: a-, L1Normal1No Spac Heading 1 Heading 2 Title Subtitle Paragraph Styles Key Key Key Key Figure 10.1. The key lifecyce PLS NO PLAGIARISM 1. 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. (b) To what extent do their recommendations for symmetric key lengths match' the recommendations shown in Table 10.1? (c) Given a public-key cryptosystem, explain how experts might determine which key length for this algorithm is 'equivalent' to a symmetric key length of 128 bits