## Codebusters C

Riptide
Exalted Member
Posts: 192
Joined: December 4th, 2017, 7:09 pm
State: TX
Contact:

### Re: Codebusters C

Next question:

Caesar shift, decrypt this questionably translated quote from Albert Camus: "CXMJH, VJVJW MRNM. XA VJHKN HNBCNAMJH; R LJW'C KN BDAN."
`TODAY, MAMAN(?) DIED. OR MAYBE YESTERDAY; I CAN'T BE SURE`
Encode the following word (one letter at a time) using RSA with e = 5 and n = 101.
TREES
UC Berkeley '23
Seven Lakes High School '19

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

### Re: Codebusters C

Next question:

Caesar shift, decrypt this questionably translated quote from Albert Camus: "CXMJH, VJVJW MRNM. XA VJHKN HNBCNAMJH; R LJW'C KN BDAN."
`TODAY, MAMAN(?) DIED. OR MAYBE YESTERDAY; I CAN'T BE SURE`
Encode the following word (one letter at a time) using RSA with e = 5 and n = 101.
TREES
You're right.

Isn't n supposed to be the product of two primes though?
Also, do you want me to use A=0, B=1, C=2, D=3, ..., Z=25 or convert the letters to ASCII code?

Riptide
Exalted Member
Posts: 192
Joined: December 4th, 2017, 7:09 pm
State: TX
Contact:

### Re: Codebusters C

Next question:

Caesar shift, decrypt this questionably translated quote from Albert Camus: "CXMJH, VJVJW MRNM. XA VJHKN HNBCNAMJH; R LJW'C KN BDAN."
`TODAY, MAMAN(?) DIED. OR MAYBE YESTERDAY; I CAN'T BE SURE`
Encode the following word (one letter at a time) using RSA with e = 5 and n = 101.
TREES
You're right.

Isn't n supposed to be the product of two primes though?
Also, do you want me to use A=0, B=1, C=2, D=3, ..., Z=25 or convert the letters to ASCII code?
Yeah my bad I just chose a random n. n=102 should work? (51*2) and yeah just convert the letters directly (A=0, B=1, etc).
UC Berkeley '23
Seven Lakes High School '19

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

### Re: Codebusters C

`TODAY, MAMAN(?) DIED. OR MAYBE YESTERDAY; I CAN'T BE SURE`
Encode the following word (one letter at a time) using RSA with e = 5 and n = 101.
TREES
You're right.

Isn't n supposed to be the product of two primes though?
Also, do you want me to use A=0, B=1, C=2, D=3, ..., Z=25 or convert the letters to ASCII code?
Yeah my bad I just chose a random n. n=102 should work? (51*2) and yeah just convert the letters directly (A=0, B=1, etc).
```49 17 24 24 18 (Interestingly, 17 and 18 encode to themselves?)

or I guess XRYYS```

TheWood
Member
Posts: 13
Joined: February 20th, 2019, 2:30 pm
Division: C
State: GA

### Re: Codebusters C

`TODAY, MAMAN(?) DIED. OR MAYBE YESTERDAY; I CAN'T BE SURE`
Encode the following word (one letter at a time) using RSA with e = 5 and n = 101.
TREES
You're right.

Isn't n supposed to be the product of two primes though?
Also, do you want me to use A=0, B=1, C=2, D=3, ..., Z=25 or convert the letters to ASCII code?
Yeah my bad I just chose a random n. n=102 should work? (51*2) and yeah just convert the letters directly (A=0, B=1, etc).
51 is not prime.

Riptide
Exalted Member
Posts: 192
Joined: December 4th, 2017, 7:09 pm
State: TX
Contact:

### Re: Codebusters C

You're right.

Isn't n supposed to be the product of two primes though?
Also, do you want me to use A=0, B=1, C=2, D=3, ..., Z=25 or convert the letters to ASCII code?
Yeah my bad I just chose a random n. n=102 should work? (51*2) and yeah just convert the letters directly (A=0, B=1, etc).
Riptide has left the server (UTF please ask a question so I can bury this mess) (also I got 4 for E not 24? but then again I clearly don't know RSA or math)
UC Berkeley '23
Seven Lakes High School '19

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

### Re: Codebusters C

Yeah my bad I just chose a random n. n=102 should work? (51*2) and yeah just convert the letters directly (A=0, B=1, etc).
Riptide has left the server (UTF please ask a question so I can bury this mess) (also I got 4 for E not 24? but then again I clearly don't know RSA or math)
*shrug*
Decode IYS ZIJFPE BTXAHCRZ IEKMIZAX, which was encoded using a Vigenere cipher with the keyword PROTEST

olivia.m19
Member
Posts: 32
Joined: November 11th, 2018, 9:11 am
Division: C
State: VA
Location: TJHSST

### Re: Codebusters C

Riptide has left the server (UTF please ask a question so I can bury this mess) (also I got 4 for E not 24? but then again I clearly don't know RSA or math)
*shrug*
Decode IYS ZIJFPE BTXAHCRZ IEKMIZAX, which was encoded using a Vigenere cipher with the keyword PROTEST
`THE GERMAN NATIONAL PASTTIME`
Duke/Reg/Cornell/State/Nat
Codebusters: 3/1/1/1/? Sounds of Music: 4/2/-/-/- Boomilever: 5/2/9/8/? Fermi Questions: 6/2/11/1/?

2017-18:
Reg/State/Nat
Fermi Questions: 4/-/- Helicopters: 4/-/- Towers: 1/-/-
Wifi Lab: -/4/13 Indoor Bottle Rocket: -/1/- Codebusters: -/-/1

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1518
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA

### Re: Codebusters C

Riptide has left the server (UTF please ask a question so I can bury this mess) (also I got 4 for E not 24? but then again I clearly don't know RSA or math)
*shrug*
Decode IYS ZIJFPE BTXAHCRZ IEKMIZAX, which was encoded using a Vigenere cipher with the keyword PROTEST
`THE GERMAN NATIONAL PASTTIME`

olivia.m19
Member
Posts: 32
Joined: November 11th, 2018, 9:11 am
Division: C
State: VA
Location: TJHSST

### Re: Codebusters C

Here's an excerpt from the lab I did in chem class today, encoded as a Caesar cipher:

Ze kyzj vogvizdvek, pfl nzcc jklup kyv vwwvtk fw zetivrjzex kyv tfetvekirkzfe fw re zfezt tfdgfleu fe tfeultkzmzkp.
`shift = 17`
Duke/Reg/Cornell/State/Nat
Codebusters: 3/1/1/1/? Sounds of Music: 4/2/-/-/- Boomilever: 5/2/9/8/? Fermi Questions: 6/2/11/1/?

2017-18:
Reg/State/Nat
Fermi Questions: 4/-/- Helicopters: 4/-/- Towers: 1/-/-
Wifi Lab: -/4/13 Indoor Bottle Rocket: -/1/- Codebusters: -/-/1