Classic, Yet Complicated
| Name: | Classic, Yet Complicated |
|---|---|
| Hint: | Find the plaintext, the key is your flag! Flag format : HTB{key in lowercase} |
| Base Points: | Easy - Retired [0] |
| Rated Difficulty: |  |
 |
hendl  |
| Creator: | P3t4  |
Start with the file and hint again.
"alp gwcsepul gtavaf, nlv prgpbpsu mb h jcpbyvdlq, ipltga rv glniypfawe ekl 16xs nsjhlcb.
px td o lccjdstslpahzn fptspf xstlxzi te iosj ezv sc xcns ttsoic lzlvrmhaw ez sjqijsa xsp
rwhr. tq vxspf sciov, alp wsphvcv pr ess rwxpqlvp nwlvvc dyi dswbhvo ef htqtafvyw hqzfbpg,
ezutewwm zcep xzmyr o scio ry tscoos rd woi pyqnmgelvr vpm . qbctnl xsp akbflowllmspwt
nlwlpcg, lccjdstslpahzn fptspfo oip qvx dfgysgelipp ec bfvbxlrnj ojocjvpw, ld akfv ekhr zys
hskehy my eva dclluxpih yoe mh yiacsoseehk fj l gebxwh sieesn we ekl iynfudktru. xsp yam
zd woi qwoc."
Hint: Find the plaintext, the key is your flag!
This Challenge is going to be a short one. That series of strings looks like a form of substitution cipher. Looking at Vigenere Ciphers at:
http://www.dcode.fr/vigenere-cipher
The site quickly brute force decodes the string using HELLOWORLD to read:
"the vigenere cipher, was invented by a frenchman, blaise de vigenere in the 16th century.
it is a polyalphabetic cipher because it uses two or more cipher alphabets to encrypt the
data. in other words, the letters in the vigenere cipher are shifted by different amounts,
normally done using a word or phrase as the encryption key . unlike the monoalphabetic
ciphers, polyalphabetic ciphers are not susceptible to frequency analysis, as more than one
letter in the plaintext can be represented by a single letter in the encryption. the key is
the flag."
All of that just means that our flag is HTB{HELLOWORLD}