C 104: Obfuscation CTF (49 pts extra)

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)

There is a seven-letter message hidden in this text:

bEpoliTebEprOfeSsIoNaLbutHavEAplaNtOkIlLeVeRyBOdyYoUmeEt

That seven-letter message 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
Description of C 104.10 updated 9-7-2020
Added targets to links 11-8-21
Background changed to white 9-24-23