Method for programming banking data in an integrated circuit of a watch

A method for programming confidential or secure data including banking data, in an application-specific integrated circuit of a portable object including a watch, using an asymmetric encryption/decryption algorithm to perform the programming, the method comprising:

• storing, by the integrated circuit, a public key and a private key of the integrated circuit,
• transmitting the public key of the integrated circuit to a certification authority,
• receiving a digital certificate of the integrated circuit from the certification authority, wherein the digital certificate is generated by the certification authority based on a private key of the certification authority and the public key of the integrated circuit transmitted to the certification authority,
• transmitting the public key of the integrated circuit and the digital certificate of the integrated circuit from the portable object to a financial or banking institution,
• wherein the digital certificate is validated by the financial or banking institution using a public key of the certification authority, and
• when the digital certificate is validated,
• receiving encrypted confidential or secure data from the financial or banking institution to the portable object, wherein the confidential or secure data is personalized to an owner of the portable object and the encrypted confidential or secure data is encrypted using the public key of the integrated circuit, and
• decrypting, by the integrated circuit of the portable object, the received encrypted confidential or secure data using the private key of the integrated circuit to store the decrypted received confidential or secure data, and
• deleting, from the integrated circuit after storing the decrypted confidential or secure data, the private and public key of the integrated circuit and the digital certificate.