DES (Data Encryption Standard)
DES is a symmetric-key encryption algorithm that was widely used in the past to secure data
DES takes plaintext (your original data) and transforms it into ciphertext (encrypted data) using a secret key. The same key is used to decrypt it back.
How DES works (simplified)
- Operates on 64-bit blocks of data
- Uses a 56-bit key (plus 8 parity bits)
- Applies a series of 16 rounds of transformations (called a Feistel network)
- Each round mixes the data with the key using substitutions and permutations
Why DES is considered insecure today
DES is no longer safe because:
- Key is too short (56 bits) → can be brute-forced with modern hardware
- Vulnerable to attacks due to outdated design
- Cracked publicly as early as 1998
What replaced DES
DES has been replaced by stronger algorithms like:
- AES (Advanced Encryption Standard) → modern standard, widely used
- 3DES (Triple DES) → a temporary improvement (now also being phased out)