Step -1. Accept 64-bit plain text

Step -2. Generate 56-bit key

Step -3. Shift the plain text block parallel to the Key bits

Step -4. Remove parity bits from the key

Step -5. Split key into 28 sections

Step -6. For each

a. Rotate the keys

b. Combine the sections

c. Compression permutation to reduce the key from 56 bits to 48 bits