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55:09 ECS 153, Spring 2021; Lecture #19; May 10, 2021 ECS 153, Spring 2021; Lecture #19; May 10, 2021	ECS 153, Spring 2021; Lecture #19; May 10, 2021 ECS 153 Spring 2021. Computer Security. This covers digital signatures and symmetric key exchange.. The video begins at 5:08 from the beginning. key alice bob session signature ticket keys judge problem kathy party server protocol kerberos replay authentication cryptography thing authenticator couple From Matt Bishop 0 likes 62 plays 0