Why all QR codes are not the same
If you are looking at secure QR codes, you need to understand the range of secure QR codes available. For example, there can be self-contained codes with mainly textual information or codes that contain a lot more data, including photographs and files. Sometimes there can be a mix of different types of information, some of which can be checked offline, while data connectivity is needed for the rest. In some cases, you may be redirected to a web address. The choice will depend on the use case and the functionality desired. Here is a complete list of the range of QR codes that Qryptal offers
Primary Data Codes (PDC):
Extended Data Codes (EDC):
Hybrid Data Codes (HDC):
Redirect QR Codes:
AD-Integrated Identity QR Codes:
1. Primary Data Codes (PDC):
PDC or Primary Data Codes are self-contained codes that can be validated offline. These codes can contain up to about 2KB textual data, and their image size varies depending on the amount of data encapsulated. Because they can be validated offline, these codes can be used in air-gapped environments.
2. Extended Data Codes (EDC):
Extended Data Codes or EDCs require network/data connectivity to validate the contents. EDCs can contain much more data, including attachments like photos and PDFs. This is possible because the data is stored as encrypted blobs in the Additional Data Repository (ADR). With EDC, the decryption key is stored inside the QR content and is unique. Thus, a unique decryption key is generated for every code. The significant advantage is that the information can be updated using the ‘update API’. The image size of the code is nearly constant.
A Range of Secure QR Codes
3. Hybrid Data Codes (HDC):
Hybrid Data Codes, or HDCs, as the name suggests, combines the features of both the Primary Data Codes (PDC) and Extended Data Codes (EDC). The PDC information is available when the validation is offline, and EDC information is online. The image size of the code is variable and depends upon the amount of PDC data. E.g., in an ID card, HDC can be used, where the PDC portion could be used for validating textual information related to identity. In addition, the EDC portion may be used for photographs or other information which needs to be checked in real-time.
4. Redirect QR Codes:
As the name suggests, Redirect QR Codes, when scanned, will redirect users to other target web addresses or URLs. The target address can also be changed later, even after the QR code has been distributed.
5. AD-Integrated Identity QR Codes:
Active Directory (AD) Integrated Identity QR Codes or ADI QR Codes are usually issued to staff with automatic syncing of details (e.g., designation, contact details) with automatic disabling once the staff leaves the organization.
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