Multilevel Diversity Coding with Secure Regeneration: Separate Coding Achieves the MBR Point

Multilevel Diversity Coding with Secure Regeneration: Separate Coding Achieves the MBR Point

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The problem of multilevel diversity coding with secure regeneration (MDC-SR) is considered, which includes the problems of multilevel diversity coding redken blondage conditioner with regeneration (MDC-R) and secure regenerating code (SRC) as special cases.Two outer bounds are established, showing that separate coding can achieve the minimum-bandwidth-regeneration (MBR) point of the achievable normalized storage-capacity repair-bandwidth trade-off regions for the general MDC-SR problem.The core of the new converse results is an exchange lemma, which ialoral can be established using Han’s subset inequality.