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Encryption

wild_eyed · 2003-10-30 16:14:25

what does the following mean in simple english.: It is a 64-bit iterative block cipher with a 128-bit key and eight rounds. im trying to get a grasp on encryption.

30-10-2003 4:14pm

#1

wild_eyed

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what does the following mean in simple english.:
It is a 64-bit iterative block cipher with a 128-bit key and eight rounds.

im trying to get a grasp on encryption.

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Comments

#2 31-10-2003 3:37pm

charlieroot

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Its sound like your typical symmetric block cipher. It has a key length of 128 bits meaning, the key, ie the shared secret is 128 bits long. It block size is 64bits meaning it encrypts in blocks of 64 bits - breaks any message up into blocks of 64 or pads a message if its less than 64 bits. Iterative with 8 rounds means that what ever process is used to encrypt the data happens eight times, say you pass a message to a function say f, the message will be passed through it 8 times. So say your plaintext is p and your ciphertext is c, then c = f( f( f( f( f( f( f( f(p)))))))). I hope that make sense. Examples would be des,blowfish, idea etc....

Noel.

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