The ASCII table is composed of 128 characters, as for the Latin alphabet and the Caesar code, it is possible to shift the characters of a rank $ N $ to obtain another character.
Encryption considers the ASCII alphabet to be cyclic (moving after the end of the alphabet returns to the beginning) and uses a $ N $ value called offset, ranging from 1 to 127 (negative numbers are possible, this amounts to an offset in the other direction).
Frequency analysis should emphasize groups of characters more often (those corresponding to the letters of the plain message).
How to decipher ASCII Shift without knowing the shift?
dCode allows you to test the 127 offsets and displays the most probable results automatically.
What are the variants of the ASCII Shift cipher?
The shift ciphers are numerous, the most known is the Caesar cipher.