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Small-amount Payment Field

<300ms

TRANSIT TRANSACTION

EAL4+

SECURITY LEVEL

Offline

NO NETWORK REOUIRED

OTA

DYNAMIC SERVICE UPDATE

Key Application Areas

Application of Java Smart Cards
in the Field of Micropayments

Java smart cards, thanks to their security, reliability, and support for dynamic loading of multiple applications, have become a core technology in small-value payment scenarios and are widely used in high-frequency, low-value transaction environments such as transportation, retail, and public utility payments.

Public Transport Contactless Payment Access

PUBLIC TRANSIT·FLASH PAY

Public Transport "Contactless Payment" Access

ISO 14443 contactless Java cards enable “tap and go” rapid payment. City transit card systems support top-up, consumption, and balance enquiry — transactions require no network verification, making them fast and stable even at peak passenger volumes with hundreds of simultaneous gate entries per minute.

ISO 14443

Tap & Go

Offline Auth

Balance Enquiry

Retail and Convenience Small-Ticket Purchases

RETAIL·CONVENIENCE

Retail and Convenience Small-Ticket Purchases

Used in supermarkets, fast food restaurants, and vending machines, users complete offline payments through POS terminals. PIN-free for small amounts, reducing friction at checkout and lowering merchant network costs significantly — ideal for high-volume, thin-margin retail environments.

PBOC 3.0

Offline POS

PIN-free

Batch Top-up

Broadcasting and Pay-TV

BROADCASTING·DIGITAL TV

Broadcasting and Pay-TV

Java cards serve as the core component of Conditional Access Systems (CAS), supporting programme subscription and on-demand billing via on-card e-wallet. Anti-tamper with remote key update capability — when cryptographic risks emerge, new keys are deployed without any hardware replacement.

CAS System

CableLabs

Remote Key

E-wallet

DUAL INTERFACE·MULTI-SCENARIO

Dual-Interface Card Integration Applications

Cards supporting both contact and contactless dual-mode can use contactless for rapid mall payments and contact interface on set-top boxes. A single card handles multiple scenarios — maximizing lifecycle value while minimizing the number of cards users must carry across all daily payment touchpoints.

ISO 7816

ISO 14443

One Card

Long Lifecycle

SECURITY DESIGN

🔒
Multi-Layer Security
Hardware-rooted security with JCVM isolated sandboxes, EAL4+ certification, and ECC/DES encryption to protect every transaction in fully offline environments.
🃏
One Card, Many Uses
A single card runs e-wallet, transit, access control, and identity apps simultaneously. OTA adds or updates services after issuance — no hardware replacement ever needed.
🌐
Built for Compatibility
Compliant with ISO/IEC 7816, EMV, and PBOC international standards — one card works seamlessly across operators, cities, and countries with minimal integration effort.

Safety Design

Three Security Design Highlights

In offline payment environments, the Java card for small-amount payment field itself must be the security authority. Three hardware-enforced mechanisms protect every transaction.

Security at a Glance
EAL4+
Min security certification
0
Keys ever transmitted
MAC
Per-transaction auth code
OTA
Remote key rotation

·Offline Anti-Replay Attack

Through MAC (Message Authentication Code) and transaction sequence number mechanisms, repeated submission of the same transaction is prevented. Each transaction generates a unique authentication code — intercepted data cannot be reused to fraudulently deduct funds.

·Application Isolated Execution

Each Applet executes within an independent Security Domain, without mutual interference. A vulnerability in the transit Applet cannot affect the e-wallet Applet — all payment functions remain stable simultaneously.

·Dynamic Key Management

Supports remote key updates and rotation via OTA. When a cryptographic risk is identified, new keys are deployed to all field cards without physical replacement — maintaining long-term payment ecosystem security.

Scenario Comparison

Comparison of Java Smart Cards in
Micropayment Application Scenarios

The following is a comparison of the four core application scenarios, compiled based on industry standards and technical specifications, covering key dimensions such as transaction methods, security mechanisms, and terminal compatibility:

Scenario Transaction Method Network Standards Terminal Avg Time Security Key Advantage
🚌 Transit
Public Transit
 Contactless offline ✗ No ISO 14443 · Transit Union Bus gate · Metro turnstile <300ms EAL4+ Second-level access, no network, stable at high concurrency
🛒 Retail
Retail Consumption
 Contactless offline ✗ No PBOC 3.0 · EMV POS terminal · Vending <500ms EAL4+ PIN-free small amounts, reduced merchant costs, batch top-up
📺 Digital TV
Broadcasting & TV
 Contact offline deduction ✗ No PBOC · EMV · CableLabs Set-top box · Card reader <800ms EAL4+ On-card e-wallet billing, remote key updates
💳 Dual Mode
Dual Interface
 Contact + Contactless dual ✗ No ISO 7816 · ISO 14443 Multi-function reader · POS + Gate <600ms EAL4+ Single card multi-scenario, extends lifecycle value

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