Theoretical Vs Practical Ciphers

What are true statements about ciphers with perfect secrecy?

It can never have key length shorter than the message length (bitwise encryption)

If each key is equally probable then it has perfect secrecy

It only applies for bitwise encryptions

What are the true statements about cryptanalytic attacks?

Attacker needs to know one or more pairs for known plaintext attack

One time pad is vulnerable to known plaintext attacks

In known plaintext attack, attacker has access to cipher to encrypt any plaintext

{"name":"Theoretical Vs Practical Ciphers", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"What are true statements about ciphers with perfect secrecy?, What are the true statements about cryptanalytic attacks?","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}