The Atbash Cipher is a monoalphabetic substitution cipher that is relatively simple and does not require a key. Instead of a key, the substitution simply relies on reversing the alphabet. Therefore, 'A' becomes 'Z', 'B' becomes 'Y', and so forth. This makes it a weak cipher in terms of how easy it is to decode. However, it does have one notable security measure- including numbers and punctuation on either side of the alphabet that also has to be reversed.
Israel (Hebrew origin)
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Israel (Hebrew origin), “Atbash Cipher,” Ciphers and Encryption, accessed June 15, 2021, https://crypto.omeka.net/items/show/27.