IDEA Encryption/Decryption

Online IDEA (International Data Encryption Algorithm) encryption/decryption tool with 128-bit fixed key, supporting CBC, ECB, CFB, OFB, RAW modes.

Key Features

128-bit fixed key length provides strong security
8.5 rounds of encryption ensure thorough confusion

Encryption Modes

Padding

Key (128 bits / 16 bytes)

Initialization Vector (IV) (64 bit / 8 bytes)

Input Format / Output Format

Input Format

Output Format

Input Content

Documentation

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

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

Select encrypt or decrypt mode.
Configure mode, padding, and key/IV formats.
Enter input text and process.
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.