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53:40 ECS 153, Spring 2021; Lecture #16; May 3, 2021 ECS 153, Spring 2021; Lecture #16; May 3, 2021	ECS 153, Spring 2021; Lecture #16; May 3, 2021 ECS 153 Spring 2021. Computer Security. This discusses DRM, RBAC, and begins cryptography. The video begins at 0:31 from the beginning. key role letters content cipher frequencies access roles text apple letter things ciphertext cryptography movie keys server plaintext attack english From Matt Bishop 0 likes 61 plays 0