Very Basic

DESCRIPTION

Sometimes, we need to oscillate To and fro? things become tough when interwoven together.

key.txt

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

FLAG FORMAT: DSC{[A-Za-z0-9_]+}

Solution

• A pretty guessy challenge

• Using CyberChef to Vignere decode with KEY as the key

• Recipe for cyberchef

Vigenère_Decode('KEY')
From_Base32('A-Z2-7=',false)
From_Base32('A-Z2-7=',false)
From_Base64('A-Za-z0-9+/=',true,false)
From_Base32('A-Z2-7=',false)
From_Base64('A-Za-z0-9+/=',true,false)
From_Base32('A-Z2-7=',false)
From_Base64('A-Za-z0-9+/=',true,false)
From_Base32('A-Z2-7=',false)
From_Base32('A-Z2-7=',false)
From_Base64('A-Za-z0-9+/=',true,false)

• Flag: DSC{V17_P0L1CY}