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1. Explain a situation where the Vigenere cipher scheme is perfectly secret. 2. Asma proposed an encryption scheme with an aligned proof of security with
1. Explain a situation where the Vigenere cipher scheme is perfectly secret.
2. Asma proposed an encryption scheme with an aligned proof of security with reference to certain definitions and assumptions. Later, Bashayer successfully attacked Asmas scheme. Explain what are probable causes for the successful attack?
3. Mention the requirements of one-time pad key. Then, show with an example the results of using the key twice.
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