The paper introduces the first constructions of non-interactive forward-secure public-key encryption schemes. Forward security allows the system to mitigate the damage caused by the exposure of secret keys, ensuring that the security of past time periods is not compromised even if the secret key for a given time period is exposed. The main construction achieves semantic security against chosen-plaintext attacks in the standard model, with all parameters poly-logarithmic in the total number of time periods. The authors also introduce the concept of binary tree encryption (BTE) and construct a BTE scheme, which is the first hierarchical identity-based encryption scheme in the standard model. The paper includes extensions of the schemes to support an unbounded number of time periods and modifications to achieve security against adaptive chosen-ciphertext attacks. The BTE primitive is further used to construct a forward-secure encryption scheme, demonstrating the practicality and efficiency of the proposed schemes.The paper introduces the first constructions of non-interactive forward-secure public-key encryption schemes. Forward security allows the system to mitigate the damage caused by the exposure of secret keys, ensuring that the security of past time periods is not compromised even if the secret key for a given time period is exposed. The main construction achieves semantic security against chosen-plaintext attacks in the standard model, with all parameters poly-logarithmic in the total number of time periods. The authors also introduce the concept of binary tree encryption (BTE) and construct a BTE scheme, which is the first hierarchical identity-based encryption scheme in the standard model. The paper includes extensions of the schemes to support an unbounded number of time periods and modifications to achieve security against adaptive chosen-ciphertext attacks. The BTE primitive is further used to construct a forward-secure encryption scheme, demonstrating the practicality and efficiency of the proposed schemes.