Simple Cipher

Challenge Overview

Implement the Vigenère cipher, a simple substitution cipher.

Visit the simple-cipher exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @rabestro (⭐ 0) — View on Exercism
Solution 2 by @anseok (⭐ 0) — View on Exercism
Solution 3 by @ZennilGreenherald (⭐ 0) — View on Exercism

Source: Exercism awk/simple-cipher

💡 View Solution

@load "ordchr"

BEGIN {
    OFS = FS = ""
    AlphabetSize = ord("z") - ord("a") + 1
    if (!key) randomKey()
    if (key !~ /^[a-z]+$/) {
        print "error: invalid key" > "/dev/stderr"
        exit 1
    }