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參數(shù)資料
| 型號： | E5561 |
| 英文描述： | e5561 Advance Information [Updated 4/03. 26 Pages] Read/Write transponder IC for contactless RF identification for highly sophisticated security applications. |
| 中文描述： | e5561推進信息[更新4 / 03。 26頁]讀/寫非接觸式射頻轉(zhuǎn)發(fā)器的高度復(fù)雜的安全應(yīng)用識別芯片。 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大?。?/td> | 410K |
| 代理商： | E5561 |
21
e5561
4699A–RFID–04/03
Initialization
Before using the e5561 in crypto mode, it has to be initialized.
First, the crypto key to be used by the crypto algorithm has to be generated by the key-
generating program. This program guarantees that each crypto key is unique, no other
e5561 has the same key. This key has to be stored in the memory (block 5 - block 8) of
the e5561 via the programming mode. Once the crypto key is locked, it can not be over-
written or read out anymore with direct-access mode.
For correct authentication it is necessary that base station and transponder both use the
same key. Therefore, the base station needs to know which transponder is currently in
the field. Only then, the base station can select the key corresponding to this particular
transponder. For this identification the e5561 sends a string of data after it has been
powered up. This ID code must also be stored in the e5561.
Starting the Authentication
After power-up the various modes (bit rate, encoding) are read out of block 0. Then, the
e5561 transmits the ID code to identify itself. Thereby, the base station can identify the
transponder and knows which crypto key to use. The base station forces the e5561 into
crypto mode by sending the OPcode 01 followed by a 64-bit string, the challenge.
Challenge
The base station generates a 64-bit random number R. This number is the starting value
of the actual encryption algorithm. To improve security, this random number is not sent
directly to the transponder, but is encrypted by means of a part of the crypto key. The
encoded result R' is then transmitted as challenge to the transponder. Once the tran-
sponder has received the encoded random number R', it recovers the random number R
originally generated by the base station. Both devices, the base station as well as the
transponder, then start with the encryption of this number. If the number of received bits
is incorrect, the e5561 leaves the crypto mode and enters read mode immediatly, trans-
mitting the ID code.
Checksum
For verification of the received challenge, the e5561 sends a checksum (representing
the number of 1 of the challenge) with a special pattern in loop until the encryption is fin-
ished (less than 10 ms - optionally 30 ms).
Encryption
For encryption, the optimized high-security algorithm AUT64 is used. The elementary
parts of this 64-bit block cipher are transposition and substitution (Figure 34). For more
detailed information on this algorithm additional documentation is provided. The entire
algorithm AUT64 is executed 24 times. At each of these 8/24 times, another key is gen-
erated out of the crypto key. Therefore, the algorithm keeps changing and a high-
security level is achieved. This is confirmed by statistical analysis.
For more detailed information, the description 'The Encryption Process of the e5561'
can be provided.
Response
The 64-bit result of the algorithm is reduced to 32 bits using logical operations. This 32-
bit response is sent back to the base station for comparison. If the correct keys were
used, the result generated inside the base station is identical to the result sent by the
e5561. The response is transmitted in loop including the terminator until the IC is pow-
ered by the RF field. This gives the base station enough time to check the validation of
the response.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| E5561_06 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Standard Read/Write Crypto Identification IC |
| e5561A-DOW | 功能描述:射頻無線雜項 Encryption w/unique options RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| E5562-00L022-L | 功能描述:以太網(wǎng)和電信連接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 產(chǎn)品:Modular Jacks 性能類別: USOC 代碼:RJ45 位置/觸點數(shù)量: 安裝風格:Through Hole 端口數(shù)量:1 x 1 型式:Female 屏蔽: 電流額定值: 電壓額定值: 觸點電鍍: 外殼材料:Thermoplastic IP 等級: |
| E5562-60L121-L | 功能描述:以太網(wǎng)和電信連接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 產(chǎn)品:Modular Jacks 性能類別: USOC 代碼:RJ45 位置/觸點數(shù)量: 安裝風格:Through Hole 端口數(shù)量:1 x 1 型式:Female 屏蔽: 電流額定值: 電壓額定值: 觸點電鍍: 外殼材料:Thermoplastic IP 等級: |
| E5562-60LU22-L | 功能描述:以太網(wǎng)和電信連接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 產(chǎn)品:Modular Jacks 性能類別: USOC 代碼:RJ45 位置/觸點數(shù)量: 安裝風格:Through Hole 端口數(shù)量:1 x 1 型式:Female 屏蔽: 電流額定值: 電壓額定值: 觸點電鍍: 外殼材料:Thermoplastic IP 等級: |
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