參數(shù)資料
型號(hào): CLRC632
廠商: NXP Semiconductors N.V.
英文描述: Multiple Protocol Contactless Reader IC
中文描述: 多協(xié)議非接觸式讀卡器IC
文件頁數(shù): 137/163頁
文件大?。?/td> 948K
代理商: CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
137
Confidential
19 MIFARE
CLASSIC AUTHENTICATION AND CRYPTO1
19.1 General
The security algorithm implemented in MIFARE
Classic products is called Crypto1. It is based on a
proprietary stream cipher with a key length of 48 bits. To access data of a MIFARE
Classic card, the
knowledge of the according key is necessary. For successful card authentication and subsequent access to
the card’s data stored in the EEPROM, the correct key has to be available in the CL RC632. After a card is
selected as defined in ISO14443A the user may continue with the MIFARE
Classic protocol. In this case it
is mandatory to perform a card authentication. The Crypto1 authentication is a 3-pass authentication. This
procedure is done automatically with the execution of
Authent1-
(see 18.9.3) and the
Authent2-Commands
(see 18.9.4). During the card authentication procedure, the security algorithm is initialised. The
communication with a MIFARE
Classic card following a successful authentication is encrypted.
19.2 Crypto1 Key Handling
During the authentication command the CL RC632 reads the key from the internal key buffer. The key is
always taken from the key buffer. Therefore, the commands for Crypto1 authentication do not require
addressing of a key. The user has to ensure, that the correct key is prepared in the key buffer before the
card authentication is triggered.
The key buffer can be loaded
This is shown in the following figure:
from the E2PROM with the
LoadKeyE2-Command
(see 18.9.1)
directly from the μ-Processor via the FIFO-Buffer with the
LoadKey-Command
(see 18.9.2)
FIFO
E2PROM:
Keys
Key Buffer
Crypto1 Module
WriteE2
Serial Data Stream In
(Plain)
Serial Data Stream Out
(Encrypted)
During
Authent1
From the
μController
LoadKey
LoadKeyE2
.
Figure 19-1: Key Handling: Block Diagram
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