Questions tagged [barcode]
6 questions
50
votes
21 answers
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 thinking of proposing a hashed code (currently the IDs…
![](../../users/profiles/192343.webp)
Konchog
- 605
- 1
- 5
- 9
46
votes
7 answers
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 an attacker is not able to change and modify the…
![](../../users/profiles/187204.webp)
Questioner
- 1,277
- 2
- 10
- 14
5
votes
1 answer
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:
B2DS 40453072 6531
first 4 characters: identifier…
![](../../users/profiles/167026.webp)
user1884155
- 151
- 1
4
votes
3 answers
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 at how platforms like EventBrite, TicketMaster,…
![](../../users/profiles/135026.webp)
anemaria20
- 141
- 2
1
vote
1 answer
Avoid QR/Barcode duplicates for fake product identification
I'm developing an app for a college project to detect fake products. The idea is to scan a QR or barcode and the app will automatically tell you if the product is either original or fake.
How to avoid the duplication of a QR or barcode, so each one…
![](../../users/profiles/282424.webp)
Ale26
- 13
- 2
0
votes
3 answers
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 my app. In this context, my customer has no…
![](../../users/profiles/181136.webp)
lemon
- 111
- 3