AT88SC3216CRF-MS1 데이터 시트보기 (PDF) - Atmel Corporation

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AT88SC3216CRF-MS1

13.56 MHz CryptoRF® EEPROM Memory 32 Kbits

Atmel Corporation 

AT88SC3216CRF

6. Communication Security

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 acti-

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

encryption activation, following a successful authentication.

Table 6-1. Configuration Security Modes

Mode

Standard

Authentication

Encryption

User Data

clear

clear

encrypted

Passwords

clear

encrypted

encrypted

Data Integrity

Check

MDC(1)

MAC(2)

MAC(2)

Notes: 1. Modification Detection Code

2. Message Authentication Code

6.1 Security Methodology

Figure 6-1. 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

6.2 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. A bidirectional secure checksum

may be used to certify data authenticity. 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

5005DS–CRRF–04/09

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