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Triple DES (3DES) - Encrypt & Decrypt Online
Free online Triple DES symmetric encryption tool with ECB and CBC modes. Enhanced DES security for legacy financial systems and compatibility testing. All in your browser.
How to Use Triple DES Encrypt/Decrypt
Quick Start Guide
1
Enter your secret key - Triple DES requires a 24-byte key for three-key mode
2
Select ECB or CBC mode - CBC is recommended as ECB can reveal data patterns
3
Type or paste your text and click Encrypt to apply the 3DES algorithm
4
Copy the encrypted result - share it with the recipient who has the matching key to decrypt
Frequently Asked Questions
Triple DES applies the DES cipher three times with either two or three different keys, making it significantly stronger than single DES. It was the standard for financial transactions (like ATM PIN encryption) for decades before AES replaced it as the US federal standard.
Triple DES with three independent keys provides approximately 112 bits of security, which is adequate for many applications. However, AES is now preferred for new systems. 3DES remains in use in financial services and legacy systems, but NIST has deprecated it for new applications after 2023.
ECB (Electronic Codebook) encrypts each block independently, which can reveal patterns in the data. CBC (Cipher Block Chaining) XORs each block with the previous ciphertext before encryption, making identical plaintext blocks produce different ciphertext. CBC is recommended for most use cases.
Yes. This tool implements standard Triple DES encryption that is compatible with other 3DES implementations. Use the same key and mode (ECB or CBC) on both ends to ensure successful decryption.
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