AT88SC0204CA-TU Atmel, AT88SC0204CA-TU Datasheet - Page 53
AT88SC0204CA-TU
Manufacturer Part Number
AT88SC0204CA-TU
Description
Manufacturer
Atmel
Datasheet
1.AT88SC0204CA-TU.pdf
(66 pages)
Specifications of AT88SC0204CA-TU
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Mounting
Surface Mount
Pin Count
8
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Compliant
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10.9. Verify CRYPTO: $B8
10.9.1. Functional
52
Figure 34. Verify CRYPTO Command Functional Description
When the device receives the Verify CRYPTO command, it computes a challenge based on the received random
number, Q, the internally stored associated Cryptogram, C
device also increments the associated attempts counter. It then compares the computed challenge with the challenge
sent by the host. If the challenges match, the device computes and writes a new C
success or failure information of the authentication process and updates the authentication attempts counter
accordingly.
Key index:
Data :
Atmel AT88SC0104/0204/0404/0808/CA
8-random bytes
8-challenge bytes
b0000_00nn : Secret Seed G
b0001_00nn : Session Encryption Key S
Q : Host random number, 8-bytes
CH : Host challenge, 8-bytes
Command
Key Index
Host
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
0
-G
3
0
-S
3
Device
i,
and Secret Seed, G
i
(or Session Encryption Key, S
i
and S
i
. The device utilizes the
8664C–CRYPT–01/10
i
). The
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