DS1425 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1425

Multi iButton

Dallas Semiconductor -> Maxim Integrated 

DS1425

If the DS1425 is presented with a valid password from

the host application, the contents of the secure data will

be returned. However, if the DS1425 is presented with

an invalid password, the on–board intelligent response

generator will return what seems to be a normal

response, but is not. The false response will be unique

to the false access.

By using seemingly random data in both the password

and secure data fields, and by generating many false

accesses for each valid access, even sophisticated

attackers are defeated.

DS1425 MULTI iButton ORGANIZATION Figure 1

8-BIT CRC CODE

48-BIT SERIAL NUMBER

FAMILY CODE 82H

10000010

Secure

Key 0

Secure

Key 1

Secure

Key 2

Scratchpad

512 bits

ID 0

Password 0

Secure Data 0

384 bits

64 bits

64 bits

ID 1

Password 1

Secure Data 1

384 bits

ID 2

Password 2

Secure Data 2

384 bits

64 bits

64 bits

64 bits

64 bits

021798 2/2

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