Viruses in TCBs

v

v

v

v

v

v

v

v

v

v

P1

P1

P1

P1

P2

P2

P2

P2

P3

P3

P3

P3

P4

P4

P4

P4

Corruption over time

TS

S

C

U

• Information only flows up

• RACF/ACF2/Top Secret

• "Bell LaPadula model"

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