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I'm confused about the encryption method of Felica, could any one help me?
I have read both the security target paper and JIS X 6319-4 papers, here are my questions:
1. Read/Writer generates the access key for mutual authentication. Access Key requires area key and service key info. But ATQC command only provides the area key version and service key version instead of the actual keys, then how can the Read/Writer know them?
2. The mutual authenication is encrypted by 3DES, what keys the 3DES used on both sides? Since access key, challenge data 1 & 2 are only created after the authentication.
3. After the mutual authentication, transaction messages are encrypted by DES or 3DES?
Many thanks!!!
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