AT88SC3216C ATMEL [ATMEL Corporation], AT88SC3216C Datasheet - Page 14

• Manufacturer Part Number: AT88SC3216C
• Description: CryptoMemory 32 Kbit
• Manufacturer: ATMEL [ATMEL Corporation]

12.
12.1.
14
Password Verification
Passwords may be used to protect read and/or write access of any user zone. When a valid password is presented, it
is memorized and active until power is turned off, unless a new password is presented or RST becomes active. There
are eight password sets that may be used to protect any user zone. Only one password is active at a time, but write
passwords give read access also.
Authentication Protocol
The access to a user zone may be protected by an authentication protocol. Any one of four keys may be selected to
use with a user zone.
The authentication success is memorized and active as long as the chip is powered, unless a new authentication is
initialized or RST becomes active. If the new authentication request is not validated, the card loses its previous
authentication and it should be presented again. Only the last request is memorized.
Note:
Figure 13.
AT88SC3216C
COMPUTE Challenge B
Password and authentication may be presented at any time and in any order. If the trials limit has been
reached (after four consecutive incorrect attempts), the password verification or authentication process will not
be taken into account.
Device (Card)
Password and Authentication Operations
Checksum (CS)
VERIFY WPW
VERIFY RPW
Card Number
Challenge B
VERIFY CS
Write DATA
VERIFY A
DATA
AUTHENTICATION
WRITE ACCESS
READ ACCESS
COMPUTE Challenge A
Challenge A
VERIFY B
Read Password (RPW)
VERIFY CS
Write Password (WPW)
DATA
CS
Host (Reader)
5014KS–SMEM–08/09