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896 Words May 7th, 2014 4 Pages
INFA640 Research Paper Two.

SCENARIO ONE: 1. Alice, a high net worth customer, she banks online at Super Secure Bank (SSB) and has agreed to use 3DES in communicating with SSB. 2. One day, Alice received a statement that shows a debit of $1,000,000 from her account. On inquiring, she was told that the bank manager,Bob, transferred the money out of Alice's account and into an account of his own in an offshore bank. 3. When reached via email in the Cayman Islands, Bob produced a message from Alice, properly encrypted with the agreed upon 3DES keys, saying: "Thanks for your many years of fine service, Bob. Please transfer $1,000,000 from my account to yours as a token of my esteem and appreciation. Signed, Alice." 4. Alice filed suit
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SCENARIO TWO: 1. Alice changes banks following her troubles with SSB. At her new bank, Modern Security Trust (MST), she uses RSA as her cryptographic system. 2. She creates a key pair and supplies Frank, an officer of MST who will handle her account, with her public key {eA, nA}, securing her private key {dA, nA}on a floppy disk which she keeps locked in a wall safe at her home. 3. In turn, Frank gives Alice access to a key server maintained by MST so that she can readily obtain his current public key {eF, nF} whenever she needs to communicate securely with him. 4. Things are fine for several months, until Alice sends Frank a message m asking about current interest rates on Certificates of Deposit issued by MST. As shown below, she enciphers the message first, and then signs it: 5. A few days later, Alice received a statement that shows a debit of $1,000,000 from her account. On inquiring, she was told that Frank transferred the money out of Alice?s account and into an account of his own in a bank on the Caribbean island of Nevis. When reached via long distance in Nevis, Frank produced a message g from Alice saying: "Thanks for your excellent service, Frank. Please transfer $1,000,000 from my account to yours as a token of my esteem and

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