Klingon

spbctf

Task: .NET WinForms crackme (klingon.exe) validating a 16-char hex password pair-by-pair via 8 hardcoded MD5 digests, then RC4-decrypting a win message. Solution: brute-force the 2-hex-char MD5 preimages to recover the password AF7A913EC8AE1337, then replicate the non-standard RC4 (persistent counter, i%256 index) to decrypt the embedded 99-byte array.