Organisations that operate around the clock face workforce management challenges that go well beyond standard office hours. Rotating shifts, overnight working, overtime, temporary staff and multiple sites all add complexity to attendance tracking and payroll.
For businesses in healthcare, logistics and manufacturing, choosing the right timeclock is about more than recording when employees start and finish. The right solution improves payroll accuracy, gives managers clearer visibility of workforce attendance, and supports smoother day-to-day operations.
For system integrators, resellers and workforce management providers, understanding these industry-specific requirements is essential when recommending time and attendance solutions.
What Are Access Control Credentials?
An access control credential is a means of verifying a person’s identity when requesting access to a secure area. When a user presents a credential to a reader, the access control system checks whether that individual has permission to enter. If authorisation is confirmed, access is granted. If not, access is denied.
Credentials can take several forms, including physical devices such as fobs and cards, digital credentials stored on smartphones, or biometric identifiers such as fingerprints and facial recognition data. The selected credential can significantly impact security, user convenience, administrative workload, and system scalability.
Key Factors When Comparing Access Control Credentials
Before selecting a credential type, organisations should evaluate several important factors:
- Security – some credentials offer stronger protection against cloning, duplication, or unauthorised sharing than others.
- Convenience – employees are more likely to use security systems correctly when credentials are simple and straightforward.
- Administration – issuing, replacing, revoking, and managing credentials can create a significant workload, particularly for large organisations with high staff turnover.
- Cost – some credentials have low upfront costs, while others reduce long-term administrative expenses or improve operational efficiency.
- Future growth – the chosen strategy should support changing security requirements without requiring a complete system replacement.
Key Fobs
Key fobs remain one of the most widely used credential types in commercial access control systems. Typically attached to a keyring, these small devices contain a unique identifier that is read when presented to a compatible reader.
Many organisations favour key fobs because they are familiar, easy to issue, and relatively inexpensive to replace. They require little user training and can be deployed quickly across sites of almost any size.
However, key fobs do have limitations. Lost or stolen fobs can create security risks if not deactivated promptly, and users may lend fobs to colleagues, making it difficult to confirm that the authorised individual is the person entering the building. While modern encrypted credentials offer stronger protection, some older proximity technologies can be vulnerable to cloning if appropriate security measures aren’t in place. For organisations seeking a simple and cost-effective solution, key fobs often remain a practical choice.
Smart Cards
Smart cards offer many of the same benefits as key fobs while providing additional security and functionality. Unlike basic proximity credentials, smart cards contain embedded microchips that can securely store and process data, allowing for stronger encryption and improved protection against cloning.
Smart cards are commonly used in larger organisations, government facilities, healthcare environments, and educational institutions where stronger identity verification is required. In addition to access control, smart cards can often support multiple functions within a single credential, such as secure printing, cashless payments, or workforce management applications.
The increased functionality and security typically come with higher implementation costs compared to basic fobs, and organisations must manage card issuance, replacement, and lifecycle administration. Despite this, smart cards remain a popular option for organisations seeking a balance between security, flexibility, and user convenience.
Mobile Credentials
Mobile credentials replace physical cards or fobs with digital credentials stored on a smartphone. Users present their phone to a compatible reader using Near Field Communication (NFC) or Bluetooth Low Energy (BLE), and the system verifies the credential in the same way it would a physical card.
Mobile credentials have gained popularity because of their convenience and administrative benefits. Most employees already carry a smartphone throughout the day, and new users can often be issued credentials remotely, eliminating the delays associated with printing cards or distributing fobs. This also simplifies onboarding and offboarding, since administrators can issue, update, or revoke permissions remotely to respond quickly to staffing changes.
There are some considerations to address, however. Organisations may need policies covering personal device usage, and some users may have concerns about using personal phones for workplace access. Device compatibility, battery life, and user adoption should also be considered during implementation. For many organisations, mobile credentials offer a strong combination of convenience, security, and operational efficiency.
Biometric Credentials
Biometric credentials use unique physical characteristics to verify identity, including fingerprint recognition, facial recognition, iris scanning, and palm vein authentication. Because biometric credentials can’t be forgotten, misplaced, or easily shared with another person, they establish a stronger link between an individual and their access privileges, which is particularly valuable in high-security environments.
Biometric authentication is best deployed as one layer within a wider credential strategy rather than a standalone requirement, for example alongside a card or mobile credential as part of multi-factor authentication. It also requires careful planning and governance: biometric data is considered sensitive personal information, and organisations operating in the UK must ensure any collection and processing complies with the UK GDPR and the Data Protection Act 2018.
User acceptance is another factor to weigh. Some employees may have privacy concerns or prefer alternative authentication methods, and environmental conditions can affect performance depending on the technology used. Successful biometric implementation depends on balancing security requirements with privacy, compliance, and user experience.
Credential Comparison at a Glance
- Security: fobs offer moderate protection, smart cards and mobile credentials offer high protection, and biometrics offer very high protection.
- Convenience: fobs, smart cards, and biometrics are all highly convenient for users, while mobile credentials are the most convenient of all, since most employees already carry a smartphone.
- Risk of sharing: fobs carry the highest risk, as they’re easily lent to colleagues. Smart cards carry a moderate risk, mobile credentials a low risk, and biometrics the lowest risk, since they can’t be handed to someone else.
- Administration: fobs and smart cards both involve a moderate administrative load, mobile credentials the least (thanks to remote issuing and revocation), and biometrics a moderate load due to enrolment and governance requirements.
- Scalability: smart cards and mobile credentials scale excellently across sites and users, fobs scale well, and biometrics scale well but require more planning around enrolment.
- Replacement costs: fobs and smart cards carry moderate replacement costs, mobile credentials low costs, and biometrics none, since there’s no physical item to replace.
- User identity assurance: fobs offer the weakest assurance that the credential holder is who they claim to be, smart cards moderate assurance, mobile credentials high assurance, and biometrics the highest.
The best option depends on organisational priorities. A small office may prioritise simplicity and cost, while a healthcare provider or critical infrastructure operator may place greater emphasis on identity verification and compliance.
The Growing Role of Multi-Factor Authentication
Many organisations are moving beyond a single credential type and adopting multi-factor authentication for sensitive areas, requiring two or more forms of verification before access is granted. Examples include a smart card and PIN, a mobile credential and biometric verification, or a smart card and fingerprint. By combining multiple authentication factors, organisations reduce the risk of unauthorised access even if a single credential is compromised. This approach is increasingly common where protecting critical assets, sensitive information, or regulated areas is a priority.
How JanusC4 Puts This Into Practice
JanusC4 is Grosvenor Technology’s access control platform: Grosvenor designs and builds the underlying blade-based controllers and hardware, and develops the software that runs on top of it. Readers, however, are sourced from specialist third-party manufacturers, including HID, Third Millennium, STiD, and IDEMIA, alongside Aperio wireless lock technology from ASSA ABLOY. JanusC4 is supplied complete with the installer or end user’s choice of reader, direct from Grosvenor’s UK warehouse.
This matters for credential strategy. Because the reader hardware is decoupled from the controller and software layer, organisations aren’t locked into a single manufacturer’s card, fob, or biometric ecosystem. A business can start with basic proximity fobs and move to mobile or biometric credentials later, without replacing the underlying system, supported by protocols such as OSDP, which provides secure, standardised communication between readers and controllers and is generally the preferred choice for high-security environments.
That flexibility is also why credential decisions come down to what an organisation’s installer or security partner recommends for their specific environment, rather than being dictated by the platform itself.
Choosing the Right Credential Strategy
Smaller organisations may prioritise affordability and ease of deployment, making fobs or smart cards attractive. Organisations managing multiple sites often benefit from the centralised administration mobile credentials offer, while healthcare providers, government facilities, and critical infrastructure operators may require stronger identity verification through smart cards, biometrics, or multi-factor authentication.
Every credential type offers distinct advantages, and many organisations now use a combination rather than relying on a single method. Rather than focusing solely on the technology itself, the strongest approach is to work with an experienced access control provider who can align credential choices with your current operational requirements and future growth plans.