Decrypt given data previously encoded with seed-cbc cipher algo. SEED in CBC (Cipher Block Chaining) mode, providing secure encryption by chaining blocks together. CBC mode was adopted for SEED to prevent identical plaintext blocks from producing identical ciphertext blocks. SEED-CBC is considered secure, though newer ciphers like AES are preferred in modern cryptographic applications. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.