DES / 3DES Calculator
Encrypt and decrypt data using Single DES and Triple DES (2-key and 3-key) in ECB and CBC modes. Essential for ARQC derivation, PIN block encryption, and legacy key management in payment systems.
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Inputs
Code examples
from Crypto.Cipher import DES3
import binascii
key = binascii.unhexlify('YOUR_KEY_HEX')
data = binascii.unhexlify('YOUR_DATA_HEX')
cipher = DES3.new(key, DES3.MODE_ECB)
result = cipher.encrypt(data)
print(binascii.hexlify(result).decode().upper())About DES / 3DES
Single DES
Data Encryption Standard (FIPS 46-3). 64-bit block cipher with a 56-bit effective key (8 bytes stored, parity bits ignored). Cryptographically broken — exhaustive key search is feasible. Only used in legacy payment systems for backward compatibility.
Triple DES (3DES / TDEA)
Applies DES three times: Encrypt(K1) → Decrypt(K2) → Encrypt(K3) (EDE). 2-key variant uses K3=K1 for a 112-bit effective key. 3-key uses independent K1/K2/K3 for 168-bit key material. Widely used in EMV, HSMs, PIN translation, and DUKPT derivation.
ECB mode
Electronic Codebook — each 8-byte block is encrypted independently. Identical plaintext blocks produce identical ciphertext. Used in payment single-block operations: KCV computation, PIN block encryption, ARQC step functions.
CBC mode
Cipher Block Chaining — each plaintext block is XORed with the previous ciphertext block before encryption. Requires a random or zeroed IV. Used in ISO 9797 MAC algorithms and multi-block payment message authentication.