A good cipher, or mapping system, should meet what two criteria?
What will be an ideal response?
First, the cipher should make it difficult for an encrypted message to be viewed in its cleartext form, without the use of the cryptographic key. As you can imagine, the key is, and must be, a controlled secret. Secondly, the cipher should produce ciphertext that appears random in format to a casual user, or to anyone without the key. This means that within the encrypted ciphertext, no ascertainable patterns should be apparent. Also, the alphabetic symbols that appear in the ciphertext, should appear with equal frequency. These two criteria, if met, make it very difficult for someone to statistically attack the data to discover the cipher's mapping mechanism. Using a cryptographic method, the sender encrypts and the receiver decrypts.
You might also like to view...
If Amelia spends $300 per year at The Gap and spends an average of $1500 per year on clothes, then the share of customer for The Gap:
A) is 20 percent B) is 50 percent C) is $300 D) cannot be determined with the information provided
Country risk assessment is a measure of the
A. threat of nationalization. B. kidnapping rate. C. threat of losing an investment or not being paid. D. rate of unfunded exposures.
If you have a preferred communication style, you will most likely:
A) use that style exclusively B) change that style as you grow older C) display other communication styles at times D) be unable to understand people with other styles E) need to maintain that habitual style in all contexts
Which of the following statements is true of the operating budget?
A) It is a part of the financial budget. B) It includes the capital expenditures budget. C) It includes the sales budget. D) Its final component is the cash budget.