Documentation

This tool performs local IDEA (International Data Encryption Algorithm) encryption/decryption with multiple modes, paddings, and encoding formats.

IDEA uses a fixed 128-bit key and achieves thorough confusion through 8.5 rounds of encryption.

Key Features

  • IDEA with 128-bit key support
  • CBC, ECB, CFB, OFB, and RAW modes
  • Text processing and format conversion
  • Key/IV length validation hints

Steps

  1. Select encrypt or decrypt mode.
  2. Configure mode, padding, and key/IV formats.
  3. Enter input text and process.
  4. Copy the output result.

Notes

  • IDEA is a 64-bit block cipher and is mostly used for compatibility.
  • Keep all parameters aligned on both sides for interoperability.
  • For new systems, evaluate widely adopted standards such as AES.