| CPC G06F 21/608 (2013.01) [G06F 21/36 (2013.01); G06F 21/602 (2013.01)] | 15 Claims |

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1. A method of operating a printing system comprising at least one printing server and at least one printing device communicatively connectable to the printing server, comprising:
obtaining, by the printing server, a print job encrypted with a public print job key of a print job key pair from a computer device communicatively connectable to the printing server,
receiving, by the printing server, a private print job key of the print job key pair encrypted with a public printing device key of a printing device key pair from a mobile user terminal,
wherein the printing device key pair is associated with the printing device,
transmitting, by the printing server, the received encrypted private print job key to the printing device, and
transmitting, by the printing server, the received encrypted print job to the printing device for printing of the print job by the printing device.
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