Abstract: A provider device provides an app to a user device, creates a first user-specific signature that incorporates user information and a first incremented value, and stores the first user-specific signature in a user-specific registry. The app receives request information, adds an app-sequenced incremented value to the request information to produce request data, and sends the request data to the provider device. The provider device calculates an expected incremented value. The provider device determines the validity of the request data by comparing at least the app-sequenced incremented value with the expected incremented value and processes the request information if the request data is valid. The provider device then creates an incremented user-specific signature that incorporates the user information and the app-sequenced incremented value and adds the incremented user-specific signature to the user-specific registry.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, the user device encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and user devices independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes. This decryption is performed using one-time-use encryption keys produced using sequencers maintained by the intermediate entity, and this decryption generates an authorization request.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, the user device encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and user devices independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes. This decryption is performed using one-time-use encryption keys produced using sequencers maintained by the intermediate entity, and this decryption generates an authorization request.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, the user device encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and user devices independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes. This decryption is performed using one-time-use encryption keys produced using sequencers maintained by the intermediate entity, and this decryption generates an authorization request.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, the user device encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and user devices independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes. This decryption is performed using one-time-use encryption keys produced using sequencers maintained by the intermediate entity, and this decryption generates an authorization request.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, the user device encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and user devices independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes. This decryption is performed using one-time-use encryption keys produced using sequencers maintained by the intermediate entity, and this decryption generates an authorization request.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, a provider institution app encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and provider institution app independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes using one-time-use encryption keys produced using sequencers maintained by the intermediate entity. This decryption generates an authorization request.

Abstract: A system and method facilitating purchase transactions over a computer network, including the purchase of electronically storable items. The embodiments herein encrypt “customer identifier string” in an encryption stream and cause the encryption stream to be transferred from the customer to a merchant in the purchase transaction. A verification entity receives the encryption stream which is sent by the merchant for identity verification and payment authorization. Then, the verification entity verifies the identifiers contained in the encryption stream and transfers an identity verification and payment authorization from the verification entity to the merchant.

Abstract: A registered provider device encrypts provider input related to a transaction between the provider device and one of many registered user devices to create an encrypted one-time-use provider code (the encryption is performed using an encryption key produced, in part, using a uniquely sequenced number generated by a sequencer maintained by the provider device). Similarly, a provider institution app encrypts user input to create an encrypted one-time-use user code using an encryption key produced, in part, using a uniquely sequenced number generated by a user sequencer maintained by the user device. The provider and provider institution app independently transmit their different encrypted one-time-use codes to an intermediate entity, which decrypts the encrypted codes using one-time-use encryption keys produced using sequencers maintained by the intermediate entity. This decryption generates an authorization request.