DES / 3DES Encrypt/Decrypt — Free Online DES Encryption Tool
Encrypt and decrypt text with DES and Triple DES (3DES) in CBC or ECB mode — for legacy system compatibility.
Frequently Asked Questions
DES and 3DES: Understanding Legacy Encryption Standards
DES (Data Encryption Standard) was the dominant encryption algorithm from 1977 through the late 1990s. With a 56-bit key operating on 64-bit blocks, DES was revolutionary when introduced but is now considered cryptographically broken — brute force attacks can recover DES keys in hours using commodity hardware. In 1999, EFF's Deep Crack and distributed.net cracked a DES key in under 24 hours.
Triple DES (3DES) extends DES security by applying the algorithm three times: Encrypt with key K1, Decrypt with key K2, then Encrypt with key K3. With independent keys this provides 112 effective bits of security (due to meet-in-the-middle attacks). While stronger than DES, NIST deprecated 3DES in 2023 for all new use cases.
This tool exists for legacy compatibility — interfacing with banking systems (SWIFT), older payment terminals, and healthcare systems that predate AES adoption. For all new systems, use AES-256-GCM which is faster, more secure, and authenticated.