CIPHER PLAY - Cryptography Challenge

• Category : Cryptography | Beginner
• Challenge : CIPHER PLAY
• Author : davnit7607
• Attachment : Download
• Point : 26
• Quality : 2.15/5
• Difficulty : 1.15/5
• Flag format : cipher{your_flag}
• Message : Cipher text - xqclkr{m1b3v3e3_g1vh3i_1n_k001}
• key : Vinegar
• Description : While hacking Rohan loses the ciphertext to be submitted as a flag. But he remembered that it's a Vingenere cipher and the key is Vinegar. Help Rohan to retrieve the flag.

Who to solve it

In this attachment using encryption technique is Vigenere cipher.

what is Vigenere Cipher

Vigenere Cipher is a method of encrypting alphabetic text. That is simple form of polyalphabetic substitution. A polyalphabetic cipher is any cipher based on substitution. The encryption of the original text is done using the Vigenere square or Vigenere table.

Encryption
The plaintext(P) and key(K) are added modulo 26.
Encryption = (Plaintext + key) % 26

Decryption
Decryption = (Encryption - Key + 26) % 26

Vigenere Cipher Online Decoder

• boxentriq.com
• dcode.fr
• cs.du.edu