Why "Shibboleth"
Taken from Judges 12
Jephthah and Ephraim
1 The men of Ephraim called out their forces, crossed over to Zaphon and said to Jephthah, "Why did you go to fight the Ammonites without calling us to go with you? We're going to burn down your house over your head."
2 Jephthah answered, "I and my people were engaged in a great struggle with the Ammonites, and although I called, you didn't save me out of their hands. 3 When I saw that you wouldn't help, I took my life in my hands and crossed over to fight the Ammonites, and the LORD gave me the victory over them. Now why have you come up today to fight me?"
4 Jephthah then called together the men of Gilead and fought against Ephraim. The Gileadites struck them down because the Ephraimites had said, "You Gileadites are renegades from Ephraim and Manasseh." 5 The Gileadites captured the fords of the Jordan leading to Ephraim, and whenever a survivor of Ephraim said, "Let me cross over," the men of Gilead asked him, "Are you an Ephraimite?" If he replied, "No," 6 they said, "All right, say 'Shibboleth.' " He said, "Sibboleth," because he could not pronounce the word correctly, they seized him and killed him at the fords of the Jordan. Forty-two thousand Ephraimites were killed at that time.
In order to be sure whether to allow someone to pass, we must check there credentials are correct, but there is no need to kill someone for forgetting their password...
What is "Shibboleth"
either
a method of retrieving credentials from an authentication authority
or
an ear of wheat