In cryptography it's a number, or letter, thrown in for the sake of appearance, or to confuse.
In this work the different methods of cryptography are classified.
Cryptography, krip-tog′ra-fi, n. the art of secret writing: the character or cipher so used.
He is the author of a work on cryptography, I believe, though I am ashamed to say I haven't yet read it.
I am not altogether ignorant of cryptography; it was Trevisa's favorite pursuit when we were at college.
The same with cryptography, which we've both run up against, no doubt, in course of business.
If they retained the name of some god or hero of mythology, the only way they dared to write it was by cryptography.
They are much more difficult to decipher than was the cryptography left by the pirate Kidd.