Secure dual interface and contact PKI smart card controller
1.1 CMOS14 SmartMX family features overview
The CMOS14 SmartMX family members are a modular set of devices featuring:
1.2 CMOS14 SmartMX family properties
The long-established CMOS14 SmartMX family features a significantly enhanced secure smart card IC architecture. Extended instructions for Java and C code, linear addressing, high speed at low power and a universal memory management unit are among many other improvements added to the classic 80C51 core architecture. The technology transfer step from 5-metal layer 0.18 μm to 5-metal layer 0.14 μm CMOS technology offers more advantages in terms of security features, memory resources, crypto coprocessor calculation speed for RSA and ECC as well as availability of secure hardware support for 2-key and 3-key Digital Encryption Standard (DES) and Advanced Encryption Standard (AES) operations.
The contact interface availability, the optional contactless interface and the optional S²C interface enable the easy implementation of native or open platform and multi-application operating systems in market segments such as banking, E-passports, ID cards, Health cards, secure access, Java cards, Near Field Communication (NFC) connectable mobile hand sets as well as Trusted Platform Modules (TPM).
1.3 Naming conventions
1.4.1 FameXE coprocessor
The approved and modular FameXE architecture supports the trend of increasing RSA keys with faster execution speeds as well as Elliptic Curve Cryptography (ECC) based on GF(p) or GF(2n) at best performance. FameXE supports RSA with an operand length of up to 8-kbit (up to 4-kbit with intermediate storage in RAM only).
The FameXE PKI coprocessor supports 192-bit ECC key length that offers the same level of security as 2048-bit RSA. An ECC GF(2n) based signature, using a 163-bit key can be executed in less than 30 ms providing a security level comparable to 1024-bit RSA. The operand size for ECC, supported by FameXE, is only limited by the 2.5 KB size of the FXRAM. FameXE is easy to use and the flexible interface provides programmers with the freedom to implement their own cryptography solutions. A secure and CC EAL5+ certified crypto library providing a large range of required functions will be available for all devices in order to support customers in implementing public key-based solutions.
1.4.2 Triple-DES coprocessor
The DES widely used for symmetric encryption is supported by a dedicated, high performance, highly attack-resistant hardware coprocessor. Single DES and triple-DES, based on two or three DES keys, can be executed within less than 40 μs. Relevant standards (ISO/IEC, ANSI, FIPS) and Message Authentication Code (MAC) are fully supported. A secure crypto library element for DES is available.
1.4.3 AES coprocessor
SmartMX is the first smart card microcontroller platform to provide a dedicated high performance 128-bit parallel processing coprocessor to support secure AES. The implementation is based on FIPS197 as standardized by the National Institute for Standards and Technology (NIST), and supports key lengths of 128-bit, 192-bit, and256-bit with performance levels comparable to DES. AES is the next generation for symmetric data encryption and recommended successor to DES providing a significantly improved security level. A secure crypto library element for AES is available.
1.5 SmartMX interfaces
1.5.1 SmartMX contact interface
Operating in accordance with ISO/IEC 7816, the SmartMX contact interface is supported by a built-in Universal Asynchronous Receiver/Transmitter (UART), which enables data rates of up to 1 Mbit/s allowing for the automatic generation of all typical baud rates and supports transmission protocols T = 0 and T = 1. Up to two additional I/Os are available.
1.5.2 SmartMX contactless interface
The optional contactless interface is fully compatible with ISO/IEC 14443 A as well as NXP Semiconductors field proven MIFARE technology. A dedicated Contactless Interface Unit (CIU) manages and supports communication using data rates up to 848 kbit/s. A true anti-collision method (in accordance with ISO/IEC 14443-3) enables multiple cards to be handled simultaneously.
The optional MIFARE functionality provided in configurations B1 (MIFARE 1K implementation) and B4 (MIFARE 4K implementation) safeguard the interface compatibility with any installed MIFARE infrastructure. The ability to run the MIFARE protocol concurrently with other contactless transmission protocols implemented by the user OS (T=CL or self defined) enables the combination of new services and existing applications based on MIFARE (e.g. ticketing) on a single dual interface controller based smart card.
The MIFARE implementation on the SmartMX makes use of the approved true random number generator and thus is not susceptible to attacks based on the predictability of random numbers. This emulation is separated from the rest of the SmartMX by a firewall that is part of the Common Criteria evaluation.
A tutorial software library for ISO/IEC 14443-3 and ISO/IEC 14443-4 is available to support NXP Semiconductors customers for easy integration of the contactless technology into current system solutions.
1.5.3 SmartMX S²C interface
The S²C interface is intended for use with NXP Semiconductors NFC circuits (e.g. PN511, PN531) in order to configure secure NFC systems, for example in mobile hand sets.
Operated both in Contact mode (ISO/IEC 7816) and in S²C mode, the user defines the final function of the controller chip with its operating system. This allows the same level of security, functionality and flexibility for the contact interface as well as for the S²C interface.
The S²C interface is connected to the internal ISO/IEC 14443 CIU. The CIU handles the demodulation and modulation of the S²C signals which enables full contactless communication via this interface and the NFC IC. As the S²C interface is connected to the CIU the power to the P5CN080 and P5CN144 must be supplied via the VDD and VSS pads in order to use the S²C interface. The S²C interface does not need any software adaptation compared to normal contactless operation.
When connected to the S²C interface of a NFC IC the device is compatible with existing MIFARE reader infrastructure, and the optional emulation modes of MIFARE 1 K or MIFARE 4 K enable fast system integration and backward compatibility to MIFARE based cards. The communication on the S²C interface supports both the ISO/IEC 14443 A part 3 and the ISO/IEC 14443 part 4.
1.6 Security features
SmartMX incorporates a wide range of both inherent and OS-controlled security features as countermeasure against all types of attack. NXP Semiconductors apply their extensive knowledge of chip security, combined with handshaking circuit technology, very dense 5-metal layer 0.14 µm technology, glue logic and active shielding methodology for optimum results in CC EAL5+, EMVCo and other third-party certifications and approvals.
SmartMX Memory Management Unit (MMU), designed to define various memory segments and assign security attributes accordingly, supports a strong firewall concept that keeps different applications separate from each other. Only the System mode has full access privileges to all memory space and on-chip peripherals, in User mode the privileges are limited. User mode restrictions are configurable by software running in System mode.
The SmartMX security features are acknowledged as having outstanding properties by most NXP Semiconductors’ customers. The countermeasures against light attacks are regarded as “best-in-class”.
1.7 Security evaluation and certificates
Hardware security certification in accordance with CC EAL5+ is attained. Also, third-party approval such as EMVCo (VISA, CAST), ZKA and others, depending on the application requirements, are available.
NXP Semiconductors continues to drive forward third-party security evaluations to provide its customers with the relevant information and documentation needed to execute subsequent composite evaluations of implemented applications.
1.8 Security licensing
In addition to the various intellectual properties regarding attack resistance of the NXP Semiconductors’ owned SmartMX family, NXP Semiconductors has obtained a patent license for SPA and DPA countermeasures from Cryptography Research Incorporated (CRI). This license covers both hardware and software countermeasures. It is important to customers that countermeasures within the operation system are covered under this license agreement with CRI. Further details can be obtained on request.
1.9 Optional crypto library
NXP Semiconductors offer an optional crypto library for all family types:
2.1 Standard family features
2.2 Product specific family features
2.3 Security features
2.4 Design-in support
3.1 Application areas