3DES (Triple DES) Encryption / Decryption

Triple DES applies the DES cipher three times to each data block. While superseded by AES for new applications, 3DES remains widely used in payment card systems, ATM networks, and legacy banking infrastructure.

Inputs

• Block Cipher Mode: Block cipher mode of operation.
• Padding: Padding scheme for data that is not a multiple of 8 bytes.
• Key: DES key in hexadecimal: 16 bytes (double-length) or 24 bytes (triple-length).
• IV: Initialization Vector (8 bytes / 16 hex chars) for CBC mode.
• Data: Plaintext or ciphertext in HEX or ASCII format.

Tips

• Double-length keys (16 bytes) are standard in payment systems.
• 3DES provides an effective security of 112 bits with two-key variant.
• NIST has deprecated 3DES after 2023 — migrate to AES when possible.

Standards: NIST SP 800-67 Rev.2, ANSI X9.52, ISO/IEC 18033-3

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