AT88SC0104CRF データシートの表示（PDF） - Atmel Corporation

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コンポーネント説明

メーカー

AT88SC0104CRF

13.56 MHz CryptoRF EEPROM Memory 1 Kbits

Atmel Corporation 

AT88SC0104CRF

Communication

Security

Security Methodology

Communication between the PICC and reader operates in three basic modes. Standard

mode is the default mode for the device after power-up and anticollision. Authentication

mode is activated by a successful authentication sequence. Encryption mode is

activated by a successful encryption activation, following a successful authentication.

Table 2. Configuration Security Modes

Mode

User Data

Passwords

Standard

clear

clear

Authentication

clear

encrypted

Encryption

encrypted

encrypted

Notes: 1. Modification Detection Code

2. Message Authentication Code

Data Integrity

Check

MDC(1)

MAC(2)

MAC(2)

Figure 3. Security Methodology

Device (card)

Card Number

VERIFY A

Compute Challenge B

Challenge B

Host (reader)

COMPUTE Challenge A

Challenge A

VERIFY B

Check Password (RPW)

DATA

Checksum (CS)

Check Password (WPW)

VERIFY CS

Write DATA

Read Password (RPW)

VERIFY CS (optional)

Write Password (WPW)

DATA

CS

Memory Access

Depending on the device configuration, the host will carry out the authentication protocol

and/or present different passwords for each operation: read or write. To insure security

between the different user zones (multiapplication card), each zone can use a different

set of passwords. A specific attempts counter for each password and for the

authentication provides protection against systematic attacks.

5

5021CS–CRRF–12/06

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