jTOP for Cards (Java Trusted Open Platform):
High security to meet the most stringent requirements, in a modular architecture that eases
customization and updates.

jTOP features a three-layer architecture, from the Operating System all the way up to the Java and GlobalPlatform components: 

The jTOP series of platforms all share the same modular design and world class security.
Customizability and security are a unifying theme across jTOP platforms and actually form the jTOP
brand

Customizability
Dynamic ROMizing (pre-issuance masking capability)
This feature allows you to integrate new Java Card? applications into the ROM code, without having
to modify the ROM code executable (no re-linking is necessary).

The advantages are as follows:
Quick and easy addition of new applications
Save on expensive EEPROM when adding new applications
Hold on to previously obtained certifications.
Multi-purpose cards (cohabitation of operating systems)

Thanks to a set of well-defined and previously validated interfaces, the jTOP core has the ability
to cohabit with native operating systems. This unique feature allows to build dual or even
multi-purpose cards powered with a Java? engine (Trusted Logic’s jTOP) and a partner Operating
System.

The VISTA card is the world most outstanding reference in this field (Visa Infineon Sony Trusted
Logic Alliance).

SecurityDefensive Virtual Machine
Dynamic bytecode verification to protect from hardware attacks aimed at modifying the bytecode after
it has been verified. This is a unique Trusted Logic feature.

Built-in Integrity & Confidentiality Mechanisms
Enhanced memory management routines automatically check for integrity and confidentiality of all
sensitive data being handled.

Proven Security Robustness
jTOP has undergone extensive Java Card security tests specifically developed by Trusted Logic to
complement standard test suites.