DES Encryption/Decryption

[Chiguy]

I'm looking into making a DES encrypter/decrypter as a project for one of my classes.

I think I get how encryption works, but I'm not sure on decryption. The links below say this

"Decryption is simply the inverse of encryption, follwing the same steps as above, but reversing the order in which the subkeys are applied."

and

"Decryption uses the same algoriithm as encryption, except that the application of the subkeys is reversed."

The question is which one is it? (I'm not getting what inverse means in the first one. Does it mean reverse the encryption process or just do as the second one says?"

http://www.aci.net/kalliste/des.htm
http://www.soi.wide.ad.jp/class/2000.../index_44.html

Thanks

[TOAD6147]

"...follwing the same steps as above, but reversing the order in which the subkeys are applied."

That just might be the key to your problem. What are "...the same steps as above..."?

[Chiguy]

It's in the frist link I posted. I didn't post them since it's really long.