;; anonymization-engine - Clarity 4
;; Data anonymization and de-identification
(define-constant ERR-REQUEST-NOT-FOUND (err u100))
(define-constant ERR-NOT-AUTHORIZED (err u101))
(define-constant ERR-INVALID-TECHNIQUE (err u102))
(define-constant ERR-ALREADY-PROCESSED (err u103))
(define-map anonymization-requests uint
{
requester: principal,
data-hash: (buff 64),
technique: (string-ascii 50),
anonymized-hash: (optional (buff 64)),
privacy-level: (string-ascii 20),
completed-at: (optional uint),
processor: (optional principal),
is-reversible: bool
}
)
(define-map anonymization-techniques uint
{
technique-name: (string-utf8 100),
algorithm-type: (string-ascii 50),
privacy-guarantee: (string-ascii 50),
computational-cost: uint,
is-approved: bool,
created-at: uint
}
)
(define-map de-identification-logs uint
{
original-hash: (buff 64),
anonymized-hash: (buff 64),
technique-id: uint,
fields-removed: (list 20 (string-ascii 50)),
fields-generalized: (list 20 (string-ascii 50)),
processed-at: uint,
processor: principal
}
)
(define-map re-identification-risks uint
{
anonymized-hash: (buff 64),
risk-score: uint,
risk-factors: (list 10 (string-utf8 100)),
assessed-at: uint,
assessed-by: principal,
mitigation-needed: bool
}
)
(define-map privacy-budgets uint
{
data-owner: principal,
total-budget: uint,
consumed-budget: uint,
budget-period: uint,
reset-at: uint
}
)
(define-map k-anonymity-groups uint
{
group-hash: (buff 64),
k-value: uint,
quasi-identifiers: (list 10 (string-ascii 50)),
record-count: uint,
created-at: uint
}
)
(define-data-var request-counter uint u0)
(define-data-var technique-counter uint u0)
(define-data-var log-counter uint u0)
(define-data-var risk-counter uint u0)
(define-data-var budget-counter uint u0)
(define-data-var group-counter uint u0)
(define-public (request-anonymization
(data-hash (buff 64))
(technique (string-ascii 50))
(privacy-level (string-ascii 20))
(is-reversible bool))
(let ((request-id (+ (var-get request-counter) u1)))
(map-set anonymization-requests request-id
{
requester: tx-sender,
data-hash: data-hash,
technique: technique,
anonymized-hash: none,
privacy-level: privacy-level,
completed-at: none,
processor: none,
is-reversible: is-reversible
})
(var-set request-counter request-id)
(ok request-id)))
(define-public (complete-anonymization
(request-id uint)
(anonymized-hash (buff 64)))
(let ((request (unwrap! (map-get? anonymization-requests request-id) ERR-REQUEST-NOT-FOUND)))
(asserts! (is-none (get completed-at request)) ERR-ALREADY-PROCESSED)
(map-set anonymization-requests request-id
(merge request {
anonymized-hash: (some anonymized-hash),
completed-at: (some stacks-block-time),
processor: (some tx-sender)
}))
(ok true)))
(define-public (register-technique
(technique-name (string-utf8 100))
(algorithm-type (string-ascii 50))
(privacy-guarantee (string-ascii 50))
(computational-cost uint))
(let ((technique-id (+ (var-get technique-counter) u1)))
(map-set anonymization-techniques technique-id
{
technique-name: technique-name,
algorithm-type: algorithm-type,
privacy-guarantee: privacy-guarantee,
computational-cost: computational-cost,
is-approved: false,
created-at: stacks-block-time
})
(var-set technique-counter technique-id)
(ok technique-id)))
(define-public (log-de-identification
(original-hash (buff 64))
(anonymized-hash (buff 64))
(technique-id uint)
(fields-removed (list 20 (string-ascii 50)))
(fields-generalized (list 20 (string-ascii 50))))
(let ((log-id (+ (var-get log-counter) u1)))
(map-set de-identification-logs log-id
{
original-hash: original-hash,
anonymized-hash: anonymized-hash,
technique-id: technique-id,
fields-removed: fields-removed,
fields-generalized: fields-generalized,
processed-at: stacks-block-time,
processor: tx-sender
})
(var-set log-counter log-id)
(ok log-id)))
(define-public (assess-re-identification-risk
(anonymized-hash (buff 64))
(risk-score uint)
(risk-factors (list 10 (string-utf8 100)))
(mitigation-needed bool))
(let ((risk-id (+ (var-get risk-counter) u1)))
(map-set re-identification-risks risk-id
{
anonymized-hash: anonymized-hash,
risk-score: risk-score,
risk-factors: risk-factors,
assessed-at: stacks-block-time,
assessed-by: tx-sender,
mitigation-needed: mitigation-needed
})
(var-set risk-counter risk-id)
(ok risk-id)))
(define-public (allocate-privacy-budget
(data-owner principal)
(total-budget uint)
(budget-period uint))
(let ((budget-id (+ (var-get budget-counter) u1)))
(map-set privacy-budgets budget-id
{
data-owner: data-owner,
total-budget: total-budget,
consumed-budget: u0,
budget-period: budget-period,
reset-at: (+ stacks-block-time budget-period)
})
(var-set budget-counter budget-id)
(ok budget-id)))
(define-public (create-k-anonymity-group
(group-hash (buff 64))
(k-value uint)
(quasi-identifiers (list 10 (string-ascii 50)))
(record-count uint))
(let ((group-id (+ (var-get group-counter) u1)))
(map-set k-anonymity-groups group-id
{
group-hash: group-hash,
k-value: k-value,
quasi-identifiers: quasi-identifiers,
record-count: record-count,
created-at: stacks-block-time
})
(var-set group-counter group-id)
(ok group-id)))
(define-public (approve-technique (technique-id uint))
(let ((technique (unwrap! (map-get? anonymization-techniques technique-id) ERR-INVALID-TECHNIQUE)))
(ok (map-set anonymization-techniques technique-id
(merge technique { is-approved: true })))))
(define-read-only (get-request (request-id uint))
(ok (map-get? anonymization-requests request-id)))
(define-read-only (get-technique (technique-id uint))
(ok (map-get? anonymization-techniques technique-id)))
(define-read-only (get-de-identification-log (log-id uint))
(ok (map-get? de-identification-logs log-id)))
(define-read-only (get-risk-assessment (risk-id uint))
(ok (map-get? re-identification-risks risk-id)))
(define-read-only (get-privacy-budget (budget-id uint))
(ok (map-get? privacy-budgets budget-id)))
(define-read-only (get-k-anonymity-group (group-id uint))
(ok (map-get? k-anonymity-groups group-id)))
(define-read-only (calculate-anonymity-strength (k-value uint) (l-diversity uint))
(ok (* k-value l-diversity)))
(define-read-only (validate-requester (requester principal))
(principal-destruct? requester))
(define-read-only (format-request-id (request-id uint))
(ok (int-to-ascii request-id)))
(define-read-only (parse-request-id (id-str (string-ascii 20)))
(string-to-uint? id-str))
(define-read-only (get-bitcoin-block)
(ok burn-block-height))