Applied Crypto

Question 1

What makes OTP provably secure?

Answer 1

1) Ciphertext gives no useful information about plaintext

2) All plaintext are equally likely

Question 2

What are the challenges of using OTP?

Question 3

What are Stream Ciphers?

Answer 3

Using a key,

Generate a pseudorandom bits and encrypt the plaintext by XORing with the generated pseudorandom bits