Re: Codebusters C
Posted: February 28th, 2019, 4:42 pm
Sorry mb for not posting earlier.
Find the inverse of the following hill encryption key:
BRA
CEL
ETS
Find the inverse of the following hill encryption key:
BRA
CEL
ETS
Page 10 of 14
Re: Codebusters C
Posted: March 1st, 2019, 3:54 pm
Can someone give me tips on solving patristocrats????
Re: Codebusters C
Posted: March 1st, 2019, 7:08 pm
Hey guys,
I was just wondering if any of you guys could help me with the Hill Cipher, both decryption and encryption?
For encryption, how do you make an encryption matrix given plaintext- ciphertext letter pairs?
For decryption, how do you make a decryption matrix given plaintext-ciphertext letter pairs? Also, how do you decrypt when given a key and some ciphertext? Lastly, what if they ask you to produce a decryption matrix given only some plaintext (with number values all arranged in a matrix)? I was asking because at the Regionals test for my school, a couple of Hill Cipher questions where you had to produce A (the other one was THE) decryption matrix showed up, and we had no idea on how to do them.
If you guys could try to help, I would very much appreciate that!
I was just wondering if any of you guys could help me with the Hill Cipher, both decryption and encryption?
For encryption, how do you make an encryption matrix given plaintext- ciphertext letter pairs?
For decryption, how do you make a decryption matrix given plaintext-ciphertext letter pairs? Also, how do you decrypt when given a key and some ciphertext? Lastly, what if they ask you to produce a decryption matrix given only some plaintext (with number values all arranged in a matrix)? I was asking because at the Regionals test for my school, a couple of Hill Cipher questions where you had to produce A (the other one was THE) decryption matrix showed up, and we had no idea on how to do them.
If you guys could try to help, I would very much appreciate that!
Re: Codebusters C
Posted: March 1st, 2019, 7:20 pm
CongminhTran wrote:Hey guys,
I was just wondering if any of you guys could help me with the Hill Cipher, both decryption and encryption?
For encryption, how do you make an encryption matrix given plaintext- ciphertext letter pairs?
For decryption, how do you make a decryption matrix given plaintext-ciphertext letter pairs? Also, how do you decrypt when given a key and some ciphertext? Lastly, what if they ask you to produce a decryption matrix given only some plaintext (with number values all arranged in a matrix)? I was asking because at the Regionals test for my school, a couple of Hill Cipher questions where you had to produce A (the other one was THE) decryption matrix showed up, and we had no idea on how to do them.
If you guys could try to help, I would very much appreciate that!
These should go under the Code Busters thread under "Lab Events".KITN1931 wrote:Can someone give me tips on solving patristocrats????
Re: Codebusters C
Posted: March 12th, 2019, 10:26 pm
This year's rules doesn't cover inverting 3x3 hill keys.TheWood wrote:Sorry mb for not posting earlier.
Find the inverse of the following hill encryption key:
BRA
CEL
ETS
However it should be
HUV SIL EDE
ADELE DEALT DEREK LAMPS DATED AS THE BLUNT CELLO DEALT FREED ACTORS GETS A DEATH FLYER EAGLE A YEAR YELLS OFTEN A ROAD
The first 4 letters in the ciphertext is "real"
Re: Codebusters C
Posted: March 14th, 2019, 8:07 pm
Name wrote: (I kinda stole this question, but I really liked the way they presented the Bacon cipher)
ADELE DEALT DEREK LAMPS DATED AS THE BLUNT CELLO DEALT FREED ACTORS GETS A DEATH FLYER EAGLE A YEAR YELLS OFTEN A ROAD
The first 4 letters in the ciphertext is "real"
Hmmm... KINDA...
REALITY BEATS FANTASY
Re: Codebusters C
Posted: March 14th, 2019, 8:37 pm
Yup and oops yeah I did.dragonfruit35 wrote:Name wrote: (I kinda stole this question, but I really liked the way they presented the Bacon cipher)
ADELE DEALT DEREK LAMPS DATED AS THE BLUNT CELLO DEALT FREED ACTORS GETS A DEATH FLYER EAGLE A YEAR YELLS OFTEN A ROAD
The first 4 letters in the ciphertext is "real"
Hmmm... KINDA...
PS: I think you added an extra "S" at the end of ACTORS, because that makes six letters in the group.REALITY BEATS FANTASY
Re: Codebusters C
Posted: March 15th, 2019, 11:28 am
Decode this Vigenere-encrypted text where the five-letter key saved physicists from using Coulomb’s law infinitely for the rest of their lives.
zhy w-xoefv wwuudk felg atscvw g cifvacngj zhul ay ih klgtcu wwucdahrcme
zhy w-xoefv wwuudk felg atscvw g cifvacngj zhul ay ih klgtcu wwucdahrcme
The word “e-field” is part of the plaintext.
The key is GAUSS.
Re: Codebusters C
Posted: March 16th, 2019, 7:02 pm
the e-field equals zero inside a conductor that is in static equilibrium
Re: Codebusters C
Posted: March 17th, 2019, 7:19 am
Correct! Your turn.starfruit wrote:the e-field equals zero inside a conductor that is in static equilibrium