So I saw this example of IDEA ..
If the key is : 5a14 fb3e 021c 79e0 6081 46a0 117b ff03
The encryption subkeys are: http://imgur.com/a/bZGMF
The decryption subkeys are: http://imgur.com/a/FnF2c
And I can't figure out how the decryption keys were computed.. How is additive inverse and multiplicative inverse done to calculate the decryption subkeys? plss helppp!!