Decrypt given data previously encoded with rc2-ecb cipher algo. RC2 in ECB (Electronic Codebook) mode, where each plaintext block is encrypted independently. RC2-ECB was widely used in early encryption systems but is vulnerable to pattern analysis in ciphertext. RC2-ECB is insecure due to the lack of chaining and is vulnerable to modern cryptographic attacks. 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.