Caesar cipher
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In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
Mezuzah
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A mezuzah is a piece of parchment inscribed with specific Hebrew verses from the Torah, which Jewish followers of Rabbinical Judaism fix to the doorposts of their homes. These verses are the Biblical passages in which the use of a mezuzah is commanded ; they also form part of the Shema prayer.
Mezuzah at the entrance to POLIN Museum of the History of Polish Jews; the mezuzah parchment is inside a red decorative case
Ashkenazi mezuzah, as accepted in Rabbinical Judaism; the case is tilted and features the Hebrew letter ש (Shin)
A Sephardic mezuzah, as accepted in Rabbinical Judaism; the mezuzah case is vertical and features the Hebrew letter ש (Shin)
Then-president of Israel Reuven Rivlin putting up a mezuzah at Beit HaNassi, 2017