Triple DES (3DES / TDEA) Encryption Tool

Online Triple DES (3DES/TDEA) calculator supporting 2-key and 3-key EDE modes with custom IVs and padding configurations for legacy cryptographic inspection.

How to Use Triple DES (3DES / TDEA) Encryption Tool

  1. Input Plaintext or Ciphertext Blocks: Enter data to process through the Triple Data Encryption Standard.
  2. Select 2-Key or 3-Key EDE Mode: Choose 2-Key 3DES (112-bit effective key) or 3-Key 3DES (168-bit effective key) using Encrypt-Decrypt-Encrypt sequence.
  3. Compute Triple Feistel Transformation: View the processed 64-bit blocks with legacy backward compatibility.

Frequently Asked Questions

How does Triple DES (3DES) work?

Triple DES applies DES three times: Encrypt with Key 1, Decrypt with Key 2, and Encrypt with Key 3. If Key 1 equals Key 2, it falls back to standard single DES.

Why was Triple DES phased out despite its 112/168 bit key?

Because of its small 64-bit block size. Under high-throughput TLS traffic, the birthday bound can be reached after only 32 GB of data (Sweet32 attack), allowing collision recovery.