CTFlearn - [Crypto] Vigenere Cipher

Vigenere Cipher

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key : blorpy

Cipher : gwox{RgqssihYspOntqpxs}

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Solution

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c='gwox{RgqssihYspOntqpxs}'
key='blorpy'
idx=0

pt=''

for i in c:
	if i == '{' or i == '}':
		pt+=i
		continue
	
	capital = i.isupper()
	diff = ord(key[idx]) - ord('a')
	k=key[idx]
	idx=(idx+1)%len(key)

	decode = ord(i)-diff
	if decode < 97 and capital != 1: 
		decode+=26

	pt+=chr(decode)

print(pt)