ATMEL AT88SC0104C, AT88SC25616C User Manual

Applications

• Subscriber Systems (set top boxes)

• Access Control Systems

• Subassembly Authentication

• Removable Storage Devices

• Networked Systems

The new CryptoMemory family of devices in plastic
packages provides secure serial EEPROM storage
for sensitive information within an embedded system.

AT88SC0104C to
AT88SC25616C

FAMILY OF

CRYPTOMEMORY

®

SECURE

SERIAL ICS

C RYPTOGRAPHIC S ECURE ICS C RYPTOM EMORY

®

Key Features

• A Family of Devices with User Memories from 1 Kbit to 256 Kbits: 1K, 2K,

4K, 8K, 16K, 32K, 64K, 128K, 256K

• Symmetrical Dynamic Mutual Authentication with 64-bit Cryptographic Keys

• Encrypted Passwords with Attempts Counters

• Stream Encryption Ensures Data Privacy

• AVR

®

-based Interface Software Available for Easy Implementation

• 1.5 MHz Compatible 2-wire Serial Interface for Fast Operation

• Standard 8-lead SOIC, PDIP and LAP Packages Available, Using the Same

Pinout as Atmel’s AT24Cxx 2-wire Serial EEPROMs

BDTIC www.bdtic.com/Semiconductor

C RYPTOGRAPHIC S ECURE ICSC RYPTOM EMORY

®

Atmel Corporation

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FAX [phone]

Regional Headquarters

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FAX [phone]

e-mail

[e-mail]

Web Site

http://www.atmel.com

© Atmel Corporation 2003. All rights
reserved. Atmel® and combinations thereof
and CryptoMemory®and AVR®are
registered trademarks of Atmel Corporation
or its subsidiaries. Other terms and product
names may be the trademarks of others.

5043A-SMEM-04/03/10K

Atmel contact: [e-mail]

CryptoMemory Cryptographic Security ICs offer a low cost, high security solution for
any embedded application requiring data protection. A proprietary cryptographic
algorithm encrypts data, passwords and checksums, providing a secure place for
storage of sensitive information within a system. With its tamper detection circuits, this
information remains safe even under attack. Whether it is factory configuration data,
user preference data or encryption keys that need to be protected, Atmel’s
CryptoMemory offers a secure solution.

Security

The device includes a proprietary algorithm for encrypting data and passwords and providing a
MAC for read and write operations. Access to data stored in the device is also protected by an
authentication routine. Various security options are available, including four unique key sets for
authentication and eight unique password sets. Encryption is performed using a new session key
each time the device is accessed. The setting of security options along with keys and passwords
is performed by simply writing to a configuration zone in the memory when initial data is loaded
into the device. Atmel’s CryptoMemory family was developed after many years of designing chips
for the smart card marketplace, a market where security is key. The same techniques used to
keep information safe from attack in smart cards is now available to the embedded market.

Communications

CryptoMemory utilizes a common 2-wire serial interface for easy implementation with any
microcontroller. Running at up to 1.5 MHz, this synchronous communications interface ensures
fast operation in any system. With its set of 15 commands, CryptoMemory offers the flexibility to
use any or all of its security features to protect up to 256 Kbits of information.

Implementation

Hardware implementation is easy: CryptoMemory uses the same familiar pinout as Atmel’s
AT24Cxx 2-Wire Serial EEPROMs and is available in standard plastic packages. All memory
densities of CryptoMemory are available in space-saving SOIC and LAP packages as well as
PDIPs. Software implementation requires the CryptoMemory command set and cryptographic
algorithm to be ported into your system’s controller or logic. Full documentation is available under
NDA; for AVR users, a Software Development Toolkit (AT88SC25616C-SDT) is available for easy
integration of CryptoMemory into your system.

Packaging

CryptoMemory circuits are available in standard plastic packages (SOIC, PDIP, LAP) for PC board
assembly with the same pinout as Atmel’s AT24Cxx serial EEPROM family.