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Council Regulation (EEC) No 3821/85Show full title
Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport
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[F1 [F25.1. Secure messaging U.K.
[CSM_021] VU-cards data transfers integrity shall be protected through Secure Messaging in accordance with references (ISO/IEC 7816-4) and (ISO/IEC 7816-8).
[CSM_022] When data need to be protected during transfer, a cryptographic checksum data object shall be appended to the data objects sent within the command or the response. The cryptographic checksum shall be verified by the receiver.
[CSM_023] The cryptographic checksum of data sent within a command shall integrate the command header, and all data objects sent (= > CLA = ′0C′, and all data objects shall be encapsulated with tags in which b1 = 1).
[CSM_024] The response status-information bytes shall be protected by a cryptographic checksum when the response contains no data field.
[CSM_025] Cryptographic checksums shall be four bytes long.
The structure of commands and responses when using secure messaging is therefore the following:
The DOs used are a partial set of the Secure Messaging DOs described in ISO/IEC 7816-4:
Tag Mnemonic Meaning ′81′ T PV Plain Value not BER-TLV coded data (to be protected by CC) ′97′ T LE Value of Le in the unsecured command (to be protected by CC) ′99′ T SW Status-Info (to be protected by CC) ′8E′ T CC Cryptographic Checksum ′87′ T PI CG Padding Indicator Byte || Cryptogram (Plain Value not coded in BER-TLV) Given an unsecured command response pair:
Command header Command body CLA INS P1 P2 (L c -field) (Data field) (L e -field) four bytes L bytes, denoted as B 1 to B L Response body Response trailer (Data field) SW1 SW2 L r data bytes two bytes The corresponding secured command response pair is:
Secured command:
Command header (CH) Command body CLA INS P1 P2 (New L c field) (New Data field) (New L e field) ′OC′ Length of new data field T PV L PV PV T LE L LE L e T CC L CC CC ′00′ ′81′ L c Data field ′97′ ′01′ L e ′8E′ ′04′ CC Data to be integrated in checksum = CH || PB || T PV || L PV || PV || T LE || L LE L e || PB
[X1PB = padding bytes (80.. 00) in accordance with ISO-IEC 7816-4 and ISO 9797 method 2]
DOs PV and LE are present only when there is some corresponding data in the unsecured command.
Secured response:
1.Case where response data field is not empty and needs not to be protected for confidentiality:
Response body Response trailer (New data field) new SW1 SW2 T PV L PV PV T CC L CC CC ′81′ L r Data field ′8E′ ′04′ CC Data to be integrated in checksum = T PV || L PV || PV || PB
2.Case where response data field is not empty and needs to be protected for confidentiality:
Response body Response trailer (New data field) new SW1 SW2 T PI CG L PI CG PI CG T CC L CC CC ′87′ PI || CG ′8E′ ′04′ CC Data to be carried by CG: non BER-TLV coded data and padding bytes.
Data to be integrated in checksum = T PI CG || L PI CG || PI CG PB
3.Case where response data field is empty:
Response body Response trailer (New data field) new SW1 SW2 T SW L SW SW T CC L CC CC ′99′ ′02′ New SW1 SW2 ′8E′ ′04′ CC Data to be integrated in checksum = T SW || L SW || SW || PB] ]
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