AT88SC118_14 datasheet, PDF - EEWORLD Datasheet

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AT88SC118_14: DescriptionCryptoCompanion Device for CryptoRF and CryptoMemory Products; File Size272KB，12 Pages; ManufacturerAtmel (Microchip)

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AT88SC118_14 Overview

CryptoCompanion Device for CryptoRF and CryptoMemory Products

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Atmel AT88SC118

CryptoCompanion Device for

CryptoRF and CryptoMemory Products

SUMMARY DATASHEET

Features



Atmel

CryptoCompanion

™

Device to Atmel CryptoRF

and Atmel CryptoMemory

Securely implements Host algorithms



Securely stores Host secrets



Verifies Host firmware digests



High security features in hardware



CryptoMemory and CryptoRF F2 Algorithm

SHA-1 standard cryptographic algorithm

64-bit Mutual Authentication Protocol (Under License of ELVA)

Permanently coded serial numbers

High quality Random Number Generator (RNG)

Metal shield over memory

Data scrambling in nonvolatile memory

Delay penalties to prevent systematic attacks

Reset locking to prevent illegal power cycling

Voltage and frequency monitors

Authentication challenge generation

Device challenge response

Message Authentication Codes (MAC) generation

Data encryption and decryption

Secure authentication key management



Host-side crypto functions



Secure storage and key management

Up to 16 sets of 64-bits diversified Host keys



Eight sets of two 24-bit passwords



Secure and custom personalization



Up to 232-byte Read/Write configurable user data area



Nonvolatile up counters

Four sets unidirectional counters



6.4 million maximum counts per counter



Application features

Low voltage supply: 2.7V – 3.6V



2-Wire Serial Interface (TWI, 5V compatible)



Standard 8-lead SOIC plastic package, green compliant (exceeds RoHS)



High reliability

This is a summary document.

The complete document is

available on the Atmel website

at www.atmel.com.

Endurance: 100,000 cycles



Data retention: 10 years



ESD protection: 3,000V min. HBM



Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013

Product Overview

The CryptoCompanion is designed as the mate to the CryptoRF (CRF) and CryptoMemory (CM) devices, collectively

referred to in the remainder of this document as CRF.

The CryptoCompanion makes extensive use of the SHA-1 hash algorithm as specified in

http://www.itl.nist.gov/fipspubs/fip180-1.htm

and elsewhere. In this document, the nomenclature SHA-1(a, b, c) means to

concatenate a, b, and c in that order and then pad them to a block size of 64 bytes before computing the digest. The

CryptoCompanion does not ever generate a SHA-1 digest of datasets larger than a single round.

1.1

General Operation

The CRF device contains secrets that must be known or derived by a Host system in order to establish a trusted link

between the two and permit communications to happen. The CryptoCompanion stores these secrets in an obscured way

in nonvolatile memory and contains all the circuitry necessary to perform the authentication, password, and

encryption/decryption functions specified in the CRF datasheet. In this manner, the secrets do not ever need to be

revealed.

The general cryptographic strategy is as follows:



Each CRF device has a serial or identification number (ID) and authentication secret G

stored in EEPROM. ID is

freely readable; G

can never be read and is unique for all tags.

The CryptoCompanion contains an EEPROM that contains a set of common secrets (F

). The

AT88SC118 combines F

with ID and K

to compute a value of G that is expected to match that in the CRF

device. Specifically, G = SHA-1(F

, ID, K

G is further diversified by the inclusion of a number (K

) generated by the Host system in a manner of its

choosing. Typically, it will be the result of a cryptographic operation on the CRF ID value calculated using other

data, secrets, and/or algorithms external to the AT88SC118. This permits scenarios that offer varying degrees of

additional security.

The CryptoCompanion includes a general purpose cryptographic quality Random Number Generator which is

used to seed a mutual authentication process between the AT88SC118 and CRF. If the CRF confirms the

CryptoCompanion challenge, and the CryptoCompanion confirms the CRF response, then the Host system

proceeds with CRF operations. In this way, the Host system may use the CRF without knowing the CRF’s secrets

directly.



1.2

CryptoCompanion Benefits

The following is a partial list of the benefits of using this device versus storing the algorithms and secrets in standard

Flash system memory.



Keep confidential those core secrets that are used to authenticate with and communicate to/from CRF.

(Store them in EEPROM and use them on-chip)

Flexible system implementation — multiple secrets and policies for different CRF locations within the system.

Multiple manufacturer setup options.

Hardware encryption engines, avoids algorithm disclosure from reverse-compilation of system operating code.

Full hardware security implementation makes it harder for an attacker (even with lab equipment) to get secrets

stored on the CryptoCompanion.

Global secrets are protected using strong security, standard algorithm (SHA-1).

Implements a crunching algorithm to prevent micro-controller based CRF replicas.

Robust Random Number Generation avoids accidental replay for all cryptographic operations using the system;

not just with respect to CRF.

Secure EEPROM storage for configuration information, etc. may permit reduction in the total BOM for the system.

Easy to use — little programming required, no knowledge of security algorithms or protocols, and fast time to

market.

Atmel AT88SC118 [Summary Datasheet]

Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013

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