AT88SC0808CRF_06 Datasheet, PDF (5/9 Pages) ATMEL Corporation – CryptoRF EEPROM Memory 8 Kbits

AT88SC0808CRF
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 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
Note: 1. Modification Detection Code
2. Message Authentication Code
Data Integrity
Check
MDC⁽¹⁾
MAC⁽²⁾
MAC⁽²⁾
Security Methodology
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.
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5027CS–CRRF–12/06