can be calculated by 066+ For example, for English ciphertext with L-26, typical LC. can be obtained using the following equation: N(N-I) C33873 Lab Envcise where N is the total number of leters in the cipertext, no is the number of occurrences of letter A, n is the number of occurrences of letter B, na is the number of occurrences of letter C, and so on b) On the other hand, for a language of an alphabet of L leters,given a cipher of period d, the expected value of LC. We can use index of coincidence (I.C) to reduce key period possibilities a) Caloulated from the provided ciphertext, an estimate of L.C. To decipher the Vigenere ciphertext, first determine the possible key period d. White a computer program with a programming language (e.g, Java) to decipher the ciphertext. The attached fle VigenereCipher.bxt is a sample of ciphertext generated using a Vigenere cipher of unknown key period. Did you get the correct ciphertext? The following is the main work of this lab. with the keyword vigenere In the following table, the first row is the plaintext, the second row is the repeating keywords, and the third row is the ciphertext according to Vigenere cipher. Transcribed image text: LAB ACTIVITIES: To get a deep understanding of Vigenere cipher, try to encrypt a plaintext message "in God we trust.
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