Confidential Nature of the Supreme Lord
The real information about Sri Krishna is a very confidential and esoteric subject matter and usually it is not openly revealed in Vedas. The Vedas give many indirect and subtle hints about Lord Krishna and His supreme position, but never in the Vedas will you find a direct declaration that Krishna is supreme and we should surrender to Krishna and become a devotee.
Appearance of the Lord in the World of Death
Lord Krishna personally appears in Mrityuloka (The universe of death) once in every four yugas i.e once in every 43,20,000 solar years. The purpose of His appearance is protection of Sanatana Dharma and destruction of Atheism.
Real purpose of God's appearance
yadā yadā hi dharmasya glānir bhavati bhārata abhyutthānam adharmasya tadātmānaṁ sṛjāmy aham (Gita, 4.7) - "Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion—at that time I descend Myself." But his real purpose is to appear before His devotees and give them pleasure of seeing His beautiful form.
Krishna's indirect description in the Vedas
"The one born before sunrise (उषसः पूर्वा) and later taken to the place of the cows (पदे गोः), is one without a second (त्वमेकम). He is adorned with bright, attractive and transcendental ornaments (परभूषन महद). The Gods and the Seers worship him with unlimited faith and devotion." - (Rig Veda - 3.55.1) This verse gives very strong hints about Lord Krishna who took birth before Sunrise in Mathura and then was taken to Gokul.
More information about Krishna in the Vedas
At other places in Rig Veda there is description of a beautiful cowherd boy (Gopa) who never falls from his position, and that Gopa (cowherd) boy is Vishnu himself. So Lord Vishnu has been mentioned clearly in the Vedas, but Lord Krishna’s information is a confidential secret which is kept hidden, because it is Krishna’s desire that Vedas should not directly reveal the secret about His real identity.
Krishna desires to conceal his identity from Atheists
An atheist always looks for ways to prove that Krishna doesn’t exist, or that He is merely a great person who is unnecessarily worshiped due to his achievements. Krishna as the Paramatma (supreme soul) residing in the heart of atheists knows their desire. To fulfill their desire He conceals His real identity in the Vedas, and only allows some hints and indirect information scattered here and there in the four Principal Vedas - Rig Veda, Sama Veda, Yajur Veda, and Atharva Veda.
Krishna is the original Author of the Vedas
Actually Krishna is the Author of the Vedas (Vedanta Krid) and the knower of the Vedas in completeness (Veda Vid), and He is to be known through the Vedas. The goal of Vedic study is the understand Krishna and our relationship with Krishna. vedaiś ca sarvair aham eva vedyo vedānta-kṛd veda-vid eva cāham (Bhagavad Gita 15.15)
Krishna is the Head of the Universal Government
Even in this mortal world the Prime Minister or Head of State keeps his movements and personal information secret. This information is only meant for very near and trustworthy persons or family members. A general or common person has no access to this information. If this is true for a mortal being, then just imagine the position of Sri Krishna who is the Head of the Universal Government of Gods who manage this vast universe.
We should try to understand Vedas with the help of Krishna's devotee
So we should not subscribe to the atheistic propaganda that Krishna is not mentioned in the Vedas. Vedas are giving us hints about Lord Krishna, and we should try to decode those hints with the help of a pure devotee of Lord Krishna. A devotee of Krishna can easily understand the real purpose of the Vedas and can guide us expertly.
Liberation from Maya or Illusion
Atheistic propaganda tries to put many obstacles before us, and tries to confuse us and bewilder us from the real path of salvation and devotion. Such propaganda tries to destroy all the links to Lord Krishna, and keep us trapped in illusion (Maya). If you take guidance from Krishna's devotees, all Vedic knowledge and information will be crystal clear and you will start loving Lord Krishna. Through such devotion you will be liberated from Maya or illusion.