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| 型號(hào)： | CC2420DK |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LC2MOS 5 O RON SPST Switch; Package: PDIP; No of Pins: 16; Temperature Range: Industrial |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee功能的RF收發(fā)器 |
| 文件頁數(shù)： | 44/87頁 |
| 文件大小： | 1418K |
| 代理商： | CC2420DK |
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SmartRF
CC2420
MAC Security Operations (Encryption and Authentication)
CC2420
features hardware IEEE 802.15.4
MAC security operations. This includes
counter
mode
(CTR)
decryption, CBC-MAC authentication and
CCM encryption + authentication. All
security operations are based on AES
encryption [2] using 128 bit keys. Security
operations are performed within the
transmit and receive FIFOs on a frame
basis.
encryption
/
CC2420
also includes stand-alone AES
encryption, in which one 128 bit plaintext
is encrypted to a 128 bit ciphertext.
The
command strobes are used to start
security operations in
CC2420
as will be
described in the following sections. The
ENC_BUSY
status bit (see Table 5) may be
used to monitor when a security operation
has been completed. Security command
strobes issued while the security engine is
busy will be ignored, and the ongoing
operation will be completed.
SAES
,
STXENC
and
SRXDEC
Table 6 on page 29 shows the
CC2420
RAM memory map, including the security
related data located from addresses
0x100 through 0x15F. RAM access (see
the RAM access section on page 27) is
used to write or read the keys, nonces and
stand-alone buffer. All security related
data is stored little-endian, i.e. the least
significant byte is transferred first over the
SPI interface during RAM read or write
operations.
For a complete description of IEEE
802.15.4 MAC security operations, please
refer to [1].
Keys
All security operations are based on 128
bit keys. The
CC2420
RAM space has
storage space for two individual keys
(KEY0 and KEY1). Transmit, receive and
stand-alone encryption may select one of
these two keys individually in the
SEC_TXKEYSEL
,
SEC_RXKEYSEL
SEC_SAKEYSEL
control bits (
SECCTRL0
).
and
As can be seen from Table 6 on page 29,
KEY0 is located from address 0x100 and
KEY1 from address 0x130.
A way of establishing the keys used for
encryption and authentication must be
decided for each particular application.
IEEE 802.15.4 does not define how this is
done, it is left to the higher layer of the
protocol.
ZigBee
Cryptography (ECC) based approach to
establish keys. For PC based solutions,
more processor intensive solutions such
as Diffie-Hellman may be chosen. Some
applications
may
programmed keys, e.g. for remote keyless
entry where the key and lock are delivered
in pairs. A push-button approach for
loading keys may also be selected.
uses
an
Eliptic
Curve
also
use
pre-
Nonce / counter
The receive and transmit nonces used for
encryption / decryption are located in RAM
from
addresses
0x110
respectively. They are both 16 bytes.
and
0x140
The nonce must be correctly initialized
before receive or transmit CTR or CCM
operations are started. The format of the
nonce is shown in Table 7. The block
counter must be set to 1 for compliance
with [1]. The key sequence counter is
controlled by a layer above the MAC layer.
The frame counter must be increased for
each new frame by the MAC layer. The
source address is the 64 bit IEEE address.
1 byte
8 bytes
4 bytes
1 byte
2 bytes
Flags
Source
Address
Frame
Counter
Key
Sequence
Counter
Block
Counter
Table 7. IEEE 802.15.4 Nonce [1]
The block counter bytes are not updated
in RAM, only in a local copy that is
reloaded for each new in-line security
operation. I.e. the block counter part of the
nonce does not need to be rewritten. The
CC2420
block counter should be set to
0x0001 for compliance with [1].
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 44 of 87
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CC2420EMK | 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 EVALUATION KT (2)PCBs & (2)ANTENNA RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
| CC2420RGZ | 制造商:Texas Instruments 功能描述:IC, RF TXRX, 2400MHZ TO 2483.5MHZ, QLP48; Frequency Min:2.4GHz; Frequency Max:2.4835GHz; Modulation Type:O-QPSK; Receiving Current:18.8mA; Transmitting Current:17.4mA; RF IC Case Style:QLP; No. of Pins:48; Supply Voltage Min:1.6V |
| CC2420RGZR | 制造商:Texas Instruments 功能描述:IC, RF TXRX, 2400MHZ TO 2483.5MHZ, QLP48; Frequency Min:2.4GHz; Frequency Max:2.4835GHz; Modulation Type:O-QPSK; Data Rate:250Kbps; Receiving Current:18.8mA; RF IC Case Style:QLP; No. of Pins:48; Supply Voltage Min:1.6V ;RoHS Compliant: Yes |
| CC2420RGZT | 制造商:Texas Instruments 功能描述:IC RF TXRX ZIGBEE 2.4GHZ 48VQFN |
| CC2420-RTB1 | 功能描述:射頻收發(fā)器 Sgl-Chip 2.4GHz IEEE & ZigBee Ready RF RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
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