Cfb crypto

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Those are used for using block ciphers in a way similar to stream ciphers, among other things. The same plaintext block always produces the same ciphertext block for the same key making it vulnerable to a 'dictionary attack'. The CBC mode produces the same ciphertext whenever the same plaintext is encrypted using the same key and starting variable. The chaining operation makes the ciphertext blocks dependent on the current and all preceding plaintext blocks and therefore blocks can not be rearranged.

The use of different starting variables prevents the same plaintext enciphering to the same ciphertext. The CFB mode produces the same ciphertext whenever the same plaintext is encrypted using the same key and starting variable. The chaining operation makes the ciphertext variables dependent on the current and all preceding variables and therefore j-bit variables are chained together and can not be rearranged.

In my implementation this is always the case. Selection of a small value for j will require more cycles through the encipherment algorithm per unit of plaintext and thus cause greater processing overheads. The OFB mode produces the same ciphertext whenever the same plaintext enciphered using the same key and starting variable. More over, in the OFB mode the same key stream is produced when the same key and start variable are used. Consequently, for security reasons a specific start variable should be used only once for a given key.

The use of different start variables values prevents the same plaintext enciphering to the same ciphertext, by producing different key streams. OFB mode of operation does not extend ciphertext errors in the resultant plaintext output. Every bit error in the ciphertext causes only one bit to be in error in the deciphered plaintext. OFB mode is not self-synchronizing. If the two operation of encipherment and decipherment get out of synchronism, the system needs to be re-initialized.

Each re-initialization should use a value of the start variable different from the start variable values used before with the same key. I tested with newer 2. I also tested to compile the 1. But that version only supported the CBC modes of the ciphers and they worked with the --test-crypto test.

I dunno if I should have included them with some configure parameter. So is it enough to test that openvpn --test-crypto succeeds for all ciphers? Or are more elaborate tests required to ensure this problem is gone? On Ubuntu This was also reported in ticket What I don't understand is why some of the other ciphers do not work - esp CBC ciphers are not considered as 'best practice' anymore you can find some info on padding attacks when using CBC ciphers.

Patches are on the mailinglist, but awaiting approval. I'm leaving this ticket open until those are accepted too. New OpenVPN releases will contain these. Powered by Trac 1. Opened 11 years ago Closed 8 years ago.

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Cfb crypto	Analysis of certain aspects of output feedback mode. File:Cbc encryption. Note that a one-bit change in a plaintext affects all following ciphertext blocks. The message is divided into blocks and each block is encrypted separately. Lamport signature Transient-key cryptography Rabin signature algorithm Merkle signature scheme Signcryption Elliptic curve cryptography Georg An initialization vector has different security requirements than a cfb crypto, so the IV usually does not need to be secret.
Cfb crypto	The message is divided into blocks and each block is cfb crypto separately. The use of different starting variables prevents the same plaintext enciphering to the same ciphertext. If the two operation of encipherment and decipherment get out of synchronism, the system needs to be re-initialized. The reason for this is that an identical bit stream would be produced each time from the same parameters. Cfb crypto with key1, decrypt with key2 and then encrypt with key3. The chaining operation makes the ciphertext blocks dependent on the current and all preceding plaintext blocks and therefore blocks can not be rearranged.
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