C 104: Obfuscation CTF (49 pts)

Textbook


C 104.1 Hidden Word (3 pts)

Find the hidden word: AIGHRO
CGEHKI
HKDIST
RACTIO
NVBFWO
KEGGBG
The hidden word is the flag.

C 104.2 Reverse (3 pts)

Find the cleartext from this ciphertext:
RAER EHT OT GNICNAVDA
The cleartext is the flag.

C 104.3 Off the Rails (6 pts)

Find the cleartext from this ciphertext:
LDEIEACNN
The cleartext is the flag.

HINT


C 104.4 Columnar (10 pts)

Find the cleartext from this ciphertext:
DCNSG OOSTE RLARS IUROT CMENQ
The cleartext is the flag.

HINT


C 104.5 ROT13 (3 pts)

Find the cleartext from this ciphertext:
GBBFVZCYR
The cleartext is the flag.

HINT


C 104.6 Caesar (3 pts)

Find the cleartext from this ciphertext:
BHBJO XJUI UIF DBFTBS
The cleartext is the flag.

HINT 1

HINT 2


C 104.7 Decimal Encoding (3 pts)

Find the cleartext from this ciphertext:
66 65 83 69 32 49 48
The cleartext is the flag.

HINT


C 104.8 Hexadecimal Encoding (3 pts)

Find the cleartext from this ciphertext:
42 49 4E 41 52 59
The cleartext is the flag.

HINT


C 104.9 Binary Encoding (3 pts)

Find the cleartext from this ciphertext:
111000 100000 1000010 1001001 1010100 1010011
The cleartext is the flag.

HINT


C 104.10 Binary (6 pts)

Find the cleartext from this ciphertext:
bEpoliTebEprOfeSsIoNaLbutHavEAplaNtOkIlLeVeRyBOdyYoUmeEt
The cleartext is the flag.

HINT


C 104.11 XOR (3 pts)

The code below encrypts the message "HELLO" with a key of "u":

Challenge

Encrypt "TOPSECRET" with a key of "*".

The ciphertext is the flag.


C 104.12 XOR (3 pts)

The code below decrypts the message "=099:" with a key of "u":

Challenge

Decrypt this message:
3%?J,%?$.J#>
With a key of "j".

The cleartext is the flag.


Posted 10-25-18
Ported to new scoring engine 7-9-19