Updating keys in nagraedit

It imples that the box already knows the cards matching CAM modulus and rsa public key value.

Various boxes, depending on make/model, may use any of the above pre-pair key transfer methods but it could be useful to know which box uses which method.

so the IDEA signature key for encrypting the first 32bytes extracted from the 64 random seek key is BBBBBBBBBBBBBBBBCCCCCAMIDCAM once applied the IDEA encryption we will have the result 16 byte sessionkey..

which will be stored in the receiver flash for a few hours… Now going back to the calculation done before, the receiver decrypted the cmdAencrypted by the card with the RSA primary 96 stored in the card.

in orde to make the card pairing , u need to know the RSA_N BOXKEY IRD NUMBER CARD SERIAL number or CAMID…

then with them all together we can start comunication between the card..

Script – Read DT06/DT08 Code: rs tx 21 C1 01 FE 1F rx tx 21 00 08 A0 CA 00 00 02 12 00 06 55 dl 02 00 rx dl 02 00 tx 21 00 09 A0 CA 00 00 03 22 01 00 1C 7E dl 02 00 rx dl 02 00 mg * mg *** DT06 info *** tx 21 00 09 A0 CA 00 00 03 22 01 06 13 ** dl 02 00 rx mg DT06 response1 dl 02 00 tx 21 40 09 A0 CA 00 00 03 22 01 86 13 ** dl 02 00 rx dl 02 00 mg DT06 response2 mg *** End DT06 info *** mg * mg *** DT08 info *** tx 21 40 09 A0 CA 00 00 03 22 01 08 13 ** dl 02 00 rx mg DT08 response1 dl 02 00 tx 21 00 09 A0 CA 00 00 03 22 01 C8 55 ** dl 02 00 rx dl 02 00 mg DT08 response2 tx 21 40 09 A0 CA 00 00 03 22 01 88 55 ** dl 02 00 rx mg DT08 response3 dl 02 00 mg *** End DT08 info *** ******* Just to clarify : The important bits your looking at are the DT06/DT08 responses (the bits that start with Rx: ) ie RX: 12 00 15 A2 11 08 E0 00 00 00 5E 01 20 00 00 00 00 00 00 00 00 00 90 00 B3 RX: 12 40 15 A2 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00 64 RX: 12 00 15 A2 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00 24 and RX: 12 40 57 A2 53 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00 64 If the responses vary significantly from the above, with the 00’s replaced with some varying data, then its likely your card had the specified tier and is probably using the corresponding pairing method.Later, establish session key (0C datatype on the card): Ird requests 2a data from card. Ird performs some Idea signing (leave it to you to look up 2a/2b routines) Ird comes up with session key from the 2a message sent from Cam. Encrypted 2B = (2B data with 16 byte session idea key) ^ 3 mod Cam N. So this first 32 bytes are extracted from the 64byte random key and will be encryted using the IDEA SIGNATURE key…this key will be generated by the following information Idea Key generation BB BB BB BB BB BB BB BB CC CC CC CC CA MI DC AM BBBBBBBBBBBBBBBB = Boxkey result from F1 xor F2 CCCCCCCC = IRD number from receiver stored in Flash firmware CA MI DC AM = CAM ID or Smart Card serial number converted in HEX, which can also be extracted by simply sending INS CMD to the card..Decrypted dt08 = Idea Decrypt(DT08, Ird_Idea Key) ^ 3 mod Ird N. From the card (this cmd is also the first step of the Session Key negotiation) shortly after the receiver receives this card reply..It checks the ird # and boxkeys in the Decrypted 08 if they match what is on ird, it stores the Cam N in the decrypted 08 in ird memmory. Ird checks for SK exists on the ird, if it does, the dt08 will never be requested/ignored from the card. Ird sends Cmd 07 ECM message with control words encrypted. The ird decrypts the control words with with Idea encryption using the session key established above. and will decrypt it using the Secondary Key which is also 96bytes, this key is build up by using the following information stored in the receivers flash..

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— There are three different pairing methods used N3 boxes presently. The DT06 method transfers a compressed form of an rsa pq keyset from which the CAM public/private rsa keyset and its associated modulus can be derived.

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