In the hotel industry, security and guest experience are everything. Behind the scenes, many hotel brands and lock manufacturers are moving from legacy RFID key card technology to NXP AES-based chips — using the same AES encryption standard trusted in payment and transit systems worldwide.
At Hotel & Resort Key Cards, we’re seeing this shift accelerate across the industry, and for good reason.
1. Legacy Chips Have Known Security Gaps
Older RFID key cards based on MIFARE Classic use Crypto1, a proprietary encryption that was publicly broken in 2008. These cards can be read and cloned with inexpensive equipment, which means a lost or stolen card could be duplicated. NXP itself no longer recommends MIFARE Classic for security-relevant applications. AES chips close this gap with modern, standard cryptography.
2. AES Encryption Raises the Standard
NXP’s MIFARE Ultralight AES, designed specifically for limited-use credentials like hotel key cards, uses 128-bit AES authentication, with an optional secure messaging mode to protect data sent between the card and the lock.
Cards are far harder to clone, and an originality signature lets systems verify a genuine NXP chip.
An optional counter can limit repeated failed authentication attempts.
Hotels gain stronger guest and staff access security.
This level of protection aligns with what global brands now expect for physical access control.
3. Upgrading Can Be Gradual
Many hotels assume a full system replacement is required to move to AES. That depends on your locks. NXP’s AES chips are ISO/IEC 14443 compliant, and many current lock platforms can support them through software, firmware or encoder updates — but some older locks need hardware changes. Check with your lock manufacturer, then test cards before switching your stock.
4. Ideal for Multi-Credential Environments
Hotels are increasingly using RFID technology beyond room access — for parking, amenities, employee areas, and mobile integration. NXP now offers AES across its MIFARE range, from single-use cards up to multi-application credentials, making it easier to standardize on one security approach.
5. Stronger Guest Trust and Brand Protection
Guests assume their hotel key is secure. When news breaks about cloned or hacked cards — like the 2024 “Unsaflok” disclosure affecting millions of hotel locks — brand confidence takes a hit. Moving to stronger credentials reinforces a brand’s reputation for guest safety.
6. Sustainability
VingCard notes that MIFARE Ultralight AES features “DARK Green” classified silicon, supporting more sustainable paper and card-based credentials.
7. Why Hotels Are Upgrading Now
Major lock vendors, including VingCard/ASSA ABLOY, now support MIFARE Ultralight AES credentials.
Older MIFARE Classic systems have publicly known vulnerabilities.
Hotels are seeking future-proof credential systems that work with both physical and mobile keys.
Security expectations from guests and brands have never been higher.
The Bottom Line
The move to NXP AES technology represents the next generation of guest access security. It’s more secure and more flexible — and with the right lock support, easier to implement than many hotels realize.
Contact us to learn more about AES-encrypted RFID key cards and how to future-proof your property’s access control.
Sources & further reading
- MIFARE Ultralight AES fact sheet — NXP Semiconductors
- MIFARE Ultralight AES — NXP / MIFARE
- Vingcard Boosts Hotel Security with MIFARE Ultralight AES Compatibility — Hospitality Net
- Security Statement on Crypto1 Implementations — NXP / MIFARE
- Saflok Lock Vulnerability Can Be Exploited to Open Millions of Doors — SecurityWeek
- FIPS 197: Advanced Encryption Standard (AES) — NIST