Abstract: A computer-implemented method, according to one embodiment, includes using a first symmetric key to encrypt a first private key of a first asymmetric key pair, and storing the encrypted first private key on a predetermined near-field communication (NFC) tag. The method further includes storing a first public key of the first asymmetric key pair and the first symmetric key on a predetermined central repository, and obtaining an encrypted first message and an encrypted first group key from the central repository. The encrypted first message was encrypted using the first group key, and the encrypted first group key is the first group key encrypted using the first public key. The method further includes using the encrypted first private key stored on the predetermined NFC tag to decrypt the encrypted first message.

Abstract: A computer-implemented method, according to one embodiment, includes using a first symmetric key to encrypt a first private key of a first asymmetric key pair, and storing the encrypted first private key on a predetermined near-field communication (NFC) tag. The method further includes storing a first public key of the first asymmetric key pair and the first symmetric key on a predetermined central repository, and obtaining an encrypted first message and an encrypted first group key from the central repository. The encrypted first message was encrypted using the first group key, and the encrypted first group key is the first group key encrypted using the first public key. The method further includes using the encrypted first private key stored on the predetermined NFC tag to decrypt the encrypted first message.

Abstract: A device and method of use for a versatile fitness bar is disclosed herein. The bar generally is comprised of a main first part member and a main second part member. In other embodiments, the versatile fitness bar is also comprised of releasably attachable weight members. In embodiments, the distal ends of the main first part member and the main second part member are configured to receive and releasably attach weight members. In yet other embodiments, the main first part member and the main second part member are configured at the proximal ends to releasably attach and lock both main first and second part members together. In embodiments, the weight members are configured to also function as dumbbells.