging. So, we encode some sensitive information of the document and store it in a QR-code inserted in the document. Can we be sure that ...
4
votes
3answers
120 views

Using a simple 5-character pass for event vs. QR/barcode

I plan on doing a "ticketing" system, where a user would buy a "tour ticket" online. The part that I'm puzzled about is: After they buy, what mechanism to use to verify the ticket? I've been looking ...
0
votes
3answers
528 views

How to encode user authentication in a barcode

I was suggested to post here from this question in Super User SE. So here is the copy of it: I'm asked to add the possibility to scan a barcode (on a badge) to authenticate users when they log in to ...
5
votes
1answer
461 views

Safety of barcode checksums

A company is handing out gift vouchers with a unique code128 barcode. The barcode consist of 12 fixed characters containing meta information and sequence number plus a 4 digit checksum. For example: ...