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50:30 ECS 235A Fall Quarter 2021, Lecture 8, October 8,… ECS 235A Fall Quarter 2021, Lecture 8, October 8, 2021	ECS 235A Fall Quarter 2021, Lecture 8, October 8, 2021 This is the video of the eighth lecture. It's crude as I made it from my laptop, as the room has no video recording. We moved to a different room. key bits keys des cipher block ciphertext numbers encryption attack problem couple length result bit confidentiality boxes words reason messages From Matt Bishop 0 likes 22 plays 0
01:00:48 ECS 153, Spring 2021; Lecture #17; May 5, 2021 ECS 153, Spring 2021; Lecture #17; May 5, 2021	ECS 153, Spring 2021; Lecture #17; May 5, 2021 ECS 153 Spring 2021. Computer Security. This covers symmetric key cryptography. The video begins at 7:00 from the beginning. key cipher period text bits des ciphertext keys letters letter bit alphabet block caesar things couple frequency fact length thing From Matt Bishop 0 likes 56 plays 0