A cloned access card could open the wrong door. A misplaced label could make genuine products unusable. And a compromised reader could undermine the security of a trusted tag.
These risks can begin during product selection. For example, choosing a chip that isn’t supported by your existing infrastructure may create compatibility and security issues.
RFID security involves the entire system, including tags, readers, networks, cryptographic keys, software, and physical safeguards. The National Institute of Standards and Technology (NIST) treats RFID security as a system-level concern.
This guide outlines common vulnerabilities and recommends safeguards to help address them.
What Is RFID Security?
RFID security protects RFID data, devices, access points, and related business information from unauthorized use, tampering, or disruption.
RFID Identification vs Authentication
Identification determines which tag responded to a request. Authentication goes a step further by confirming that the tag is legitimate.
Identifiers such as the UID, TID, or EPC can support identification. For higher-risk applications, cryptographic authentication is often necessary.
RFID Security vs RFID Security Systems
RFID security focuses on protecting RFID technology itself. An RFID security system uses RFID technology to support functions such as access control, asset tracking, and identity verification.
The Main Goals of RFID Security
An effective RFID security program should protect the confidentiality, integrity, authenticity, availability, and privacy of information. It should also record failed access attempts, key changes, and other security-related events.
Where Do RFID Security Risks Occur?
RFID security threats can occur at every layer of the system. For example, an office may use secure access cards but rely on older readers with exposed wiring that could allow someone to bypass the controller. That’s why every part of the system needs protection.
RFID Tag and Card Layer
RFID tags and cards may store identifiers, passwords, counters, or secret keys. Attackers may try to steal data, alter the tag’s memory, clone credentials, or move a tag to another item.
Choosing the right chip and label design can help reduce these risks.
Wireless Communication Layer
RFID tags and readers communicate through radio signals. Common threats include unauthorized scanning, interception, replay attacks, relay attacks, and signal jamming.
Encryption can protect transmitted data, but it can’t prevent every type of wireless attack.
Reader and Network Layer
Readers connect RFID credentials to business systems. Weak passwords, outdated firmware, unnecessary open ports, and insecure APIs can all create vulnerabilities.
Backend and Operational Layer
Backend systems store permissions, identities, event records, and cryptographic keys. Access should be limited to authorized users, and lost cards should be revoked quickly. Key updates, unusual activity, and other security events should also be tracked and reviewed.
What Are the Most Common RFID Security Threats?
Unauthorized Reading and RFID Skimming
An unauthorized reader can scan a nearby tag without permission. The risk increases if the tags expose meaningful business information. Don’t store sensitive data on the front end.
Eavesdropping
An attacker can eavesdrop on any valid interaction between a tag and a reader. Secure communication is required if intercepted data could be harmful. Manage reading areas.
RFID Cloning
An attacker may clone readable information or emulate tag behavior. If your security checks rely on only one static value, cloning will be easy. Proper authentication will make cloning difficult.
Spoofing and Card Emulation
The device mimics the behavior of a trusted card, tag, or reader. Authentication at both ends will benefit both sides.
Replay Attacks
A replay attack involves capturing valid communication and sending it again. Random challenge-response pairs will protect you from replay attacks.
Relay Attacks
This involves forwarding a live interaction over a greater distance. The encryption may remain the same during the process. Time-based restrictions and other mechanisms might be required.
Data Tampering
Attackers may change an EPC, URL, status, or access level. You should restrict write access to the data and validate critical information on the back end.
Tracking and Privacy Risks
A response that remains constant may allow attackers to uniquely identify an object in multiple locations. Use minimal data and provide privacy settings to mitigate tracking risks.
Jamming and Denial of Service
Radio-frequency jamming may interrupt regular interaction between a tag and a reader. Implement alerts, additional reading points, and manual procedures.
Physical Tag Tampering
An attacker may detach, attach, damage, or transport legitimate tags. Fragile labels, VOID labels, and removal-triggered labels should be used when necessary.
Can RFID Tags and Cards Be Cloned?
RFID tags and cards can sometimes be duplicated or emulated. However, copying publicly accessible information is different from compromising cryptographic credentials.
Why UID-Only RFID Systems Are More Vulnerable
A UID typically identifies the tag, but it doesn’t provide authentication. Another device may be able to duplicate the UID and meet the requirements of systems with weak security standards.
Data Copying vs UID Cloning vs Card Emulation
| Technique | Significance |
| Data copying
| Transfers readable data to another tag |
| UID cloning | Copies the identifier to another device |
| Card emulation | Makes another device behave like the original card |
| Credential cloning | Obtains enough protected information to bypass authentication |
What Makes an RFID Tag Harder to Clone?
Use challenge-response authentication, protected keys, dynamic data, and backend verification security measures. Avoid using common default keys, and design the system so that compromising one tag doesn’t put all other tags at risk.
RFID Security by Frequency
Frequency affects range, speed, and reading behavior, but it doesn’t determine security on its own.
LF RFID Security
Older 125 kHz access cards often use a fixed identifier. The risk is higher when the controller checks only this number. Security should be assessed across the chip, reader, and door-control logic as a whole.
HF RFID and NFC Security
HF RFID and NFC operate at 13.56 MHz, but chip capabilities vary significantly. For example, MIFARE DESFire EV3 supports AES encryption and secure messaging.
UHF/RAIN RFID Security
UHF supports long-range and batch scanning. This makes it useful in warehouse environments, but it also increases the potential reading distance. GS1 states that Gen2v2 supports password-protected memory locking. However, locked EPC information may still remain readable.
Active RFID Security
Active tags use battery power and provide a longer communication range. Protect the firmware, user account credentials, network connections, and location data.
RFID Security Technologies Explained
Password Protection and Memory Locking
Passwords restrict certain actions, while memory locks prevent changes to stored data. These controls help protect stored information, but they don’t always provide authentication.
RFID Encryption
Encryption protects specific information or communications. Determine exactly what is encrypted and who controls the encryption keys.
Challenge-Response Authentication
The reader sends a random challenge, and the tag responds using its secret key. Using a different challenge each time reduces the risk of replay attacks.
Mutual Authentication
The reader and tag authenticate each other. Mutual authentication reduces the risk of attacks involving a fraudulent tag or reader.
Secure Messaging and Session Keys
Session keys protect subsequent communications after successful authentication. This limits the use and exposure of long-term keys.
Digital Signatures and Dynamic Authentication
Dynamic authentication generates new proof of authenticity with each read. Digital signatures can also help verify the origin of the data. NTAG 424 DNA supports AES-128 encryption and tap-specific data.
Kill and Privacy Features
Some UHF RFID tags include kill or privacy features. Consider product returns and item reuse when planning how these features will be applied.
Tamper-Evident RFID Labels
These tags are designed to show signs of tampering or become unusable when removed. They may tear, display a visible mark, or become disabled after tampering. They help prevent tag transfer but don’t protect against wireless attacks.
How to Secure an RFID System
Step 1. Identify What Needs Protection
Clarify what you are protecting: identity, product, asset, information, authorization, etc.
Step 2. Choose the Right RFID Chip
Choose based on the risk and other characteristics, such as range, performance, and price.
Step 3. Store Only Necessary Data on the Tag
You should store only your identifier/authenticator on the tag and keep more sensitive data on the back end.
Step 4. Avoid UID-Only Authentication
Don’t implement a solution that relies on unique identifiers (UIDs) to provide anti-counterfeiting mechanisms or asset security features.
Step 5. Manage RFID Keys Securely
Change your default keys. Separate key management projects. Limit access to keys. Log all operations.
Step 6. Protect Readers and Networks
Create new user accounts and update firmware. Use secure APIs, network segregation, and encryption.
Step 7. Add Physical Tamper Protection
Design the label properly based on the material that will be used and the type of tampering.
Step 8. Monitor Suspicious RFID Events
Identify duplicates, failures, and unusual locations.
Step 9. Test the Complete System
Test authentication, range, various APIs, disconnection, removal from a list, and batch encoding.
RFID Security Best Practices by Application
Access Control and Hotel Key Cards
The company may use old cards that generate fixed numbers. Find out the card and reader types. Test authentication, expiration, and revocation procedures. Upgrading may require new readers.
Product Authentication
An identical UID makes a copy look legitimate. Consider dynamic authentication, backend validation, and tamper-resistant labels. Test the phones, label adhesive, and server response time.
Asset and Supply Chain Tracking
An organization needs rapid UHF reads on tens of thousands of assets. Don’t introduce costly security where there’s no risk. Protect memory chips, readers, and backend events.
Vehicle Identification
A standard windshield sticker may migrate to other cars. Destructible materials and authentication should be employed. Plate validation should be considered for vulnerable access points.
Practical Selection Case
A parts manufacturer wants phone verification for its high-quality products. A standard NFC URL sticker is cheaper. However, counterfeiters can duplicate the URL. The group chooses dynamic authentication and destructible labels. The group tests phones, label destruction, and server response time.
How to Choose a Secure RFID Tag or Card
Define the Required Security Level
Do you need to make it unreadable, unwritable, unclonable, transfer-proof, and untrackable?
Check the Chip Security Features
Consider password protection, locking mechanisms, data encryption, authentication, counting, and privacy. Obtain up-to-date datasheets on chip security.
Confirm Reader and Software Compatibility
Although the chip may be secure, specialized readers and other modifications to the existing infrastructure may still be required. It’s critical to test everything before purchasing.
Select the Right Physical Construction
Select the proper tag construction with regard to metal, liquids, temperature, weather, chemicals, and tampering.
Test Samples Before Mass Production
Test to ensure that the chips are readable, writable, secure, and positioned appropriately in your setting. Specify the reader, range, surfaces, and quantities.
RFID Security vs RFID Privacy
An RFID-based employee card can be highly secure but still raise privacy issues. The access system can log the places and times at which the card was used.
RFID security is about protecting RFID cards, readers, and access data from being copied, altered, or misused. RFID privacy relates to managing information about people gathered by RFID systems and determining how long it’s maintained.
When choosing cards, readers, and access software, consider access control permissions and data retention settings. Thus, an office can limit access to access logs and retain those logs only for as long as required.
Common RFID Security Myths
All RFID Tags Can Be Easily Cloned
Security depends on the chip, authentication, and RFID system design.
A Unique UID Makes an RFID Tag Secure
A unique identifier doesn’t guarantee security.
Short Read Range Eliminates Security Risks
A shorter range reduces the risk. It doesn’t eliminate every threat.
Password Protection Is the Same as Encryption
A password prevents unauthorized actions, while encryption ensures the integrity of data or messages.
AES Makes the Entire RFID System Secure
AES doesn’t compensate for poor key, reader, account, or back-end security.
RFID-Blocking Products Solve Every RFID Risk
RFID shielding limits access to radio waves while the tag remains shielded. It doesn’t address poor key, reader, or back-end security.
RFID Security Checklist
- Define the business risk.
- Change the default passwords and keys.
- Don’t use only the UID for authentication.
- Don’t store more information than necessary on the tag.
- Secure the reader, API, and database.
- Isolate and audit project keys.
- Revoke lost credentials immediately.
- Analyze anomalous RFID activity.
- Verify tamper resistance and compatibility.
- Test samples before mass production.
Conclusion: RFID Security Requires Layered Protection
Understand your true business threats. Use the appropriate chip, reader, keys, software, and tag configuration. Test everything before going into production.
Send information about your application, reader, range, material, threats, and volume to JLTRFID. JLTRFID can compare chips and provide test tags.
Frequently Asked Questions
Is RFID Secure?
RFID can be secure if you protect the entire system.
Can RFID Tags Be Cloned?
Some static tags can be cloned or emulated.
Can RFID Cards Be Hacked?
An attacker can hack cards, readers, keys, networks, and back-end systems.
How Can RFID Cloning Be Prevented?
Authentication, key separation, back-end validation, and event monitoring are required.
Is NFC More Secure Than RFID?
NFC is a type of RFID technology. It all depends on the chip and system design.
Is UHF RFID Secure?
It can be secure. Due to its greater range, special controls are necessary.
Does RFID Encryption Prevent Cloning?
Encryption is important, but authentication and secure keys are also necessary.
What Is the Difference Between RFID Passwords and Encryption?
A password limits actions. Encryption is used to protect certain data or messages.
What Is the Most Secure RFID Card?
It depends on the risk, the reader’s capabilities, and key management.
What Information Should Be Stored on an RFID Tag?
Only the required identifier and/or authentication information.
