Offline Transaction System using TOTP

This paper proposes a new system which can be used to make short distance transactions Offline. The method discussed in this paper provides an in depth explanation of the project and how TOTP (Time-Based One Time Password) is used to carry out authentication which is completely offline. This idea is implemented since there is no current system which facilitates offline payments to occur. The project uses various functions such as Hashing (using SHA-1) and Audio QR to ensure security while it works offline. The project employs a QR code which encodes the user’s ID, TOTP token and the amount to be transferred to the receiver. The receiver then scans the QR code and decodes the contents, authenticates the user, checks the balance, if it is sufficient then the transaction occurs successfully. This system can be used in different scenarios such as shopping, travelling, restaurants etc.