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参数资料
| 型号： | 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推进信息[更新4 / 03。 26页]读/写非接触式射频转发器的高度复杂的安全应用识别芯片。 |
| 文件页数： | 14/26页 |
| 文件大小： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| E5561_06 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Standard Read/Write Crypto Identification IC |
| e5561A-DOW | 功能描述:射频无线杂项 Encryption w/unique options RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| E5562-00L022-L | 功能描述:以太网和电信连接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 产品:Modular Jacks 性能类别: USOC 代码:RJ45 位置/触点数量: 安装风格:Through Hole 端口数量:1 x 1 型式:Female 屏蔽: 电流额定值: 电压额定值: 触点电镀: 外壳材料:Thermoplastic IP 等级: |
| E5562-60L121-L | 功能描述:以太网和电信连接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 产品:Modular Jacks 性能类别: USOC 代码:RJ45 位置/触点数量: 安装风格:Through Hole 端口数量:1 x 1 型式:Female 屏蔽: 电流额定值: 电压额定值: 触点电镀: 外壳材料:Thermoplastic IP 等级: |
| E5562-60LU22-L | 功能描述:以太网和电信连接器 RJ11 6P2C SIDE ENTRY RoHS:否 制造商:Pulse 产品:Modular Jacks 性能类别: USOC 代码:RJ45 位置/触点数量: 安装风格:Through Hole 端口数量:1 x 1 型式:Female 屏蔽: 电流额定值: 电压额定值: 触点电镀: 外壳材料:Thermoplastic IP 等级: |
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