Tell me the shortest and authentic Dhrood Sharif to read daily

الجواب حامدا و مصلیا

The most excellent Durood is Durood e Ibrahimi. It may be recited or any other Durood which is convenient may be adhered to. If the following Durood could be recited it would be better since many virtues are recorded in Ahadees e Mubaraka about it.
اَللّٰھُمَّ ربَّ مُحَمَّدٍ صَلِّ علٰی مُحَمَّدٍ وَّ علٰى آلِ مُحَمِّدٍ وَّاجزِ مُحَمَّدًا صَلَّى اللّهُ عَلَیهِ وَسَلَّمَ مَا ھُوَ اَھلُهُ
Quoting from Thabrani, the Hadees of Jabir Radhiyallahu Anhu is recorded in Nuzhathul Majaalis that Rasoolullahi Sallallahu Alaihi wa Sallam said, one who recites this Durood morning and evening would give labor to those who record the Sawab of this for one thousand days. It means that they will get tired by keeping on recording it’s Sawab for one thousand days. (Faza’il e Durood Shareef- authored by Hazrath Sheikh Rahimahullah -page 75)