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For resisting the combinational effect of the chosen-ciphertext attack and DCA-TMNCIC, several improved chaotic cipher schemes are designed, including 3-D SCSC based on a nonlinear nominal system (3-D SCSC-NNS) and [Formula: see text]-D SCSC based on sinusoidal modulation ([Formula: see text]-D SCSC-SM ([Formula: see text])). Theoretical security analysis validates the improved schemes.<\/jats:p>","DOI":"10.1142\/s021812742150142x","type":"journal-article","created":{"date-parts":[[2021,6,28]],"date-time":"2021-06-28T08:18:33Z","timestamp":1624868313000},"page":"2150142","source":"Crossref","is-referenced-by-count":2,"title":["Cryptanalysis of Some Self-Synchronous Chaotic Stream Ciphers and Their Improved Schemes"],"prefix":"10.1142","volume":"31","author":[{"given":"Baoju","family":"Chen","sequence":"first","affiliation":[{"name":"School of Automation, Guangdong University of Technology, Guangzhou 510006, P. R. 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