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(a) Using the extended Euclidean algorithm, find the multiplicative inverse of 504 mod 67.
(b) Decrypt the following ciphertext, which has been encrypted using Caesar cipher:
YMNXJ CFRNS FYNTS UFUJW NXVZN YJJFX D
(c) (i) Construct the Playfair matrix (5x5) using the keyword: cryptology
(ii) Encrypt the following plain text using the above matrix: billa bong
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define cryptography
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Question: (a) Describe fully with example the two access control methods available to implement database security. (b) Discuss why database statistics (meta data) provide es
Computer networks is a complex subject due to the given reasons: MANY DIFFERENT TECHNOLOGIES EXIST: The first reason for the complexity of networks is that there are s
Asymmetric Encryption Asymmetric encryption method makes use of two different but related keys and either key can be used to encrypt or decrypt the message. This method is freque
what is computer network?
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