1. What is the size of the key in the SDES algorithm? a) 24 bits b) 16 bits c) 20 bits d) 10 bits AnswerAnswer: d [Reason:] The size of the key in the SDES algorithm is 10 bits. 2. Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1? a) 10100100…