Concept explainers
Can the accident transposition of two consecutive digitals in an airline ticket identification number be detected using the check digit?
Periodicals are identified using as International Standard Serial Number (ISSN). An ISSN consists of two blocks off four digits. The last digit in the second block is a check digit. This check is determined by the congruence
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Discrete Mathematics and Its Applications ( 8th International Edition ) ISBN:9781260091991
- Suppose that in a long ciphertext message the letter occurred most frequently, followed in frequency by. Using the fact that in the -letter alphabet, described in Example, "blank" occurs most frequently, followed in frequency by, read the portion of the message enciphered using an affine mapping on. Write out the affine mapping and its inverse. Example 2 Translation Cipher Associate the letters of the "alphabet" with the integers. Let and define the mapping by where is the key, the number of positions from the plaintext to the ciphertext. If our alphabet consists of through, in natural order, followed by a blank, then we have "letters" that we associate with the integers as follows:arrow_forwardSuppose that in an RSA Public Key Cryptosystem, the public key is. Encrypt the message "pay me later” using two-digit blocks and the -letter alphabet from Example 2. What is the secret key? Example 2 Translation Cipher Associate the letters of the "alphabet" with the integers. Let and define the mapping by where is the key, the number of positions from the plaintext to the ciphertext. If our alphabet consists of through, in natural order, followed by a blank, then we have "letters" that we associate with the integers as follows:arrow_forwardShow that the check digit in bank identification numbers satisfies the congruence equation .arrow_forward
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