A method for providing digital security by means of a reconfigurable physical uncloneable function, which comprises a physical system constituted by distributed components arranged to generate a first response when receiving a first challenge at a point of said physical system, characterized by: the step of physically reconfiguring said reconfigurable physical uncloneable function by a reconfiguration unit, which step comprises the step of redistributing said components such that they generate a second response, which differs from said first response, when again applying said first challenge at said point, the physical reconfiguration affecting the physical structure of the reconfigurable physical uncloneable function, wherein said reconfiguring step is conditioned by a step of determining whether or not to perform a reconfiguration, said providing digital security being constituted by providing secure storage of a digital item, the method further comprising the steps of: obtaining a first random key; generating translation data based on said first response of said first challenge in said point and said first random key; encrypting said item with said random key; storing translation data, said first challenge, and said encrypted item; accessing said item prior to the step of reconfiguring the reconfigurable physical uncloneable function, wherein the step of accessing the item comprises the steps of: challenging the reconfigurable physical uncloneable function with said stored challenge; measuring a response corresponding to the stored challenge from the reconfigurable physical uncloneable function; reconstructing said random key using said measured response and said stored translation data; decrypting said stored encrypted item using said reconstructed random key, whereby said item is available for use. the step of physically reconfiguring said reconfigurable physical uncloneable function by a reconfiguration unit, which step comprises the step of redistributing said components such that they generate a second response, which differs from said first response, when again applying said first challenge at said point, the physical reconfiguration affecting the physical structure of the reconfigurable physical uncloneable function, wherein said reconfiguring step is conditioned by a step of determining whether or not to perform a reconfiguration, said providing digital security being constituted by providing secure storage of a digital item, the method further comprising the steps of: obtaining a first random key; generating translation data based on said first response of said first challenge in said point and said first random key; encrypting said item with said random key; storing translation data, said first challenge, and said encrypted item; accessing said item prior to the step of reconfiguring the reconfigurable physical uncloneable function, wherein the step of accessing the item comprises the steps of: challenging the reconfigurable physical uncloneable function with said stored challenge; measuring a response corresponding to the stored challenge from the reconfigurable physical uncloneable function; reconstructing said random key using said measured response and said stored translation data; decrypting said stored encrypted item using said reconstructed random key, whereby said item is available for use. obtaining a first random key; generating translation data based on said first response of said first challenge in said point and said first random key; encrypting said item with said random key; storing translation data, said first challenge, and said encrypted item; accessing said item prior to the step of reconfiguring the reconfigurable physical uncloneable function, wherein the step of accessing the item comprises the steps of: challenging the reconfigurable physical uncloneable function with said stored challenge; measuring a response corresponding to the stored challenge from the reconfigurable physical uncloneable function; reconstructing said random key using said measured response and said stored translation data; decrypting said stored encrypted item using said reconstructed random key, whereby said item is available for use. challenging the reconfigurable physical uncloneable function with said stored challenge; measuring a response corresponding to the stored challenge from the reconfigurable physical uncloneable function; reconstructing said random key using said measured response and said stored translation data; decrypting said stored encrypted item using said reconstructed random key, whereby said item is available for use.