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des versus 3des

kamal-learn
Level 4
Level 4

hi

i would like to have an explanation about des and 3des, so my question

is does des use 56 bit form encryption or 64 bit ? i saw somewhere that the 8 bit in difference are used for parity is that true?.

my second question what is the lenght in bit of the block' s message on it des and 3des act to provide encryption?

thanks in advance

any suggestion ,advice ,would be great

2 Replies 2

Patrick Laidlaw
Level 4
Level 4

Hello,

You got it you are only using 56 bits for actual encryption. Triple des is just takeing the packet you encrypted and running the encryption algorithem twice more.

I really couldn't say much about your second question.

Patrick

m.sir
Level 7
Level 7

Yes des is using 56 bit key

3 des doesnt mean 3x encrypttion but

3des uses 3 different keys following:

by 1st key message is encrypted than this encrypted message is decrypted with second key and finally encrypted again with 3rd key - its much more secure than simply 3x encrypted message

HTH

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