Technical Manual

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East Wind Technologies, Inc.

SenssionKey: 16 bytes. The senssion key will be sent back only after a successful

authentication. The senssion key will be used in the following card operations. It is the key to

decrypt the encrypted data in encrypted communication process.

Failure:

Frame

0x6F

Checksum

3.7.1.5 DESFire Authenticate first step Get ekNo (RndB)

Function: Authentication is initiated by the module. Get the ekNo (RndB) from the card.

Host sends:

Frame

0x8E

KeyNo

Checksum

KeyNo: 1 byte.

Success:

Frame

0x8E

Status

ekNo (RndB)

Checksum

Status: status code returned from the card.

Please reference: DESFire Returned State Code.

If the status code is 0xAF, it's correct. The host will offer further data, the following

command must be: DESFire Authenticate second step get ekNo (RndA’) then may go on

authentication.

ekNo (RndB): 8 bytes, the result of random number encrypted by specified key. Use correct

key to decrypt could get the RndB.

Failure:

Frame

0x71

Checksum

3.7.1.6 DESFire Authenticate second step get ekNo (RndA’)

Function: Random number RndA generated by the host. Host encrypte the assembled “RndA

and RndB”, and then send to card and get ekNo (RndA’) from card, decrypte it to get RndA’,

reassemble to obtain RndA, if it is equal to RndA of generated by host, the authentication is

passed.

Host sends:

Frame

0x8F

dkNo (RndA＋RndB’)

Checksum

dkNo(RndA＋RndB’): 16bytes.

Success:

Frame

0x8F

Status

ekNo (RndA’)

Checksum

Status: status code returned from the card.

Please reference: DESFire Returned State Code.

ekNo (RndA’): encrypted host random number. After decrypted with the correct key and

reassemble, if equal to RndA, then the authentication is passed.

Senssion Key: 16 bytes, Combination of RndA and RndB:

Senssion Key = RndA[0..3]＋RndB[0..3]＋RndA[4..7]＋RndB[4..7]

The senssion key will be used in the following card operations. It is the key to decrypt the

encrypted data in encrypted communication process.

Failure:

Frame

0x70

Checksum