(Answered) 1 what requirements must a public-key cryptosystems fulfill

Engineering

1. What requirements must a public-key cryptosystems fulfill to be a secure algorithm?

2. In the SHA-512 hash function,

a) What is value of the padding field if the length of the message is 1920 bits?

b) What is the value of the length field if the length of the message is 1921 bits?

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