expression
hide a tree in the forest
Proverb meaning the best way to hide something is to place it among similar things, making it inconspicuous.
木を隠すなら森の中というように、秘密の情報も大量のデータに紛れさせれば見つかりにくくなる。
As the saying goes, 'if you want to hide a tree, put it in a forest'; secret information also becomes hard to find if you bury it in a large amount of data.
A Japanese proverb of uncertain origin; the idea is that the best hiding place is among similar things.