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| Notation | Description |
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| Number of SNs in a cell |
| Number of sensed data items in a time slot |
| Number of encrypted data items in a page |
| Number of leaves of upper tree in a page |
| Query result to a query |
| Digest of hashing |
| OPSE ciphertext of |
| HMAC of |
| , | Size of a page and digest |
| Size of an encrypted data item |
| , | Size of a descendant label and level label |
| height | Height of AI tree |
| Query range |
| Merkle hash tree |
|