Encrypt given data using camellia-256-cfb8 cipher algo. Camellia in 256-bit key size with CFB8 mode, encrypting 8 bits at a time, suitable for smaller data units. Part of the Camellia suite, developed by Mitsubishi Electric and NTT, CFB8 mode enhances flexibility in encryption, though it's less commonly used. Camellia-256-CFB8 is secure but less widely adopted compared to other modes like CBC or CTR. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.