AT88SA10HS-SH-T 데이터 시트보기 (PDF) - Atmel Corporation

부품명

상세내역

제조사

AT88SA10HS-SH-T

Atmel CryptoAuthentication Host Security Chip

Atmel Corporation 

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 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. See “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, and 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. See

Section 5.5 for more details.

1.1 Memory Resources

Fuse

Block of 128-fuse bits that can be written through the one wire interface. Fuse[87] has special

meanings. See Section 1.2 for more details. Fuses[88:95] are part of the manufacturer ID value fixed by

Atmel. Fuses[96:127] are part of the serial number programmed by Atmel which is guaranteed to be

unique. See Section 1.3 for more details on the Manufacturing ID and Serial Number.

ROM

Metal mask programmed memory. Unrestricted reads are permitted on the first 64-bits of this array. The

physical ROM will be larger and will contain other information that cannot be read. The following three

fields are stored in the ROM:

ROM MfrID

2-bytes of ROM that specifies part of the manufacturing ID code. This Atmel assigned value is always

the same for all chips of a particular model number. For the AT88SA10HS, this value is 0x2301.

(Appears on the bus: 0x0123), ROM MfrID can be read by accessing ROM bytes 0 and 1 of Address 0.

ROM SN

2-bytes of ROM that can be used to identify chips among others on the wafer. These bits reduce the

number of fuses necessary to construct a unique serial number. The MaskSN is read by accessing

ROM bytes 2 and 3 of Address 0. The serial number can always be read by the system but is never

included in the message digested by the HOST command.

RevNum

4-bytes of ROM that are used by Atmel to identify the model mask and/or design revision of the

AT88SA10HS chip. These bytes can be freely read as the four bytes returned by ROM Address 1;

however, system code should not depend on this value as it may change from time to time.

Atmel AT88SA10HS [DATASHEET]

2

8595G−CRYPTO−9/11

Share Link: