at88sc018 ATMEL Corporation, at88sc018 Datasheet - Page 19

• Manufacturer Part Number: at88sc018
• Description: Cryptocompanion? Chip For Cryptomemory And Cryptorf
• Manufacturer: ATMEL Corporation

3.5.
3.6.
5277C–CryptoCompanion–9/09
After execution of Auth_1, the next command must be Auth_2. If it is not, the AT88SC018 locks up for some time. See
Section 1.6.3.
Table 21.
Table 22.
Auth_2
Receives the output of the CRF authentication command and verifies that the CRF chip has knowledge of G. See
Section 2.2
If the incoming Ci
The authentication times out when a delay of 1 second expire, at this point one must re-authenticate.
Table 23.
Table 24.
EncryptPassword
Compute an encrypted password to be sent to the CRF, using the current state of the crypto engine. This can be run at
any time after the authentication sequence has completed. This command is optional.
Table 25.
Table 26.
C
K
ID
Selector
Q
CH
Ci
Selector
EncPwd
ID
A
A
A
Name
Name
Name
Name
Name
Name
for more details on the authentication algorithm.
Inputs
Outputs
Inputs
Outputs
Inputs
Outputs
A
value is incorrect, the AT88SC018 locks up for some time, see
Size
Size
Size
Size
Size
Size
16
8
8
8
1
8
8
1
3
Authentication response from CRF to the AT88SC018, second half of mutual authentication
Initial cryptogram seed from CRF
Constant value to be included in G calculation.
Serial number from which G is calculated. Referred to as Nc in CRF documentation.
Selects one of the F values from the EEPROM to be used for authentication.
Random number input to authentication sequence
Authentication challenge from Cmc to CRF.
Which password to use
Encrypted password to be sent to CRF.
Description
Description
Description
Description
Description
Description
CryptoCompanion Chip
Section 1.6.3.
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