Cryptography previous year question and answers
29 videos • 1,564 views • by msc mathematics
1
calicut university msc maths 3 rd semester cryptography 2023 questions and its detailed answers
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2
cryptanalysis of the LFSR STREAM CIPHER
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3
(-a) mod m=m-(a mod m)
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4
list all invertible elements|involuntary key|find the number of involuntary keys in Hill cipher,m=2
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5
define strongly universal hash family and PT for such a hash family (X,Y,K,H)|{k ∈ K:hk(x)=y}|=|k|/M
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6
piling up lemma
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7
explain entropy and the redundancy of a natural language
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8
define concave function. show that the function f(x)=x² is concave in the interval (-∞,∞)
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9
decrypt XHPENBDYQ With autokey cipher using k=16
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10
Euler phi function
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11
find the number of keys in the affine cipher over Z30
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12
define shift cypher. encrypt the message "number theory" using shift Cipher with k=9
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13
define synchronous streamcipher, periodic streamcipher and non synchronous streamcipher
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14
write a short note on cryptanalysis
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15
affine Cipher,involutory key. PT k=(a, b) is an involutory key ⟺ a–¹ mod n=a & b(a+1)⇠=0 (mod n)
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16
PT k=(a, b) is an involutory key in affine cipher over Zn ⟺a–¹(mod n)=a & b(a+1)⇠=0 (mod n)
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17
compute π-¹.π(x) 4 1 6 2 7 3 8 5(b) decrypt with m=8.TGEEMNELNNTDROEOAAHDOETCSHAEIRLM
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18
explain cryptanalysis of vignere Cipher
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19
explain the term perfect secrecy
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20
hill cipher |encryptions & decryptions example | no. of 2×2 mtrx (p2 – 1)(p2 –p)|det A ≡ ± 1(mod 26)
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21
define concave function and strictly concave function with example
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22
if a is a matrix over Z26 such that A²=I or A=A-¹. then prove that det A=±1 (mod 26)
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23
prove that the number of 2×2 invertible matrix over Zp is (p-1)(p²-p), where p is prime
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24
describe product cryptosystem.give and example
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25
explain iterated block cipher
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26
define cryptographic hash function
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27
Describe substitution permutation networks(SPN)
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28
explain nested message authentocation codes,how the security of nested mac ensured
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29
explain DES
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