soal

It seems that another encrypted message has been intercepted.
The encryptor seems to have learned their lesson though and now there isn’t any punctuation! Can you still crack the cipher?
Download the message here.

hint

• Try refining your frequency attack, maybe analyzing groups of letters would improve your results?

solve

wget https://artifacts.picoctf.net/c/112/message.txt

cat message.txt
nafyffoxenefufytpqnafymfppfentkpxeafbaxraezaqqpzqgswnfyefzwyxnhzqgsfnxnxqlexlzpwbxlrzhkfystnyxqntlbwezhkfyzatppflrfnafefzqgsfnxnxqlevqzwesyxgtyxphqlehenfgetbgxlxenytnxqlvwlbtgflntpemaxzatyfufyhwefvwptlbgtycfntkpfecxppeaqmfufymfkfpxfufnafsyqsfyswysqefqvtaxraezaqqpzqgswnfyefzwyxnhzqgsfnxnxqlxelqnqlphnqnftzautpwtkpfecxppekwntpeqnqrfnenwbflnexlnfyfenfbxltlbfozxnfbtkqwnzqgswnfyezxflzfbfvflexufzqgsfnxnxqletyfqvnflptkqyxqwetvvtxyetlbzqgfbqmlnqywllxlrzafzcpxenetlbfofzwnxlrzqlvxrezyxsneqvvflefqlnafqnafyatlbxeaftuxphvqzwefbqlfospqytnxqltlbxgsyquxetnxqltlbqvnflatefpfgflneqvspthmfkfpxfuftzqgsfnxnxqlnqwzaxlrqlnafqvvflexuffpfgflneqvzqgswnfyefzwyxnhxenafyfvqyftkfnnfyufaxzpfvqynfzafutlrfpxegnqenwbflnexltgfyxztlaxraezaqqpevwynafymfkfpxfufnatntlwlbfyentlbxlrqvqvvflexufnfzalxiwfexefeeflnxtpvqygqwlnxlrtlfvvfznxufbfvfleftlbnatnnafnqqpetlbzqlvxrwytnxqlvqzweflzqwlnfyfbxlbfvflexufzqgsfnxnxqlebqfelqnpftbenwbflnenqclqmnafxyflfghtefvvfznxufphtenftzaxlrnafgnqtznxufphnaxlcpxcftltnntzcfysxzqznvxetlqvvflexufphqyxflnfbaxraezaqqpzqgswnfyefzwyxnhzqgsfnxnxqlnatneffcenqrflfytnfxlnfyfenxlzqgswnfyezxflzftgqlraxraezaqqpfyenftzaxlrnafgflqwratkqwnzqgswnfyefzwyxnhnqsxiwfnafxyzwyxqexnhgqnxutnxlrnafgnqfospqyfqlnafxyqmltlbfltkpxlrnafgnqkfnnfybfvflbnafxygtzaxlfenafvptrxesxzqZNV{L6Y4G_4L41H515_15_73B10W5_8F1KV808}

tool

• https://www.quipqiup.com/
  • 
  • pola yang sudah saya dapat ini: sxzqZNV=picoCTF
• kareana dibawah sudah dapat pola yang benar hanya saja karena ada nomer tidak kena jadi saya mencoba memindahkan teks hasil frequency ini ke dalam flag

  pico c t f n r m ny due bf
  sxzqZNV{L6Y4G_4L41H515_15_73B10W5_8F1KV808}
  
  picoCTF{N6R4M_4L41H515_15_73B10W5_8F1KV808}
  picoCTF{N6R4M_4N41Y515_15_73B10W5_8F1KV808}
  picoCTF{N6R4M_4N41Y515_15_73D10U5_8E1BF808}
  

manual

git clone https://github.com/m-rosinsky/Krypton_Scripts
cp Krypton_Scripts/freq_analysis.py .

# ...

flag

picoCTF{N6R4M_4N41Y515_15_73D10U5_8E1BF808}