DES (Data Encryption Standard) Online Tool

Explore the Data Encryption Standard (DES) with interactive encryption, decryption, CBC/ECB mode selection, and 16-round subkey schedule visualization.

How to Use DES (Data Encryption Standard) Online Tool

  1. Enter 64-bit Block or Text: Input plaintext or ciphertext to process with the Data Encryption Standard.
  2. Provide 56-bit Key: Input an 8-byte key (56 effective key bits plus 8 parity bits).
  3. Execute 16 Feistel Rounds: View the 16 rounds of S-box substitution, subkey generation, and permutation results.

Frequently Asked Questions

Why is standard DES obsolete?

DES uses a 56-bit key size, which can be brute-forced in less than a day using modern hardware. It was superseded by Triple DES and ultimately AES.

What is the Feistel structure in DES?

The Feistel structure splits the 64-bit block into left and right 32-bit halves, iteratively applying a round function so that encryption and decryption logic are nearly identical.