The systems and methods herein provide for human- and machine-readable cryptographic keys from dice. In one embodiment, the system places a number of dice into an arrangement to fill a dice grid. The number of dice each contains a number of faces, and each of the faces of the dice includes an image. The system then captures, via a client device, an image of the arrangement. The system generates a cryptographic key from the captured image. This cryptographic key is a human-readable and machine-readable representation of the arrangement in a canonical sequence.

A method of communication, within a processing system of a gas turbine engine, between a first electronic component and a second electronic component, comprising: generating by the first electronic component, a request, comprising a digital certificate, intern comprising a first host public key and a first client public key, signed with a first host private key, to initiate a trusted communication session with a second electronic component; encrypting at the first electronic component, at least a portion of the request with a first client private key; transmitting the request to the second electronic component; the first host private key and the first host public key defining a first asymmetric keypair and the first client private key and the first client public key defining a second asymmetric keypair.

Systems and methods for azimuthal multiplexing using three-dimensional diffractive optics An azimuthal optical multiplexing system includes a light source. The system includes two or more at least partially transparent plates. Each plate of the two or more plates has a structured or patterned surface positioned in an optical path of the light source. The system includes means for rotating at least one plate of the two or more plates axially with respect to at least one other plate of the two or more plates. The means for rotating is operatively coupled to the at least one plate. The structured or patterned surface is configured to modulate light directed along the optical path and through the two or more plates.

Systems and methods for azimuthal multiplexing using three-dimensional diffractive optics An azimuthal optical multiplexing system includes a light source. The system includes two or more at least partially transparent plates. Each plate of the two or more plates has a structured or patterned surface positioned in an optical path of the light source. The system includes means for rotating at least one plate of the two or more plates axially with respect to at least one other plate of the two or more plates. The means for rotating is operatively coupled to the at least one plate. The structured or patterned surface is configured to modulate light directed along the optical path and through the two or more plates.

A data storage device includes a plurality of tiles whose faces are marked with characters. An elongated core is configured to enable slots of the tiles to fit over an openable end of the core to mount the tiles on the core with the marked faces aligned and to slide along the core. The length of the core is sufficient such that tiles of a mounted stack of tiles are slidable away from other tiles of the stack to form a gap that is sufficient to enable reading the character on the tile. A locking element is placeable on the openable end to prevent removal of tiles from the stack, and removable to enable addition of tiles or removal of tiles. A casing is closable over the core and includes a limiting structure to limit sliding of the tiles when the casing is closed.

A data storage device includes a plurality of tiles whose faces are marked with characters. An elongated core is configured to enable slots of the tiles to fit over an openable end of the core to mount the tiles on the core with the marked faces aligned and to slide along the core. The length of the core is sufficient such that tiles of a mounted stack of tiles are slidable away from other tiles of the stack to form a gap that is sufficient to enable reading the character on the tile. A locking element is placeable on the openable end to prevent removal of tiles from the stack, and removable to enable addition of tiles or removal of tiles. A casing is closable over the core and includes a limiting structure to limit sliding of the tiles when the casing is closed.

A modular valuable media recycling device is presented. The valuable media recycling device includes a media infeed module, a validator module, an escrow module, a plurality of media feeder/stacking modules, and a plurality of cassette modules. When a module handles a valuable media item along a media transport path, the module's identifier and security information are passed as a message to a next module that is to handle the media item in a processing path for the media item. Each module independently validates the authenticity of the message received from a previous module. The number of media feeder/stacking modules and cassette modules are scalable based on the transaction terminal that the modular valuable media recycling device is integrated into.

The present invention provides a genuine product authentication method, a genuine product authentication system, and a digital hologram tag generator for a genuine product authentication system, which increases a security level of a digital hologram tag. The computer-generated hologram based-genuine product authentication method, the computer-generated hologram based-genuine product authentication system, and the digital hologram tag generator for a computer-generated hologram based-genuine product authentication system are characterized in that a product unique code is set according to a predetermined rule, and the set product unique code is converted into digital hologram and encrypted according to a specific process, and the encrypted code is decrypted through a decryption process same as the encryption process and compared with the unique code stored in the server, thereby preventing illegal copying and allowing consumers to verify the authenticity very conveniently.

A roller-shaped electronic stamp comprising a plurality of protrusions arranged on a surface of a cylindrical rotational body that rotates around a shaft, wherein a pattern of contact points provided by the plurality of protrusions represents data, and wherein the data is transmitted to an electronic terminal by rolling the surface of the cylindrical rotational body on a touchscreen of the electronic terminal.

A roller-shaped electronic stamp comprising a plurality of protrusions arranged on a surface of a cylindrical rotational body that rotates around a shaft, wherein a pattern of contact points provided by the plurality of protrusions represents data, and wherein the data is transmitted to an electronic terminal by rolling the surface of the cylindrical rotational body on a touchscreen of the electronic terminal.