Telefonaktiebolaget Lm Ericsson (publ)

Jari Arrko

Mats Näslund

Karl Norrman

Pekka Nikander

Elena Dubrova

A method () of generating a pseudonym associated with a communication device () is disclosed. The method () is performed in a network node () of a communications system () and comprises generating () a pseudonym embryo based on one or more elements of a sequence (S, S, . . . , S), obtaining () the pseudonym as output of a masking operation applied to the pseudonym embryo, wherein the masking operation comprises a one-to-one mapping, and transmitting () the pseudonym to the communication device (). A corresponding network node (), computer program and computer program product are also disclosed.

Method of generating a pseudonym associated with a communication device, a network node, computer program and computer program product

A method of improving privacy by hiding, in an ordered sequence of messages M[x(), D()], M[x(), D()], etc, communicated between a first and at least one second party sharing a key k, metadata x(i) descriptive of message processing, wherein D(i) denotes payload data. The method comprises the first and the second party agreeing on a pseudo random mapping depending on a shared key k, F, mapping at least x(i) to y(i), and the first party modifying the messages by replacing x(i) by y(i) in each message M(x(i), D(i)). The first party then transmits the modified messages maintaining their original order, and on reception of a message M(y(m), D), the second party uses a mapping Gto retrieve position m of received value and the original value x(m).

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Kauniainen, Finland

Jari Arrko