Vigenere Cipher, What key which if used to encrypt the ciphertext again would give back, Computer Network Security

Vigenere Cipher, Computer Network Security

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What key which if used to encrypt the ciphertext again would give back the plaintext (i.e. key is a weak key)? Define a formula for identifying weak keys for the cipher below (assume |K1| = |K2| = |K3|)

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Vigenere Cipher, Computer Network Security

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