How do you decode a substitution cipher with a key?
In a substitution cipher, each letter in the plaintext is replaced by a different letter, number, or symbol in the ciphertext. The key to decoding the cipher is a list of the substitutions that were made.
To decode a substitution cipher with a key, follow these steps:
- Write out the ciphertext.
- Write out the key.
- For each letter in the ciphertext, look up the corresponding substitution in the key.
- Write down the substituted letter.
- Continue until you have decoded the entire ciphertext.
For example, if you have the ciphertext "WKH TXLFN EURZQ IRA MXPSV RYHU WKH OLIH" and the key "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", you would decode it as follows:
- Write out the ciphertext: WKH TXLFN EURZQ IRA MXPSV RYHU WKH OLIH
- Write out the key: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
- For the first letter in the ciphertext, "W", look up the corresponding substitution in the key: "A". Write down the substituted letter: "A".
- Continue until you have decoded the entire ciphertext: "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"
5 Related Questions and Answers
- What is a substitution cipher? A substitution cipher is a type of encryption that replaces each letter in the plaintext with a different letter, number, or symbol in the ciphertext.
- How do you decode a substitution cipher without a key? It is possible to decode a substitution cipher without a key, but it can be difficult and time-consuming.
- What are some common substitution ciphers? Some common substitution ciphers include the Caesar cipher, the Vigenère cipher, and the Enigma cipher.
- How can I create my own substitution cipher? You can create your own substitution cipher by choosing a key and then replacing each letter in the alphabet with the corresponding substitution from the key.
- What are some uses for substitution ciphers? Substitution ciphers can be used for a variety of purposes, including encryption of sensitive information, creation of puzzles, and development of cryptographic algorithms.
5 Related Hot Sale Products
- Rosetta Stone Total Arabic
- Codecademy Learn Cryptography
- Simon Singh The Code Book
- National Geographic Ultimate Secrets of the Bible
- The Art of Deception: Controlling the Human Element of Security
Pre：Do you waste more gas if you turn the air conditioning to full
Next：Is it normal for a car to have a coolant leak only when running
^