at88sc1608 ATMEL Corporation, at88sc1608 Datasheet - Page 2

• Manufacturer Part Number: at88sc1608
• Description: 8 X 256 X 8 Secure Memory With Authentication
• Manufacturer: ATMEL Corporation

Description
2
AT88SC1608
The AT88SC1608 provides 17,408 bits of serial EEPROM memory organized as one
configuration zone of 128 bytes and eight user zones of 256 bytes each. This device is
optimized as a “secure memory” for the smart card market, secure identification for elec-
tronic data transfer, or components in a system, without the requirement of an internal
microprocessor.
The embedded authentication protocol allows the memory and the host to authenticate
each other. When this device is used with a host which incorporates a microcontroller
(e.g., AT89C51, AT89C2051, AT90S1200), the system provides an “anti-wiretapping”
configuration. The device and the host exchange “challenges” issued from a random
generator and verify their values through a specific cryptographic function included in
each part. When both agree on the same result, the access to the memory is permitted.
Figure 1. Security Methodology
COMPUTE Challenge B
Device
VERIFY (WPW)
VERIFY (RPW)
Card Number
Challenge B
Write 0 or 1
Verify A
DATA
COMPUTE Challenge A
Challenge A
VERIFY B
Read Password (RPW)
Write Password (WPW)
DATA
Host (Reader)
0971G–SMEM–04/04