IN PYTHON PLEASE $!!!$ Problem $1$: One$-$Time Pad Implementation

Tasks: the encryption and decryption process between two parties, Alice and Bob.

Alice's Program

Should prompt for a message input $($plaintext$),$ then display the ciphertext, and save both the

ciphertext $($in hex$)$ and the key $($in hex$)$ in separate files.

Bob's Program:

Should read the key and ciphertext from their respective files and display the decrypted

plaintext.

Problem $2$: Implementing Many$-$Time Pad

Tasks: Modify the one$-$time pad implementation to encrypt multiple messages with the same key,

simulating a many$-$time pad scenario. The purpose of this problem is to see if there are any

recognizable patterns by observing the outputs. You can gain insights by changing the plaintexts or

the key to verify your findings. These findings would be useful in the next problem.

The program should encrypt a list of $10$ predefined plaintext messages with a single key,

saving the plaintexts, key, and ciphertexts $($all in hex$)$ into a file. You can select $10$ of your

favorite messages. Assume the key is long enough to do encryption to all the $10$ messages.Problem $3$: Cryptanalysis of Many$-$Time Pad

Tasks: Develop a strategy to decrypt messages encrypted with a many$-$time pad. More specifically, assume Eva has collected the $10$ ciphertexts and she knew they are generated by the same key. In addition, all the plaintexts are in English. Space, comma, period, and question mark are being used in the plaintext, but no other special characters are allowed. Eva wants to decrypt the last message $($target message$).$

Collected ciphertexts:

$1)71$fe$1$ace$4389087266117$cd$7$c$98$c$4182851$b$3$acff$3$b$086$e$3$f$83$f$94$d$6$eb$05$c$4$ba$85$d$8$e$1$fa$14$f$11$d$1$c$3$b$568$ff$6$cff$5$c$09$c$5$d$67$ef$5$c$9$c$71$b$7$eeb$3$d$45$a$5154$ab$17$b$83$e$071$ce$9$d$8988$adb$4$afedf$46$a$840$

$2)71$fe$1$ace$559$a$1$e$7266117$cd$7$ce$8745$d$7$be$2$e$74$c$3$f$0$f$68$eeef$57$e$8884$e$607$debf$81$dfa$0$f$012$f$95819681$ae$7$f$29$fe$4839$b$5175$ef$5$e$8760$bef$0$b$9$d$44$b$504$eba$12$b$22$f$5404$f$89$dd$085$d$550$a$48865$a$14$f$9$b$15$a$94$dabe$609$ca$2$df$2$cccf$210$cefdb$1$af$5389719795$e$1$f$0179$cb$77$c$5$c$456954$d$88$f$3$

$3)72$fe$069$c$51$c$81$a$20775928$c$7879$d$4$fd$2$a$93$c$3$acff$3$f$69$fe$5$fe$2$e$9493$a$303$d$9$ea$98$c$4$e$5$b$60$ae$40$a$146058$e$7$c$787$fbd$09$a$1474$e$25$dc$865$b$5$e$6$af$865$d$4$a$40$a$61$bfd$384$e$06$e$0$cfc$1$ccd$356$ff$8853$ac$438905$fa$5$fe$3$fd$41$cb$3$bbc$8$ac$9$

$4)67$e$543885$b$9$a$5$b$2267177084$cf$8453$ccb$8633$ad$7$fdb$39$de$5$b$13$f$8$a$93$a$304$d$6$bf$8$bc$4$f$4$ef$5$def$110$b$6$f$56$a$3$e$186$e$2$c$68$c$1470$ef$5$c$9$c$2$ffbd$6$a$291571$e$40$ba$1$afd$3$b$4$b$1$fe$0$c$4$cbccc$15$df$5$dc$07$b$043$da$01$fa$6$ae$4$fd$158$f$37$b$3$c$0$cd

$5)71$fe$029$a$148$c$1236320$d$7192878$a$59$cfbc$3$a$6$ec$5$e$7$f$68$befb$13196$d$6$ea$1$ec$4$ea$81$d$9$e$3$fe$50$ea$0$f$196$d$02$a$2$f$7$cfe$2$c$29$c$5577$e$35$d$8630$baf$6$ea$80465$b$01$aa$1$abc$394$f$57$a$1$f$4$ccccda$59$ff$8846$e$44$b$8805$bb$5$cabe$608$c$231$f$2$dec$8364$ae$7$d$90$ab$4358$c$5$c$3$a$421$b$06$

$6)6$ef$914$ce$5989152$b$321$a$769$ad$79$c$42$c$7$be$6$f$6$ad$2$fab$19$de$1$fc$339$d$84$f$04$ad$3$a$589$dfa$0$ff$09$ab$0$c$196$f$13$e$7$e$780$b$4$c$097556$ded$57$c$871$fbeea$393464$a$01$aa$0$ab$1381848$cfd$2$d$6898918$efc$046$b$00$b$8940$bb$08$e$3$f$313$cb$23$b$3$dfd$8645$cfcd$80$ff$82489$

$7)71$fe$1$ace$4389087266117$cd$7$c$4865$bd$2$b$93$b$7$fd$2$b$5$a$58$ce$9$f$4308$c$9$ff$01$e$97$ab$82$cbf$2$ef$5$dfc$101$d$6$a$56$b$3$fb$8$ab$4$d$08$b$4167$ef$5$c$9$c$30$b$8$f$0$ab$97455$b$45$e$81$efd$364605$e$49$ddb$83$df$48$eedc$42$b$60$c$900$fb$14$db$4$b$229$ca$74$b$6$c$4$d$96442$e$1$c$34$df$8288$f$5$c$3$a$450$a$527$ecc$7$c$82865$b$8$e

$8)71$fe$029$a$148$c$1437615978$d$7$c$58854$dbec$2$c$75$cde$5$a$39$be$5$e$37$e$9$b$97$ef$0697$a$285$dfa$0$f$01$cff$101$d$764983$f$29$bf$5$

$9)71$fe$1$ace$50875$b$31730$d$6$ad$7$cb$8640$c$7$ec$3$c$73$d$4$e$1$bf$81$e$7$b$13796$d$6$e$518$d$8$a$4988$ceff$05$dff$101$d$2415$a$8$fe$9$fe$1$d$79$a$4623$eb$5$e$8430$bfe$3$b$3$d$442514$faf$40$fd$18420$be$0$c$8$cb$89924$cf$3$cd$5$ee$448950$efd$5$cabe$500$c$120$f$2$d$9$d$26440$ebc$34$de$029811977430$b$01748276$d$79012955$cc$6$a$65$aebb$9054$becda$5$c$9278$

$10)71$fe$029$a$1483123$c$76597691878459$cca$9363$ac$4$faf$68$ceffc$2$e$8$d$82$e$61897$b$98$fc$5$e$5$f$809$e$20$b$0$c$7756$b$2$e$08$aab$83$bc$5560$e$257$

Target Message:

$71$fe$0680149$d