ciphers

the spy used ciphers to communicate secretly.

understanding ciphers is essential for cryptography.

she decoded the ancient ciphers found in the ruins.

many ciphers can be broken with modern technology.

he learned to create his own ciphers for fun.

historical documents often contain complex ciphers.

teachers often use ciphers to engage students in puzzles.

she wrote her diary in ciphers to keep it private.

some ciphers are easy to crack, while others are not.

learning about historical ciphers can be fascinating.