Suninatas Game 26

challenges

Game 26

This challenge requires breaking a random substitution cipher using frequency analysis. The ciphertext is:

szqkagczvcvyabpsyincgozdainvscbnivpnzvbpnyfkqhzmmpcqhzygzgfcxznvvzgdfnvbpnjyifxmpcqhzygbpnoyaimygbzgngbvmpcqhzygcbpinnbzqndicgxhiztozgcfmpcqhzygbpnjyifxeagzyimpcqhzygbpneagzyidicgxhiztozgcfmpcqhzygcgxcoyaibzqnvyabpsyincggcbzygcfmpcqhzygszqzvbpnozivbvyabpsyincgozdainvscbnibyjzgcqnxcfcbcgzvaeagzyiyivngzyidicgxhiztnungbzvampcqhzygvpzhcgxbpnyfkqhzmdcqnvvpnzvbpnozivbonqcfnvscbnibyjzgbpnyfkqhzmdcqnvbpnjyifxmpcqhzygvpzhvbpnoyaimygbzgngbvmpcqhzygvpzhvcgxbpndicgxhiztozgcfvpnzvygnyobpnqyvbpzdpfkinmydgzlnxcbpfnbnvcgxqnxzcozdainvzgvyabpsyinccvyochizfbpzvkncivpnzvicgsnxvnmygxzgbpnjyifxrkbpnzgbnigcbzygcfvscbzgdagzygvpnzvbpnmaiingbinmyixpyfxnioyifcxznvzgbpnvpyibhiydicqbpnoinnvscbzgdcgxbpnmyqrzgnxbybcfagxnibpnzvaeaxdzgdvkvbnqvpnzvcfvybpnozivbonqcfnvscbnibyvaihcvvbpnbjypaxincxhyzgbqcisagxnibpnzvaeaxdzgdvkvbnqvpnpcvgnunirnnghfcmnxyoobpnhyxzaqzgpningbzinmcinni

Frequency Analysis Approach:

Analyze the character frequency in the ciphertext:

$ echo "$CIPHER" | fold -w1 | sort | uniq -c | sort -nr
     92 n
     78 z
     69 g
     65 c
     65 b
     62 v
     60 i
     59 y
     58 p

In English text, the most common letters are E, T, A, O, I, N. Since n is the most frequent cipher character (92 occurrences), it likely maps to e in the plaintext. Similarly, z (78 occurrences) might map to t.

Use an online frequency analysis solver or substitution cipher tool to find the plaintext. Tools like quipqiup.com or frequency_analysis.html can automatically break the cipher based on English word frequencies.

The plaintext decrypts to a biography of Kim Yuna, a renowned South Korean figure skater, and the flag is her name.

kimyuna