Methods for securing data transmission are provided. Methods include utilizing a plurality of cross-connect tokens. Methods include receiving a communication line validation communication at a source device. Methods include powering a first passive cross-connect token located at the source device. The first passive cross-connect token may draw power from the communication. The first token may generate a first OTSC (“onetime security code”). The first token may transmit the first OTSC to a second token. The first OTSC may power the second token. The second token may validate the first OTSC, and generate a second OTSC. The second token may transmit the second OTSC to a third token. The third token may be located on a target device. The second OTSC may power the third token. The third token may validate the second OTSC, and transmit, upon validation, a communication line validated communication to the source device.