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Security of the My Number Card

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The government is working to establish safe usage conditions from both technical and operational perspectives so that all citizens can use My Number Card as a safe and secure. There are also systems that allow temporary suspension of use of My Number Card's function in the event of loss or theft, or reissuance in one week as a general rule.

Procedures for Lost or Stolen My Number Card

1. Temporary Suspension of function

In the event that a smartphone equipped with the My Number Card or electronic certificate is lost or stolen, you can immediately take procedures to temporarily suspend use of the My Number Card function by phone. Please call the My Number comprehensive toll-free number below to inform us of the temporary suspension.

  • My Number General Toll-free: 0120 95 0178
    Please choose number 2 in the voice guidance.

Procedures for temporary suspension are available 24 hours a day, 365 days a year, and some foreign languages are also available.
For details, please check from My Number Card General Site .

2. Reissuance of My Number Card

In the case of loss or theft, you can use the "My Number Card Issuance and Delivery System," which reissues a limited express train ticket within one week as a general rule.

  1. Application for Issuance
    You need to apply for the issuance at the counter of the municipality where you live within 30 days of losing your My Number Card. If you cannot apply for the issuance within the period due to circumstances, please consult with the municipality where you live.
    • Required documents
      • Identity verification documents
      • My Number Card Issuance Application Form (issued at the service counter)
      • Security Code Setting Request Form (to be issued at service counter)
    • Commission
      • The issuance fee of ¥2,000 (¥1,800 if electronic certificate is not required) must be paid at the counter.
  2. Receipt of the reissued My Number Card
    As a general rule, the My Number Card will be delivered to the address on the resident registration in 1 week after the application for issuance of the My Number Card. Because of the simplified registered mail, face-to-face receipt is required.

For details on the "Limited Express Issuance and Delivery System," please check the application method under the Limited Express Issuance and Delivery System (My Number General Site) .

Safety System

Various technologies are applied to the face of the My Number Card and IC chips so that they can be used safely.

Even if the My Number Card is dropped, there is a system to prevent misuse

  • The use of ink that appears to change in two colors depending on the angle from which it is viewed, special processing for displaying a photograph of a person's face, and the use of laser printing make it difficult to forge the face of a ticket.
  • The face of the card is attached with a face photo, so even if it is lost, a third party cannot easily impersonate it.
  • In order to read the information recorded on the IC chip, a 4-digit PIN or face authentication is required. The PIN is locked if it is entered incorrectly a certain number of times, and it cannot be unlocked unless the person in question performs the procedure.

Personal information such as tax and pension will not be stolen just by seeing your My Number

  • Even if you see the 12-digit My Number (Individual Number) on the back of the My Number Card, you cannot retrieve the information or immediately misuse it because the procedure cannot be completed with the My Number alone.

Unauthorized attempts to read information damage the IC chip.

  • If you try to read the information stored in the IC chip illegally, the IC chip is automatically damaged and the information cannot be read.

Only the minimum required information is recorded in the IC chip

  • The IC chips installed in the My Number Card do not contain medical information such as medical history, financial account numbers, or highly private information such as taxes and pensions.

How distributed information management works

  • My Number System is not a "centralized management" system in which the national government can collect, manage, and view all kinds of information in a specific location. It adopts a "distributed management" system in which information necessary for administrative procedures is exchanged only when necessary. It is not a system in which all kinds of information are collected in a specific organization and a common database is created, so information will not leak in a chain.
  • Information is exchanged using codes (encrypted codes) that are different for each government office and that can be matched only within the system. Even in government officials, only the officials who handle the procedures are allowed to access the information necessary for the procedures.

Acquiring Certification for International Security Standards

  • It has acquired the "ISO / IEC15408 certification" which is the international standard of security function evaluation.

Frequently Asked Questions (FAQ)

In the Digital Agency official note "For safe use of My Number Card (My Number Card Q & A) (Digital Agency official note) ," procedures for loss or theft of My Number Card and information on safety mechanisms are posted in FAQ format, so please check it as well.

References