eSSL S70 MiFare Hotel Lock Cards – 4KB Memory for Advanced Hospitality Access Control
The eSSL S70 MF (MiFare) card is a high‑security contactless smart card designed for advanced hotel lock systems, access control, and multi‑application credentials. Operating at 13.56 MHz and compliant with ISO 14443A, the S70 card is part of the industry‑standard MiFare Classic 4K family. With four times the memory of standard 1K cards, it provides expanded capacity for guest room access, staff identification, energy management, loyalty programmes, and facility‑wide access – all on a single credential. Fully compatible with eSSL hotel locks and leading hospitality management platforms, the S70 card delivers superior flexibility and security for modern hotel operations.
📌 What is the eSSL S70 MiFare Card?
The eSSL S70 MiFare card (also known as MF Card, S70 hotel lock card, or MIFARE Classic 4K) is a contactless smart card based on NXP‘s MIFARE® technology. It contains 4 KB of EEPROM memory, organised into 40 sectors – 32 sectors of 64 bytes (4 blocks each) and 8 sectors of 256 bytes (16 blocks each). The card requires no internal battery; it is powered passively by the electromagnetic field of a compatible reader, such as an eSSL door lock or hotel lock encoder.
These cards are widely used in hotel environments for guest room access, master key systems, staff identification, and energy management systems. They are fully compatible with eSSL‘s HL‑100, HL‑200, and other hotel lock models, as well as third‑party hospitality systems that support MiFare Classic 4K technology (13.56 MHz, ISO14443A). Each card contains a unique, factory‑programmed serial number (UID) for individual identification and anti‑cloning measures. The 4KB memory provides ample capacity for storing multiple applications on a single card – such as room access, cashless payments, and loyalty programmes – each secured by its own encryption keys.
📊 Technical Specifications – eSSL S70 MiFare Card
| Card Type | MIFARE Classic 4K (MF1 IC S70) – Contactless Smart Card |
|---|---|
| Operating Frequency | 13.56 MHz (High Frequency / HF) |
| Standards Compliance | ISO/IEC 14443A, ISO/IEC 18092 (NFC type 2 compatible) |
| Memory Capacity | 4 KB (4096 bytes) EEPROM |
| Memory Organisation | 32 sectors × 64 bytes (4 blocks each) + 8 sectors × 256 bytes (16 blocks each); total 40 sectors, 80 data blocks + 40 sector trailers |
| Read / Write Range | Up to 100 mm (depends on reader antenna geometry) |
| Data Transfer Rate | 106 kbit/s (fast transaction performance) |
| Data Integrity | 16‑bit CRC, parity, bit coding, anticollision, bit counting |
| Write Endurance | > 100,000 cycles per sector |
| Data Retention | ≥ 10 years |
| Physical Size / Format | CR80 – 85.5 mm × 54 mm × 0.8 mm (credit card size) |
| Card Material Options | PVC (standard), PET, ABS, wood, metal (custom) |
| Operating Temperature / Humidity | -20°C to +50°C / up to 90% RH |
| Storage Temperature / Humidity | -25°C to +50°C / 20–90% RH |
| Customisation Options | CMYK offset printing, silk‑screen, serial numbering, logo printing, QR codes, magnetic stripe, signature panel |
| Card Durability | Wear‑resistant, waterproof, reusable over thousands of access cycles |
📊 Comparison: eSSL S50 (1KB) vs eSSL S70 (4KB) MiFare Cards
| Feature | S50 (1KB) – Standard Capacity | S70 (4KB) – High Capacity |
|---|---|---|
| Total Memory | 1 KB (1024 bytes) | 4 KB (4096 bytes) |
| Number of Sectors | 16 sectors | 40 sectors (32 × 64‑byte + 8 × 256‑byte) |
| User Data Blocks | 48 data blocks (3 per sector × 16) | 80 data blocks (per sector layout) |
| Multi‑Application Capacity | Good for 1‑2 applications | Excellent for 5+ applications on same card |
| Typical Use Cases | Room access only | Room access + payments + loyalty + staff credentials |
The S70 card‘s extended memory and sector structure make it the preferred choice for hotels planning to implement multi‑application credentials – combining door access with cashless payments, loyalty programmes, and guest services on a single card.
🔒 Advanced Security Features of eSSL S70 MiFare Cards
✅ Mutual Three‑Pass Authentication (ISO/IEC 9798‑2)
Before any read or write operation, the lock and the card perform mutual authentication using a challenge‑response mechanism. This bidirectional verification prevents unauthorised devices from reading card data and stops card cloning attempts.
Before any read or write operation, the lock and the card perform mutual authentication using a challenge‑response mechanism. This bidirectional verification prevents unauthorised devices from reading card data and stops card cloning attempts.
✅ Data Encryption on RF Channel
All communication between the card and the reader is encrypted, protecting against eavesdropping and replay attacks. Each transaction uses dynamically keyed session encryption, ensuring the same command produces different ciphertext each time.
All communication between the card and the reader is encrypted, protecting against eavesdropping and replay attacks. Each transaction uses dynamically keyed session encryption, ensuring the same command produces different ciphertext each time.
✅ Individual Set of Two Keys per Sector
Each of the 40 sectors has two independent 48‑bit keys (Key A and Key B). Different applications can reside in separated sectors, each with distinct cryptographic keys, allowing multi‑application use on a single card (guest access, staff area, canteen payment, loyalty points) with independent security per application.
Each of the 40 sectors has two independent 48‑bit keys (Key A and Key B). Different applications can reside in separated sectors, each with distinct cryptographic keys, allowing multi‑application use on a single card (guest access, staff area, canteen payment, loyalty points) with independent security per application.
✅ Unique Factory‑Programmed Serial Number (UID)
Every S70 card carries a unique 32‑bit or 7‑byte identifier (UID) burned in during manufacturing. This identifier cannot be altered, enabling absolute traceability of each individual card and blocking cloned cards from being accepted.
Every S70 card carries a unique 32‑bit or 7‑byte identifier (UID) burned in during manufacturing. This identifier cannot be altered, enabling absolute traceability of each individual card and blocking cloned cards from being accepted.
✅ Transport Key Protection
Newly shipped cards are protected by a transport key that restricts access to on‑chip EEPROM until the key is changed by the hotel‘s security administrator. This prevents misuse during the supply chain.
Newly shipped cards are protected by a transport key that restricts access to on‑chip EEPROM until the key is changed by the hotel‘s security administrator. This prevents misuse during the supply chain.
✅ Sector‑Specific Access Conditions
For each sector, the access control bits embedded in the sector trailer define which keys (A/B) are required for read, write, increment, decrement, and other operations. Granular permissions can be assigned per sector and operation type, creating a robust security zoning system.
For each sector, the access control bits embedded in the sector trailer define which keys (A/B) are required for read, write, increment, decrement, and other operations. Granular permissions can be assigned per sector and operation type, creating a robust security zoning system.
🏢 Multi‑Application Use of eSSL S70 MiFare Cards
With 4KB of memory and 40 independent sectors, the S70 card can securely host multiple applications on a single credential. Typical hotel implementations include:
🏨 Guest Room Access
Primary function: guest key card for unlocking hotel room doors. Paired with eSSL HL‑100, HL‑200, or compatible hotel locks, the card grants guest access to a designated room for a specific time period. The BIS Hotel management system encodes access rights onto the card during check‑in.
Primary function: guest key card for unlocking hotel room doors. Paired with eSSL HL‑100, HL‑200, or compatible hotel locks, the card grants guest access to a designated room for a specific time period. The BIS Hotel management system encodes access rights onto the card during check‑in.
🔑 Master Key & Staff Cards
S70 cards can be programmed as floor masters, sub‑masters, or emergency override cards for housekeeping, maintenance, and senior management. Different access levels can be stored in different sectors of the same card.
S70 cards can be programmed as floor masters, sub‑masters, or emergency override cards for housekeeping, maintenance, and senior management. Different access levels can be stored in different sectors of the same card.
⚡ Energy Saving Switch (Room Power Control)
Same card that opens the door can be inserted into the room‘s energy saver slot to activate electricity for lights, air conditioning, and outlets – automatically cutting power when the guest leaves, reducing hotel energy costs.
Same card that opens the door can be inserted into the room‘s energy saver slot to activate electricity for lights, air conditioning, and outlets – automatically cutting power when the guest leaves, reducing hotel energy costs.
💳 Cashless Payments & Canteen Management
Dedicated sectors can store monetary value or prepaid meal credits. Guests can use the same card to charge meals, spa services, minibar items, and other incidentals directly to their room folio.
Dedicated sectors can store monetary value or prepaid meal credits. Guests can use the same card to charge meals, spa services, minibar items, and other incidentals directly to their room folio.
🏢 Staff & Contractor Access Control
Issue S70 cards to employees (housekeeping, front desk, security) for accessing back‑of‑house areas, stores, elevators, and offices. Access rights can be time‑zoned and sector‑based, ensuring appropriate permissions.
Issue S70 cards to employees (housekeeping, front desk, security) for accessing back‑of‑house areas, stores, elevators, and offices. Access rights can be time‑zoned and sector‑based, ensuring appropriate permissions.
🛂 Multi‑Arena & Facility Management
In resorts, convention centres, or large hotels, S70 cards can be used for access to meeting rooms, sport facilities, car parks, club lounges, and other common areas – all from a single credential.
In resorts, convention centres, or large hotels, S70 cards can be used for access to meeting rooms, sport facilities, car parks, club lounges, and other common areas – all from a single credential.
🌟 Why Choose eSSL S70 MiFare Cards for Your Hotel Property?
Industry‑Standard Technology
Based on the proven MIFARE Classic 4K platform from NXP, the S70 card is the de‑facto standard for advanced hotel lock systems worldwide. It guarantees broad compatibility with existing encoders, hotel management software, and third‑party lock hardware from leading manufacturers.
Based on the proven MIFARE Classic 4K platform from NXP, the S70 card is the de‑facto standard for advanced hotel lock systems worldwide. It guarantees broad compatibility with existing encoders, hotel management software, and third‑party lock hardware from leading manufacturers.
Exceptional Durability & Reusability
S70 cards are built to withstand daily use in busy hotel environments. With over 100,000 write cycles and 10‑year data retention, the cards can be continually reprogrammed for new guests without performance degradation. The PVC base material is rigid and resists cracking, bending, and moisture.
S70 cards are built to withstand daily use in busy hotel environments. With over 100,000 write cycles and 10‑year data retention, the cards can be continually reprogrammed for new guests without performance degradation. The PVC base material is rigid and resists cracking, bending, and moisture.
Uncompromising Security
Mutual authentication, encrypted RF channel, sector‑specific keys, and a unique factory‑burned UID make the S70 card highly resistant to cloning and unauthorised duplication – a critical requirement for guest safety and asset protection.
Mutual authentication, encrypted RF channel, sector‑specific keys, and a unique factory‑burned UID make the S70 card highly resistant to cloning and unauthorised duplication – a critical requirement for guest safety and asset protection.
4KB Memory – True Multi‑Application Readiness
With 4KB of memory and 40 sectors, the S70 card can securely store multiple applications: room access, cashless payments, loyalty points, staff credentials, and facility management – all on a single card with independent encryption per application.
With 4KB of memory and 40 sectors, the S70 card can securely store multiple applications: room access, cashless payments, loyalty points, staff credentials, and facility management – all on a single card with independent encryption per application.
Custom Branding & Design Options
Full‑colour CMYK offset printing, screen‑printing, laser engraving, magnetic stripe addition, and signature panel are available. Cards can be customised with hotel logos, room numbers, serial sequences, QR codes, and multi‑language lock instructions – turning a functional credential into a marketing tool.
Full‑colour CMYK offset printing, screen‑printing, laser engraving, magnetic stripe addition, and signature panel are available. Cards can be customised with hotel logos, room numbers, serial sequences, QR codes, and multi‑language lock instructions – turning a functional credential into a marketing tool.
Seamless Integration with eSSL Ecosystem
Optimised for eSSL hotel locks, key encoders, and BIS Hotel property management software. The S70 card works out of the box with eSSL HL‑100, HL‑200, and future lock models. eSSL provides bulk encoding, configuration, and custom key management.
Optimised for eSSL hotel locks, key encoders, and BIS Hotel property management software. The S70 card works out of the box with eSSL HL‑100, HL‑200, and future lock models. eSSL provides bulk encoding, configuration, and custom key management.
❓ Frequently Asked Questions – eSSL S70 MiFare Cards
What types of MiFare cards are supported by eSSL hotel lock systems?
eSSL hotel locks support both MiFare Classic 1K (S50) and 4K (S70) cards, as well as compatible cards from leading manufacturers such as NXP, ensuring broad compatibility with hotel management systems and encoders.
What are the key differences between S50 (1KB) and S70 (4KB) MiFare cards?
The S70 card offers four times the memory (4KB vs 1KB) and a different sector layout: 32 sectors of 64 bytes each plus 8 sectors of 256 bytes each, totalling 40 sectors. This extra capacity enables multi‑application use on a single card – such as guest room access, staff area entry, canteen payments, and loyalty points – all with independent security keys per sector.
What security features do S70 MiFare cards offer?
S70 MiFare cards include mutual three‑pass authentication (ISO/IEC 9798‑2), data encryption on the RF channel with replay attack protection, individual encryption keys per sector, a unique factory‑programmed 32‑bit serial number, and transport key protection to prevent unauthorised chip access during delivery.
Can S70 cards be customised with a hotel‘s logo or branding?
Yes. eSSL S70 MiFare cards can be customised with CMYK full‑colour offset printing, including logos, patterns, and serial numbers. Customisation supports the standard CR80 size (85.5 mm × 54 mm × 0.8 mm), with options for matte, glossy or frosted finishes. Minimum order quantities apply for custom printing.
What is the expected lifespan of an eSSL S70 hotel key card?
The S70 card has a write endurance of over 100,000 cycles and a data retention period of 10 years, providing a long service life under normal hotel operating conditions. The card is physically durable and designed for repeated use.
Is the S70 card compatible with eSSL‘s energy saving switch?
Yes, the S70 MiFare card can be used interchangeably in both the hotel door lock and the room‘s energy saving switch. The same card that opens the guest room can be inserted into the energy saver slot to activate lighting, air conditioning, and electrical outlets – delivering a seamless guest experience.