I am a beginner to homomorphic encryption scheme. As far as I think, it is just a kind of concealing real value without using standard encryption algorithms such as AES,DES or RSA. For example , for concealing value of $3$, it expresses $6$ where ($6=2 \times 3$). Decryption is done successfully if user knows $2$ (secret value). Is it correct or not?
Homomorphic encryption allows you to perform operations on the ciphertext that are reflected in the plaintext. These operations are not used to keep the plaintext confidential, that's performed by the homomorphic encryption itself.
Homomorphic encryption usually has little to do with obfuscation techniques, which is probably what you're looking for. "just looking for a light version" as you explain in your comments probably rules out homomorphic encryption techniques to accomplish obfuscation.