Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Why are natural sources of random numbers problematic when used with encryption protocols?
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- Cryptography problem mathematics Suppose Alice and Bob are using a cryptosystem with a 128-bit key, so there are 2128possible keys. Eve is trying a brute-force attack on the system.(a) Suppose it takes 1 day for Eve to try 264 possible keys. At this rate, how long willit take for Eve to try all 2128 keys? (b) Suppose Alice waits 10 years and then buys a computer that is 100 times fasterthan the one she now owns. Will she finish trying all 2128 keys before or after whatshe does in part (a)?arrow_forwardIt is vital to understand the differences between encoding and encryption.arrow_forwardWhile attempting to decipher a short message, assaults on a cipher provide a greater challenge since they are more difficult to break.arrow_forward
- Cypher block chaining and cypher feedback mode may be compared with regards to the number of encryption operations needed to transmit a large file.How much more efficient is one option than the other?arrow_forwardDecrypt: Encryption and decryption are mathematical inverses using the Caesar/Rail Fence Cipher Key is 0x7F in hexidearrow_forwardCryptography: Alice’s modulus is 11292367, her public exponent is e=94321 and her private exponent is d=6327241. Use RSA to sign the message: x=08041115arrow_forward
- Please describe the techniques of Substitution Cipher and Transposition Cipher.arrow_forwardPublic key is 35,17) please no computer answers I neeed to see and understand how it is donearrow_forwardPerform Encryption and decryption using the RSA algorithm for the following: a. p=5; q = 11; e = 3; M = 12 b. p= 3; q = 17; e = 7; M = 2 c. p=7; q = 19; e = 11; M = 5 d. p= 7; q = 13; e = 11; M = 8 e. p= 13; q = 23; e = 5; M = 10arrow_forward
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