7. The strength of the is that it completely hides single-letter frequencies. (I point) 8. One of the types of operations used for transforming plaintext to ciphertext is Transposition (I point) and the other is 9. is a technique where small punctures are used on selected letters which are (I point) ordinarily not visible unless the paper is held up in front of a light. 10. An encryption scheme is secure if the ciphertext generated by the scheme does not contain enough information to determine uniquely the corresponding plaintext, no (I point) matter how much ciphertext is available. Q2.Block Ciphers and the Data Encoption Standard 110points] 1. What is the effect of using few encryption rounds by the Feistel cipher on the offered security (2 points) level of the technique? 2. What is the implication of greater complexity in the subkey generation on the cryptanalysis complexity for the Feistel Cipher? (2 points) 3. A change in one bit of the plaintest or one bit of the key should produce a change in many bits of the ciphertext. This is referred to as the effect. (1 point) 4 In the Feistel block cipher theprovides the element of confusion of the (I point) cipher