| CPC G06F 21/35 (2013.01) [G06F 21/43 (2013.01)] | 15 Claims |

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1. An authentication device for authenticating a user of a first electronic device connected to a second electronic device, the first electronic device and the second electronic device being separately portable by the user, the authentication device for authenticating the user of the first electronic device comprising:
an authentication processor; and
a non-transitory computer readable medium comprising authentication instructions stored thereon which when executed by the authentication processor configure the authentication device to:
check by comparing:
a detected value of a relative characteristic parameter of the second electronic device, which is measured relative to a characteristic parameter of the first electronic device,
to a stored value of this relative characteristic parameter of the second electronic device associated with an identifier of the user requesting an authentication, the stored value of the relative characteristic parameter corresponding to the characteristic parameter of the second electronic device measured relative to the characteristic parameter of the first electronic device.
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