The answer to the question "Are log records personal data?" under the KVKK is an emphatic yes. Any IP address, MAC address, username, email, or mobile phone number that appears inside a log entry is treated as personal data.
This means your logging infrastructure is subject to KVKK obligations. Log management platforms like SignLogger must be designed to meet them.
Personal Data Found in Log Records
- Identifying: Username, Turkish national ID, email, phone, MAC, IP.
- Behavioral: Pages visited, files downloaded, messages sent.
- Location: Mobile carrier, GeoIP location, AP-based location.
- Device: Browser, OS, screen resolution (fingerprinting).
KVKK Art. 7 — Deletion, Destruction, or Anonymization of Data
Once the purpose of processing has ended, personal data must be disposed of using one of the following methods:
1. Deletion
Blocking access to the data in an irreversible way. A DELETE in the database, an rm on the file system.
Risk: The data may still exist in backups. Backup rotation must be governed as well.
2. Destruction
Physically destroying the storage medium that holds the data (disk shredding, degaussing).
When to use: When a server is decommissioned, or for old backup disks.
3. Anonymization
Instead of erasing the data outright, stripping out identifying information and retaining it for statistical use.
Example: the email "user@company.com" in a user's log records is converted into a one-way identifier such as "user_HASH." This cannot be reversed.
Disposal Policy
Under Art. 5 of the KVKK's "Regulation on the Deletion, Destruction, or Anonymization of Personal Data," every data controller must prepare a personal data retention and disposal policy covering the following:
- Retention periods by data category
- Disposal methods
- Disposal timelines and cycles
- The person responsible for disposal (who)
- The disposal decision (automatic or manual)
- The disposal records that are kept
Where Law No. 5651 and KVKK Art. 7 Collide
Law No. 5651 requires traffic data to be retained for no less than 6 months and no more than 2 years. At the same time, the KVKK prohibits unnecessary retention. The solution:
- Traffic data is kept for the period mandated by Law No. 5651 (e.g., 1 year);
- The moment that period expires, automatic deletion is triggered;
- The data is retained in anonymized form for statistical reporting.
The Data Subject's Deletion Request (KVKK Art. 11)
If a user asks you to delete the records that belong to them from your logging infrastructure:
- The request is assessed within 30 days;
- The data cannot be deleted before the Law No. 5651 obligation ends (a legal exception under KVKK Art. 28);
- A reasoned response is provided;
- When the period expires, the data is deleted automatically and the data subject is notified.
SignLogger's Log + KVKK Compliance Capabilities
Retention Policies
Set retention periods by device, log type, or user. Automatic deletion the moment the period expires.
Pseudonymization
Sensitive fields (IP, email, phone) are hashed and stored within the log. When there is a judicial request, an authorized user can access the raw data.
Audit Trail
Who accessed the log data, when, and with which query is recorded in a separate audit log (evidence of a security measure under KVKK Art. 12).
Automatic Disposal Record
For every deletion, a signed and timestamped record is generated automatically. It can be presented during an audit.
Anonymization Jobs
Traffic data whose Law No. 5651 period has expired is automatically converted into anonymized form and retained for long-term statistics.
For details, see SignLogger features and our KVKK disclosure notice.
The Retention–Disposal Cycle: Implementation Steps
- Classify: Which log category is retained for how long, and on what legal basis? (Law No. 5651 traffic logs: 6 months to 2 years; application logs: according to your own policy.)
- Automate: Disposal cannot be left to human memory — the archive system must automatically delete or anonymize packages once their period expires.
- Document the disposal: Periodic disposal records (what, when, by which method) are among the first documents requested during an audit.
- Don't forget backups: Your disposal policy must cover backup copies as well.
How Anonymization Is Actually Done
Common techniques for removing the personal-data character of logs you want to keep for statistical purposes: zeroing out the last octet of an IP address (masking), converting user identifiers into irreversible digests (hash + salt), and keeping records in aggregated form (daily summaries) rather than individually. The critical point: anonymization must be irreversible; pseudonymization is still personal data under the KVKK.
Integrity: The KVKK Requirement That Gets Overlooked
KVKK Art. 12 also requires you to prevent the unlawful alteration of data. For log records, the technical equivalent of this is timestamping and electronic signatures — meaning the signing infrastructure you build for Law No. 5651 is also part of your KVKK technical measures. For more, see Signed Logs and Timestamping and The Law No. 5651 Logging Obligation.
Frequently Asked Questions
Can I keep expired logs in an archive instead of deleting them?
No — personal data whose reason for retention no longer exists must be disposed of (KVKK Art. 7). Keeping data "just in case it's needed" violates the data minimization principle.
How does SignLogger manage the disposal process?
A retention period is defined for archive packages; expired packages are cleaned up automatically and the operations are recorded. This way, both the Law No. 5651 lower bound and the KVKK upper bound are managed under a single policy.