THE ATBASH IS A SIMPLE SUBSTITUTION CIPHER WHERE THE FIRST LETTER IS CHANGED WITH THE LAST, THE
SECOND WITH THE PENULTIMATE,THE THIRD WITH THE THIRD TO LAST AND ETC…
IT WAS USED TO ENCODE THE HEBREW ALPHABET AND IT’S PRESENT IN SEVERAL VERSES OF THE BIBLE.
CLEAR ALPHABET:A/B/C/D/E/F/G/H/ I /J/K/L/M/N/O/P/Q/R/S/T/U/V/W/X/Y/Z
CODED ALPHABET:Z/Y/X/W/V/U/T/S/R/Q/P/O/N/M/L/K/J/ I/H/G/F/E/D/C/B/A
EXAMPLE:
CLEAR TEXT: ATTACK AT THE DAWN
CODED TEXT: ZGGZXP ZG GSV WZDM
VULNERABLE TO BRUTE FORCE ATTACK AND FREQUENCY ANALYSIS.