Free 3DES Encryptor / Decryptor - Online Triple DES Encryption | ToolZen
Encrypt or decrypt text using 3DES with ECB, CBC, CFB, OFB modes. All processing happens in your browser — your data never leaves your device.
Frequently Asked Questions
1. What is 3DES encryption?
3DES (Triple DES / TDEA) encrypts each data block three times with three different keys. It provides stronger security than single DES by applying the DES algorithm three times with different keys. 3DES uses a block size of 8 bytes.
2. Is 3DES still secure?
3DES has been deprecated by NIST and is no longer recommended for new systems. It is considered to have effective security of only 112-168 bits due to meet-in-the-middle attacks. For new systems, AES is strongly recommended.
3. What encryption modes are supported?
Four modes are supported: ECB (Electronic Codebook), CBC (Cipher Block Chaining), CFB (Cipher Feedback), and OFB (Output Feedback). ECB is deterministic and not recommended unless required for legacy compatibility. CBC is the recommended default.
4. What key sizes are supported?
3DES supports 128-bit (16 bytes, Keying Option 2) and 192-bit (24 bytes, Keying Option 1) keys. Enter the key as plain text: 16 characters for 128-bit, or 24 characters for 192-bit.
5. What is the difference between 3DES and AES?
AES is the modern successor to 3DES, offering better security, faster performance, and larger block sizes (16 bytes vs 8 bytes). 3DES is significantly slower and has a smaller block size, making it more vulnerable to certain attacks. NIST has officially deprecated 3DES as of 2023.
Key Features
- 128/192-bit Keys — Support for both 3DES keying options
- ECB/CBC/CFB/OFB Modes — Four encryption modes for legacy compatibility
- 5 Padding Schemes — PKCS7, Zero, ISO10126, ANSI X.923, NoPadding
- Hex & Base64 — Choose between hex and base64 output formats
- Encrypt & Decrypt — Both operations in one tool
How to Use
Step 1: Configure parameters
Select encryption mode, key size, padding scheme, and output format.
Step 2: Enter key and IV
Enter your 3DES key as plain text. For CBC/CFB/OFB modes, optionally enter an IV (auto-generated if empty).
Step 3: Encrypt or decrypt
Enter your text and click Encrypt or Decrypt to get the result.
Common Use Cases
Payment System Integration
Debug and verify 3DES-CBC encryption for EMV/POS payment interfaces and financial API calls.
Legacy System Migration
Decrypt 3DES-ECB encrypted database connection strings, configuration files, and credentials during system migration.
Security Research
Analyze 3DES ciphertext formats by testing different modes, key sizes, and padding combinations to identify algorithm parameters.
Why Choose ToolZen?
| Feature | ToolZen | Others |
|---|---|---|
| Privacy | Client-Side | Server Upload |
| Cost | Free | Freemium |
| Modes | ECB + CBC + CFB + OFB | 1-2 Modes |
| Padding | 5 Schemes | PKCS7 Only |
| Languages | EN + ZH | English Only |