AT88SA10HS_10 Datasheet, PDF (1/23 Pages) ATMEL Corporation – Atmel CryptoAuthentication Host Security Chip

Features
• Secure key storage to complement Atmel AT88SA100S and Atmel AT88SA102S
Devices
• Superior SHA-256 Hash Algorithm
• Guaranteed Unique 48-bit Serial Number
• High speed single wire interface, optionally shared with client
• Supply Voltage: 2.7 – 5.25V
• 1.8V – 5.5V communications voltage
• <100nA Sleep Current
• 4KV ESD protection
• Multi-level hardware security
• Secure personalization
• Green compliant (exceeds RoHS) 3-pin SOT-23 and 8-pin TSSOP or SOIC packages
Applications
• Consumable device (battery, toner, other supplies) authentication
• Network & Computer Access control
• Authenticated communications for control networks
• Anti-clone authentication for daughter cards
• Physical access control (electronic lock & key)
1. Introduction
The Atmel^® CryptoAuthentication family of chips is the first cost-effective
authentication devices to implement the SHA-256 hash algorithm, which is part of
the latest set of recommended algorithms by the US Government. The 256-bit key
space renders any exhaustive attacks impossible.
The Atmel AT88SA10HS host version of CryptoAuthentication chips is capable of
validating the response coming from the SHA-256 engine within an authentic
CryptoAuthentication client (SA100S or SA102S), even if that response includes
within the computation the serial number of the client. For detailed information on
the cryptographic protocols, algorithm test values and usage models refer to “Atmel
AT88SA100S” and “Atmel AT88SA102S” Datasheets, along with the application
notes dedicated to this product family.
The host CryptoAuthentication performs three separate operations (named HOST0,
HOST1 & HOST2) to implement this validation. The AT88SA10HS chip takes both
the challenge and response as inputs and returns a single Boolean indicating
whether or not the response is valid, in order to prevent the host chip from being
used to model a valid client.
The host system is responsible for generating the random challenge that is sent to
both the client and host CryptoAuthentication devices as AT88SA10HS does not
include a random number generator.
Note:
The chip implements a failsafe internal watchdog timer that forces it into a very low
power mode after a certain time interval regardless of any current activity. System
programming must take this into consideration. Refer to Section 4.5 for more details.
Atmel
CryptoAuthentication
Host Security Chip
Atmel AT88SA10HS
8595F–SMEM–8/10