Sending a physical letter to users with a printed code that they can scan to access information. For example, an energy provider might include a code on their paper bills, which customers can scan to find out more information.
- It relies on someone having access to a specific address, limiting the risk it could be read by someone else
- The code can be formatted for single use, so if it was used once it could not be used again
- The letter helps the user understand what the code is for and what information can be accessed by scanning it
- It requires little effort from users to get access, making it quick and simple
- Letters can be lost, damaged and easily opened by others
- Unless there’s secondary authentication after the code is scanned, anyone could access information
- The user needs a level of digital literacy to be able to scan a code with their device
- Not all phones come with this capability
- Some barcode scanner apps might require huge amounts of unnecessary permissions
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