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BS ISO/IEC 18033-4:2011+A1:2020
Information technology. Security techniques. Encryption algorithms Stream ciphers (British Standard)
ISO/IEC 18033-4:2011 specifies output functions to combine a keystream with plaintext, keystream generators for producing keystream, and object identifiers assigned to dedicated keystream generators in accordance with ISO/IEC 9834.
British Standards Institution [bsi]