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Yes AFAICT, but why not use one of teh GPG or OPENSSL encrypt/decrypt with the right parameters....<br />
3DES is deprecated for real world use btw, &nbsp;because of to small a keysize and there have been found some weeknesses.
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Yes AFAICT, but why not use one of teh GPG or OPENSSL encrypt/decrypt with the right parameters....
3DES is deprecated for real world use btw,  because of to small a keysize and there have been found some weeknesses.

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Correct. Why the interest in 3DES?
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CyperOps, and other certifications require me to know it... and it's interesting<br />
<br />
-dave.j
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CyperOps, and other certifications require me to know it... and it's interesting

-dave.j

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i'm missing something in my cryptography understanding.<br />
<br />
i've looked through several sources and want to verify im getting this right.<br />
<br />
the 3DES process:<br />
<br />
3 56 bit keys act on a 64 bit block of data.<br />
Key1 encrypts the data, Key 2 decrypts the data, and then Key3 encrypts the data <br />
some implementations use the same key for Key1 and Key3, so effectively in those implementations the total key length is 112, if 3 different keys are used, it's 168 bits.<br />
<br />
so, we send the data across the wire and we want to decrypt it.<br />
<br />
we take Key3 to decrypt the ciphertext, which still yields ciphertext, because we have to encrypt this ciphertext with Key2, and then go through the 3rd step which is to decrypt that ciphertext, and finally get plaintext.<br />
<br />
is this correct?<br />
<br />
any further input is very welcome<br />
<br />
thanks,<br />
<br />
-Dave.J
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i'm missing something in my cryptography understanding.

i've looked through several sources and want to verify im getting this right.

the 3DES process:

3 56 bit keys act on a 64 bit block of data.
Key1 encrypts the data, Key 2 decrypts the data, and then Key3 encrypts the data 
some implementations use the same key for Key1 and Key3, so effectively in those implementations the total key length is 112, if 3 different keys are used, it's 168 bits.

so, we send the data across the wire and we want to decrypt it.

we take Key3 to decrypt the ciphertext, which still yields ciphertext, because we have to encrypt this ciphertext with Key2, and then go through the 3rd step which is to decrypt that ciphertext, and finally get plaintext.

is this correct?

any further input is very welcome

thanks,

-Dave.J

3DES process

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.