Mitoku

The current head of the Konoha Cryptology Squad is a middle-aged professional who sees the day-to-day activities of the squad, taking direct orders from the Hokage in dire situations. He is usually seen working in front of the squad's office computer, and is presumably knowledgeable of all the secret codes Konohagakure uses in the delivery of messages (which is why he found it unusual that Jiraiya's encrypted message does not correspond to any code in their present holdings.

It appears he is somewhat lackadaisical and is not used to staying up late in the office, as implied by Shikamaru Nara when he was tasked by the Fifth Hokage to deliver Jiraiya's code and his desire to go home immediately after an overnight duty.