Question: Triple DES is a widely used block cipher whose design is motivated by practical considerations. (a) Explain what is meant by backwards compatibility.( I've tried

Triple DES is a widely used block cipher whose design is motivated by practical considerations.

(a) Explain what is meant by ‘backwards compatibility’.(I've tried looking for answer for this, but no one is talking about the ‘backwards compatibility’ In the answer could you highlight the part that deals with this. Thank you)

(b) Describe three different ways in which keys could be chosen in order to make Triple DES backwards compatible with (single) DES.

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