CLRC63201TSLASH0FE datasheet(136/163 Pages) PHILIPS

136 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

136

Confidential

18.9.3 AUTHENT1 COMMAND 0CHEX

18.9.3.1 Overview

Command

Codehex

Action

Arguments and Data

Returned Data

Authent1

Performs the first part of the Crypto1

(MIFARE Classic) card authentication

Card Auth-Command

Card Block Address

Card Serial Number LSB

Card Serial Number Byte1

Card Serial Number Byte2

Card Serial Number MSB

The Authent1-Command is a special Transceive-Command: it takes six argument bytes which are sent to the

card. The card’s response is not forwarded to the µ-Processor, but is used to check the authenticity of the

card and to prove authenticity of the CL RC632 to the card.

The Authent1-Command can be triggered only by the µ-Processor. The sequence of states for this command

is the same as for the Transceive-Command (see 18.4.3).

18.9.4 AUTHENT2 COMMAND 14HEX

18.9.4.1 Overview

Command

Codehex

Action

Arguments and Data

Returned Data

Authent2

Performs the second part of the card

authentication using the Crypto1 algorithm.

The Authent2-Command is a special Transceive-Command. It does not need any argument byte but all

necessary data which has to be sent to the card is assembled by the CL RC632 itself. The card response is

not forwarded to the µ-Processor, but is used to check the authenticity of the card and to prove authenticity

of the CL RC632 to the card.

The Authent2-Command can only be started by the µ-Processor. The logical sequence for this command is

the same as for the Transceive-Command (see 18.4.3).

18.9.4.2 Effect of the Authent2-Command

If the Authent2-Command was successful, authenticity of card and CL RC632 is proved. In this case, the

control bit Crypto1On is set automatically. When bit Crypto1On is set, all further card communication is done

encrypted, using the Crypto1 security algorithm. If the Authent2-Command fails, bit Crypto1On is cleared.

Note: The flag Crypto1On can not be set by the µ-Processor but only through a successfully performed

Authent2-Command. The µ-Processor may clear the bit Crypto1On to continue with plain card

communication.

Note: The Authent2-Command has to be executed immediately after a successful Authent1-Command (see

18.9.3). Furthermore, the keys stored in the key buffer and those on the card have to match.

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