The article proposes a new quantum-resistant cryptographic algorithm constructed based on the OTP (One-Time Pad) cipher and a hash function. By inheriting the property of “perfect secrecy” from the OTP cipher, the proposed algorithm can resist various types of attacks with the assistance of quantum computers. In addition to offering high security, this algorithm also has the ability to authenticate the origin and integrity of encrypted messages. Moreover, the one-time key for encryption/decryption is established for each individual message, while the management and distribution of the shared secret key between the sender/encryptor and receiver/decryptor are performed similarly to symmetric-key cryptosystems currently used in practice. Furthermore, this algorithm can also be applied as a pre-quantum cryptographic solution in practical applications.