Abstract: A synchronous data-stream generator, suitable for use as a synchronous stream cipher providing copy right protection for audio/video data, generates a stream of output data items in synchronisation with a clock trigger. The data-stream generator comprises at least two parallel arranged subgenerators Mi, i?1, such as linear feedback shift registers. The output of the subgenerators Mi is combined forming the output data items of the data-stream generator. A control subgenerator C is used for generating a stream of control data items. Control means (150) comprises for at least one subgenerator Mi an associated number selector Si for, in dependence on the control data item of the control subgenerator C, selecting a number ni,j from a group Hi of different integer numbers. At least two numbers of the group Hi are larger than zero.

Abstract: A synchronous data-stream generator, suitable for use as a synchronous stream cipher providing copy right protection for audio/video data, generates a stream of output data items in synchronisation with a clock trigger. The data-stream generator comprises at least two parallel arranged subgenerators Mi, i≧1, such as linear feedback shift registers. The output of the subgenerators Mi is combined forming the output data items of the data-stream generator. A control subgenerator C is used for generating a stream of control data items. Control means (150) comprises for at least one subgenerator Mi an associated number selector Si for, in dependence on the control data item of the control subgenerator C, selecting a number ni,j from a group Hi of different integer numbers. At least two numbers of the group Hi are larger than zero.

Abstract: A synchronous data-stream generator, suitable for use as a synchronous stream cipher providing copy right protection for audio/video data, generates a stream of output data items in synchronisation with a clock trigger. The data-stream generator comprises at least two parallel arranged subgenerators Mi, i≧1, such as linear feedback shift registers. The output of the subgenerators Mi is combined forming the output data items of the data-stream generator. A control subgenerator C is used for generating a stream of control data items. Control means (150) comprises for at least one subgenerator Mi an associated number selector Si for, in dependence on the control data item of the control subgenerator C, selecting a number ni,j from a group Hi of different integer numbers. At least two numbers of the group Hi are larger than zero.

Abstract: Cover for a waste container consisting of a cover plate (3) with peripheral wall which fits onto the standing upper rim (2) of the container, in which cover plate is recessed a circular opening (4) which is closable by a circular lid (7), wherein an outer peripheral wall of the lid and the inner periphery of the recess have co-acting cams for locking the lid in the recess, wherein the cams (23, 24, 60, 62) are disposed in different levels or are elongate and are disposed sloping relative to the line of symmetry of the lid such that an opening is formed between the one end of a cam and the other end of the adjacent cam, which opening serves for passage of the co-acting cam, wherein the axially oriented lower surface of the one cam in addition to the opposite axial surface of the other co-acting cam have indentations for defining different closing positions of the lid in the cover plate, whereby one or more intermediate positions of the lid in which the lid can be removed, and an end position in which the lid i

Abstract: A method and device for manufacturing in accordance with the blow-moulding process a container with connecting bottom, top and side walls from plastic material, wherein a parison B is arranged at predetermined temperature in a closable open mould 1, the mould is closed, pressure medium is fed into the parison B and the finished container is removed from the mould after cooling and opening, wherein prior to closing of the mould the parison is held around at least two disc-shaped elements 5,6 which are placed at a mutual interval and which are clamped fixedly between the mould elements when these are closed prior to pressure medium being supplied, and wherein the clamping action is exerted in axial direction of the parison in order to enclose the discs in the bottom and top walls 23 for forming of the container 1, such that the discs lie directly against the top and bottom wall of the container, and an element 31 like a stirring member extending over the full length of the container can be arranged between thes

Abstract: A key stream is generated, and successive keys and instruction words are derived from it. A character is enciphered with a derived key by an enciphering operation determined by the instruction word. A subsequent character is enciphered with the next key derived from the key stream by another enciphering operation determined by the next derived instruction word. Any transmission errors which may occur in the enciphered characters do not propagate, resulting in effective enciphering and reliable deciphering.

Abstract: System of orthogonal code generators, where a first code generator (1) generates a code sequence from a running counter reading (2) which sequence is different from the code generated by a second code generator (1') directed by the same counter reading. Each code generator comprises a number of individually arranged and counter-reading directed subcode generators (3.i), each generating a subcode (g.sub.i) together representing the code, where at least one subcode generator 3.i of the first code generator (1) generates a subcode (g.sub.i) which is different from the subcode g.sub.i ' of the similarly arranged subcode generator (3.i') of the second code generator (1').

Abstract: In a system for storing and distributing keys for cryptographically protected communication each terminal (T.sub.i) must be provided with keys. If the system comprises many terminals (T.sub.i) each terminal must have a large memory capacity therefor. According to the invention, the terminals are combined in groups (A.sub.1, A.sub.2) optionally groups of such groups (B.sub.1) being formed. By assigning, in each group, keys (g, s) to the terminals belonging to the grop (G, S) the quantity of keys to be stored in each terminal can be significantly reduced.

Abstract: In a communication network with cryptographically protected connections a unique key is used for each connection between two subscribers, so that when one or more keys fall into the hands of an unauthorized person it has no consequences for the protection of the remaining connections. In a network comprising N subscribers this implies that each participant must have N-1 keys for communication with the other participants. Such a set of N-1 keys is obtained by putting a column from a N.times.N key matrix (main diagonal empty) at the disposal of each participant. During the connection set-up the correct unique key is automatically selected by interchange of the column number. The key matrices used in the network can be regularly replaced without it being necessary to interrupt the operation of the network.