To check the data encryption key and encryption algorithm, send the 81-04 command with the data 05 first (see screenshot below for steps):
Then refer to the NEO IDG excerpt below for the response data definition:
For example, the response highlighted in the screenshot above for the data key slot (05) is 01443054453030:
01: a valid key exists in key slot 5 which is the data encryption key
4430: this is "D0" in ASCII means the key is used to encrypt data
54: This is "T" in ASCII means the reader is on the TDES encryption algorithm
45: This is "E" in ASCII means the key is for Encryption only
3030: This is "00" in ASCII means the key version number is not used
This method applies to all NEO products
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