3DES Encryption Tool - Triple DES Cipher Online
Encrypt and decrypt with Triple DES (3DES/TDEA). Legacy encryption for banking, payment systems, and EMV cards. Free online 3DES tool.
Deprecated Algorithm: 3DES is deprecated by NIST (2023). Its 64-bit block size is vulnerable to attacks. Use AES for new applications.
Triple DES (3DES/TDEA)
Hex (48 chars) or text (padded to 24 bytes). Three 8-byte keys: K1, K2, K3.
Algorithm Details
Type: Block cipher
Block size: 64 bits (8 bytes)
Key size: 192 bits (168 effective)
Rounds: 48 (16 × 3)
Operation: E(K3, D(K2, E(K1, P)))
Keying Options
Option 1: K1≠K2≠K3 (168 bits)
Option 2: K1=K3≠K2 (112 bits)
Option 3: K1=K2=K3 (56 bits, avoid)
Still Used In
- EMV chip cards
- ATM PIN blocks
- Legacy banking APIs
- Payment terminals
- Older VPN systems