Question 12 Alice is exchanging emails with Bob. Each implements asymmetric encryption using the RSA algorithm, symmetric encryption using 3DES, and integrity using SHA1 and MDS L KA* and KA denote Alice's asymmetric key pair, Kg* and Kg denote Bob's asymmetric key pair, Ks-A denote Alice's 3DES key. Ks-B denote Bob's 3DES key, HA denote Alice's SHA1 algorithm, and Hg denote Bob's MD5 algorithm. If Alice wants to send a confidential email (where m represents the plaintext message), which of the following schemes would produce such message? Note: The sign between (not the superscript) values represents concatenation. OKB* (m) OHA (m) + KB* (KS-A) Om+Ks-A(HA(m)) m+KB (Hg(m)) m+KA (HA(m))

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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.