`C = ( a_k p + b_k ) mod 26`

Enter a value for all fields

The Affine Cipher equation encrypts a string using the Affine cipher method and returns a string of ciphertext. 

INSTRUCTIONS: Enter the following

• (p) Plaintext - the message you wish to encrypt
• (a_k) Key 1
• (b_k) Key 2

Ciphertext (C): The encryption returns a string of ciphertext

The Math / Science

First, convert your string of letters into numbers corresponding to their position in the alphabet (A = 0, B = 1, C = 2, etc...).

Then, plug each number (representing a letter) into the formula below (p = number, a_k = key1, b_k = key2).

C = [(a_k x p) + b_k] mod 26

This formula will result in a list of numbers; take these numbers and convert them back into letters based on their position (0 = A, 1 = B, 2 = C, etc...).

The resulting character string is your ciphertext. 

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String Manipulation Utilities

• String Compare: Examines two given strings to see if they are equal to each other.
• Palindrome Check: Evaluates if a given word or sentence is a palindrome. 
• Reverse String: Takes a given string of alphanumeric characters and reverses its order.
• Remove Vowels Consonants Numbers Whitespace: Removes all vowels, consonants, numbers, or whitespace from a string of text.
• String to Comma-Separated List: Takes any string and split it into a comma-separated list with options for spaces, bracket types, and capital letters. 
• Word Count: Counts the number of words in a given string regardless of punctuation and new lines. 
• Character Count: Counts the number of occurrences of each character in a string of text.
• Regex Remove: Takes a regex expression and compares it to a sample string to see which patterns should be removed from the string.
• Affine Cipher Encrypt: Encrypts ciphertext using an Affine Cipher algorithm given the ciphertext and two keys.
• Affine Cipher Decrypt: Decrypts ciphertext using an Affine Cipher algorithm given the ciphertext and two keys.
• Caesar Cipher Encrypt: Encrypts non-numeric data by shifting the letters forward or backward on the alphabet by a constant amount. 
• Caesar Cipher Decrypt: Dencrypts non-numeric data by shifting the letters forward or backward on the alphabet by a constant amount.
• String Alphabet Position Sum: Takes a string and converts each character to an integer corresponding to its position in the alphabet and then sums those positions.