2. Guidance on key lengths changes over time. (a) Name two reputable sources for key length recommendations (other than the ECRYPT recommendations of Table 10.1) and explain why they are credible sources. the recommendations shown in Table 10.1? which key length for this algorithm is 'equivalent to a symmetric key length (b) Towhat extent do their recommendations for symmetric key lengths 'match (c) Given a public-key cryptosystem, explain how experts might determine of 128 bits