RFID UHF tag formats for libraries

as supported by BookWaves

EPC Memory

BlockBytes (Hex)Description
EPC-CRC
2C
A8
CRC (calculated on-chip)
EPC-PC
40
00
RFID Meta Info (fixed)
EPC-DATA
Library Sigle (URN Code 40 enc)
Decoded: DE290
Media Number
Decoded: 123456789
Bitflags (e.g. security bit)
Status: secured (in library)
Library/Media Data (editable)
RES
Kill Password: loading...
Access Password: loading...
Using 12 bytes for password calculation
How passwords are calculated
  1. Take the first 12 bytes from the EPC-DATA field
  2. Combine these bytes with the provided secret key (kill key or access key)
  3. Calculate a SHA-512 hash of this combined value
  4. Take the first 4 bytes (32 bits) of the resulting hash
  5. This becomes the password (represented as an 8-character hex string)

Security note: Passwords are derived on-demand and rely on the secrecy of your keys

RES (calculated)
TID
E2
80
68
94
20
88
EF
DC
4E
83
28
DC
Tag ID (unique, unchangable)