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Key generation in IDEA.
written 7.6 years ago by gravatar for sagarnarkar sagarnarkar • 2.0k modified 4.1 years ago by gravatar for prashantsaini prashantsaini • 0
cryptography and system security
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written 7.6 years ago by gravatar for sagarnarkar sagarnarkar • 2.0k

IDEA:

  1. It is Block Cipher Algorithm.
  2. IDEA is the replacement of DES (Data Encryption Standard).

Sequence of operation in one round:

  1. Multiply P1 and K1.

  2. Add P2 and second K2.

  3. Add P3 and third K3.

  4. Multiply P4 and K4.

  5. Step 1 ⊕ step 3.

  6. Step 2 ⊕ step 4.

  7. Multiply step 5 with K5.

  8. Add result of step 6 and step 7.

  9. Multiply result of step 8 with K6.

  10. Add result of step 7 and step 9.

  11. XOR result of steps 1 and step 9.

  12. XOR result of steps 3 and step 9.

  13. XOR result of steps 2 and step 10.

  14. XOR result of steps 4 and step 10.

Same operations are performed in 8 rounds.

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