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  • block cipher - How does DES decryption work? Is it the same as . . .
    $\begingroup$ That schematic does not directly apply to DES: it is missing the final swap, IP, FP; and shows decryption with L and R reversed; whereas in DES, thanks to the final swap, encryption and decryption are identical except for the order of subkeys $\endgroup$ –
  • DES Encryption: Looking for results for each round of encryption . . .
    Yes, that is correct; the decryption subkeys are exactly the encryption subkeys in the opposite order I don't have the per-round test vectors you were asking for, but I can make this suggestion: if you have DES working in the encrypt direction, you can generate the test vector yourself; recording the state of the block after each round
  • How can I prove that a Feistel round is its own inverse for DES?
    $\begingroup$ The way the answer is worded, the result of a round's XOR is placed in an R register on encryption, and in a L register on decryption If you look at a DES implementation in hardware, or at most software ones, that's simply not the case: the exact same code is used for encryption and decryption (except for computation of subkeys)
  • encryption - Why do we use encrypt-decrypt-encrypt (EDE) in 3DES . . .
    I'm wondering why we use encrypt-decrypt-encrypt (EDE) sequence in 3DES (also known as DES-EDE, TDES or TDEA) with three keys instead of three times encryption (EEE) with three different keys?
  • What is DES-EDE3-CBC? - Cryptography Stack Exchange
    Yes, “EDE” means encrypt-decrypt-encrypt for encryption (and decrypt-encrypt-decrypt for decryption) It's implicit in “triple DES” anyway: choosing which direction is encryption and which one is decryption is arbitrary, but the de facto standard choice for triple DES is that 3DES encryption does more 1DES encryption than decryption and
  • Question about DES S-boxes from Encryption to Decryption
    Would the S boxes be the exact same in the decryption phase as in the encryption phase just in reverse? Wouldn't there be a way to sense the pattern here? I know DES is not the most secure system anyway but this seems even more unsecured? I'm just a bit confused on how the math from encryption to decryption works
  • Frequency Analysis on DES, AES, 3DES using Cryptool2
    We know that DES and AES are permutations over block sizes of 8 or 16 bytes What you are showing is a DES or AES using mode of operation Analysis should only be performed on the combination of the two And you can actually find e g duplicate blocks when DES or AES is used in ECB mode
  • Decrypting 3-DES with DES - Cryptography Stack Exchange
    So assuming we encrypted using ciphertext = E(k3,D(k2,E(k1,plaintext))), then we can decrypt using 1-DES as follows: temp1 = D(k3,ciphertext) temp2 = E(k2,temp1) plaintext = D(k1,temp2) And of course if we are using something like Cipher Block Chaining, the whole sequence above would be considered one block cipher decryption Edit: 1
  • Equivalance of encryption and decryption in DES under bruteforce
    With k2=k3 and k4=k5 Where C = Cipher, M = plain text DEC = Decryption ENC = Encryption -kn = Is the number of key used, we have 5 keys so k1-k5 So my question is, from what I understand, the difference between DES encryption and decryption is only the key used (or more like the order in which the keys are being used) so they just cancel out one another if the keys in two subsequent enc dec





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