Koninklijke Philips Corporation N.v.

Philips Lighting Holding B.v.

Hendrik Jan Jozef Hubertus Schepers

Alphons Antonius Maria Lambertus Bruekers

James Joseph Anthony McCormack

Paulus Mathias Hubertus Mechtildis Antonius Gorissen

Maarten Peter Bodlaender

Boris Skoric

Leandro Marin

Wicher Ido-Jan Gispen

Paulus Mathias Hubertus Mechtildis Gorissen

Alan Pestrin

Mathias Hubertus Mechtildis Antonius Gorissen

Mina Deng

A system for hiding a change to a set of variables of a program is provided. A value representing means () represents a value wof a variable vof the variables v, v, . . . , v, wherein w is an element of a set W, by means of a representation rwherein r=E(W, &#x3c3;), and ris an element of a set of representations &#x3a9;(w)={E(vv,s)|s&#x2208;&#x3a3;}, wherein &#x3c3;is a state variable that is an element of a set &#x3a3; and that provides a redundancy to the representation rof wand E is a one-to-one cryptographic mapping from W&#xd7;&#x3a3; to a predetermined set. An action representing means () represents an action on values of variables in a subset V' of V by means of an action on V&#x2032; and an action on V\V&#x2032;, to obtain updated representations. The action on V&#x2032; changes the representation rof each variable Vin the set of variables.=(,&#x3c3;)&#x2003;&#x2003;(I)&#x3a9;()={()|&#x2003;&#x2003;(II)&#x2003;&#x2003;(III)

Hiding of a program execution

A secure calculation is performed on at least one input value. The calculation includes a number of operations, with a first operation performed on the input value, and subsequent operations performed on results produced by previous operations. An initial encryption rank is set, based on the number of operations to be performed in the calculation. The input value is encoded, together with the initial encryption rank. The calculation is then performed, such that the first operation is performed on the encoded input value to produce an encoded result, and subsequent operations are performed on respective encoded results produced by previous operations to produce further encoded results. A new encryption rank is set when an operation in the calculation is performed on the encoded input value or on an encoded result produced by a previous operation, such that the encoded result of said operation in the calculation has the new encryption rank. A decoding function provides a useable output value from an encoded result only if the encoded result has an encryption rank that has reached a predefined value.

Computing with encrypted values

A system for cryptographic processing comprises message unit () for providing a first message representation (), wherein the first message representation is a representation of a message. The system comprises key unit () for providing a key representation (), wherein the key representation is an encrypted representation of a first key of a first cryptographic algorithm and a second key of a second cryptographic algorithm, wherein the first cryptographic algorithm is different from the second cryptographic algorithm. The system comprises step unit () for performing a step of the first cryptographic algorithm and a step of the second cryptographic algorithm based on the first message representation () and the key representation, to obtain a second message representation ().

Cryptographic system and method

A physical uncloneable function (PUF) pattern is used for verifying a physical condition of an item. The PUF pattern is arranged to be damaged in the event that said item is exposed to a predetermined environmental condition. Verification of the physical condition of the item, is carried out by obtaining a measured response from the PUF pattern, and comparing the measured response with a stored response in respect of the PUF.

Device, system and method for verifying the authenticity integrity and/or physical condition of an item

A wireless network system () and a method for commissioning a wireless network system () is described. The network system () comprises at least a network device () and a joining device (). In a commissioning mode, the network device () broadcasts network identification information. The joining device () sends, upon reception of the network identification information, a request to said network device () to join the network, comprising a predefined address of said joining device (). The network device () assigns said joining device () a network address and stores corresponding data. The network device () sends joining information comprising at least said network address to said joining device () using said predefined address and said joining device () receives the network address, so that the joining device () is addressable in the network system () using said network address.

Growing community of inventors

Veldhoven, Netherlands

Hendrik Jan Jozef Hubertus Schepers