System comprising: - a dynamic transaction card that includes: - a first EuroPay-MasterCard-Visa (EMV) chip having a secure memory storing a pre-stored private key; - a first microprocessor ; and - a first application ; and - a mobile device that includes: - a second secure memory; and - a second microprocessor ; characterized by - a backend system storing a public key; - wherein the first application , when executed: - transmits , via a Bluetooth or Bluetooth Low Energy (BLE) network , a connection attempt to the mobile device ; - receives , via the Bluetooth or BLE network , an encrypted handshake from the mobile device , wherein the mobile device encrypted the handshake using the downloaded public key, preferably the encrypted handshake comprises a static string of random length and random digits; - decrypts , using the private key and microprocessor , the encrypted handshake and validates the handshake; and - creates , in response to validating the handshake, a Bluetooth or BLE connection between the dynamic transaction card (120, ...) and the mobile device ; - wherein the mobile device is configured to receive login credentials from a mobile device user and to transmit the login credentials to the backend system ; and - wherein the backend system is configured to receive login credentials, and upon validation of the login credentials, to transmit the public key to the mobile device . - a dynamic transaction card that includes: - a first EuroPay-MasterCard-Visa (EMV) chip having a secure memory storing a pre-stored private key; - a first microprocessor ; and - a first application ; and - a first EuroPay-MasterCard-Visa (EMV) chip having a secure memory storing a pre-stored private key; - a first microprocessor ; and - a first application ; and - a mobile device that includes: - a second secure memory; and - a second microprocessor ; characterized by - a second secure memory; and - a second microprocessor ; characterized by - a backend system storing a public key; - wherein the first application , when executed: - transmits , via a Bluetooth or Bluetooth Low Energy (BLE) network , a connection attempt to the mobile device ; - receives , via the Bluetooth or BLE network , an encrypted handshake from the mobile device , wherein the mobile device encrypted the handshake using the downloaded public key, preferably the encrypted handshake comprises a static string of random length and random digits; - decrypts , using the private key and microprocessor , the encrypted handshake and validates the handshake; and - creates , in response to validating the handshake, a Bluetooth or BLE connection between the dynamic transaction card (120, ...) and the mobile device ; - transmits , via a Bluetooth or Bluetooth Low Energy (BLE) network , a connection attempt to the mobile device ; - receives , via the Bluetooth or BLE network , an encrypted handshake from the mobile device , wherein the mobile device encrypted the handshake using the downloaded public key, preferably the encrypted handshake comprises a static string of random length and random digits; - decrypts , using the private key and microprocessor , the encrypted handshake and validates the handshake; and - creates , in response to validating the handshake, a Bluetooth or BLE connection between the dynamic transaction card (120, ...) and the mobile device ; - wherein the mobile device is configured to receive login credentials from a mobile device user and to transmit the login credentials to the backend system ; and - wherein the backend system is configured to receive login credentials, and upon validation of the login credentials, to transmit the public key to the mobile device . <EOS>