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Posted by TC on July 31, 2006, 5:38 am
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Water Cooler v2 wrote:
> I only know what symmetric and public-key encryption systems are and
> how they work. I assume 3DES is a symmetric encryption technique.
> I came accross this term ECB mode with reference to 3DES encryption.
> Can someone explain what this means?
Let me, let me! :-)
Yes, 3DES is a symmetric cipher, because the same key(s) are used for
encrypt and decrypt. As opposed to an /asymmetric/ cipher, where
different keys are used for encrypt and decrypt.
As for ECB, this is applicable to any /block/ cipher (eg. 3DES). From
Wikipeda: "The simplest of the encryption modes is the electronic
codebook (ECB) mode, in which the message is split into blocks and each
is encrypted separately. The disadvantage of this method is that
identical plaintext blocks are encrypted to identical ciphertext
blocks; thus, it does not hide data patterns well. In some senses it
doesn't provide message confidentiality at all, and it is not
recommended for cryptographic protocols." Look down further for the
"striking example". It is indeed striking!
HTH,
TC (MVP MSAccess)
http://tc2.atspace.com
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