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# Class Note for CSCI 283 with Professor Vora at GW

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This 1 page Class Notes was uploaded by an elite notetaker on Saturday February 7, 2015. The Class Notes belongs to a course at George Washington University taught by a professor in Fall. Since its upload, it has received 24 views.

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Date Created: 02/07/15
CSCI 283 Computer Security I Fall 2003 George Washington University Descrarnbling number theory and examples of the use of cryptography 17 September 2003 A i Encrypt the following message using scrambling with a column length of 4 HOW MANY MlLES MUST A MAN WALK ON BEFORE HE CAN CALL HIMSELF MAN ii How would you decrypt the message B Perform the following mathematical operations using modular arithmetic i 5 4 mod 6 ii 5 6 mod 7 iii 3 x 9 mod 5 iV 15 3 mod 16 V 33 mod 7 Vi 2 mod 7 C Calculate 537 mod 7 efficiently How many multiplications did you need D Write down the sequence of steps in a digital signature creation and veri cation E How does a replay attack work when Alice and Bob obtain session keys from a KDC as described in class F Write down the sequence of steps in a public key authentication protocol G You are to design the cryptographic protocols for a system for copyright protection using what you have learnt in this class Design the entire system and describe it concisely

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