Swisscom Ag

Thomas Seiler

Andreas Jarosch

Jarosch Andreas

Ulrich Herrmann

Marc Rubin

Methods and systems are provided for enhancing security of encrypted messages. One or more bits may be selected in an encrypted message, with the one or more bits being selected such that there is no sequence of consecutive bits in the message, having a length that is greater than or equal to a defined threshold value, that is free of bit errors. An adjustment may be applied to the encrypted message prior to transmitting the message to introduce bit errors in the message, with the adjustment being configured to affect the one or more selected bits. The adjustment may include inverting the one or more selected bits. The one or more bits may be selected and/or adjustment may be configured to reduce detectability of an encryption key used in encrypting messages.

Reducing detectability of an encryption key

Methods and systems are provided for reducing detectability of encryption keys, which may be used to encrypt messages transmitted in a network (e.g., between a base station and a mobile station, such as over the air). Random bit errors may be introduced into the messages to artificially lowering transmission quality, thus makes it harder to detect the encryption key from well-known messages. The random bit errors may be introduced by inverting one or more randomly selected bits in the encrypted message prior to transmitting.

Aspects of the present invention relate to a method and systems operable or arranged to reduce detectability of an encryption key used in a communication network to encrypt messages transmitted between a base station and a mobile station over the air. One or more bits are determined in each case at random positions in the messages. Subsequently, random bit errors are generated in the messages in each case by inverting the bits prior to transmitting the message over the air. Introducing random bit errors into the messages corresponds to artificially lowering transmission quality, which makes it harder for an eavesdropper to detect the encryption key from well-known messages, while a legitimate receiver may correct the random bit errors by using conventional forward error correction features.

An insertion device for a cable in an existing pipe network includes a longitudinally stable flexible element that can be inserted into a pipe region of the pipe network, and on which a head part can be placed. The head part can be diverted to pass through regions of bends of the pipe. Placed on the flexible element is a coupling part to which coupling part the cable to be pulled can be coupled. The head part includes a base body having an elongated shape, which can be led from a stretched position into a bent position. The base body includes guide elements by which at least one pulling element is guided that is spaced apart from the bending axis of the base body. One end of the pulling element is held at one end region of the base body, whereas the other end is held at a drivable linear drive that is attached at the other end region of the base body. Disposed at the end region, remote from the flexible element, of the head part are a light source and a camera. With this device, bends, elbows, and branches in an existing pipe network can be passed through in the desired direction without a problem.

Growing community of inventors

Rizenbach, Switzerland

Thomas Seiler