Questions tagged [3des]

Question 1

There is challenge/response mechanism using 1 block (64 bits) of data for challenge and 3DES algorithm for computing response (by encrypting challenge data). It is using 168-bit 3DES key. I am trying ...

Question 2

A properly implemented 3DES consists of 3 independent keys. The brute-force meet-in-the-middle attack with known plaintext/ciphertext is the most effective brute-force method against 3DES, but it ...

Question 3

I learned that 3DES with 2keys used doesnt provide enough bit security but apparently 3DES with 3 different keys has 112bit security. Having valid plaintext/ciphertext pair, one is able to perform the ...

Question 4

I am an undergraduate student and i took the lesson of Cryptography. I am a bit confused on which answer is correct and what i should do in this scenario. The exercise is this: A block cipher has ...

Question 5

I know that 3DES was considered to increase the strength of DES from 56-bit to 112-bit (now considered 80-bit) by using 3 DES keys and doing DES-Encrypt(DES-Decrypt(DES-Encrypt(plain-text, key1), key2)...

Question 6

We know that NIST disallows TDES (PDF). So why is PCI still allowing DUKPT TDES? They do use one unique key per transaction. Is there any supporting logic or official statement for it?

Question 7

I checked a related question, but I still did not find the answer I was looking for. Specifically, do we have any statistics on the usage of DES/2DES/3DES? It seems from here that credit card systems ...

Question 8

For starters, I don't need any don't-roll-your-crypto stuff. We're discussing a hypothetical. So the idea is 3DES needs 3x the key size and achieves only 2x key size bit security. So using the 3x ...

Question 9

I know that DES has 56 independent key bits, and that 3DES has 168 independent key bits by using 3 separate 56-bit DES keys. 3DES also has a block size of 64 bits. If I use 3DES as the underlying ...

Question 10

I came across the following enterprise encryption scheme. I laughed when I first saw it, but I'm not a specialist and I'd like to know how bad it really is. 3DES-CBC k1=k2=k3 for 3DES IV for CBC is ...

Question 11

I saw a statement that the probability of finding a key $k'$ to simulate 3 keys $k_1$, $k_2$, $k_3$ is neglectable: $\mathrm{Enc}(k_3,\mathrm{Enc}(k_2,\mathrm{Enc}(k_1,x))) = \mathrm{Enc}(k′,x)$ When ...

Question 12

NIST SP 800-57 Part 1 rev 5 section 5.6.1.1 gives following comparison between different encryption types. For example, it shows that 3TDEA, RSA-2048, ECC224 provides security strength of 112 bits. ...

Question 13

Why are credit cards using 3DES instead of AES? As far I understood, even DES3 is less secure than AES. Why it is still used? I searched already in the internet and forum to check out if it is ...

Question 14

Please, can any extensively explain the importance of super encryption in relation to attacks experienced by single standard algorithms

Question 15

I came across DES-EDE3-CBC and a quick search didn't yield a clear explanation of what it is. Clearly, DES is the Data Encryption Standard and CBC is the Cipher Block Chaining mode. EDE is probably ...

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Questions tagged [3des]

How many plaintext/ciphertext pairs are needed for key recovery attack on 3DES?

3DES Security nowadays

3DES with 3 keys still secure?

Evaluate the security of the block cipher, parallel DES

What would the cryptographic strength of 3DES-squared be?

Why is DUKPT TDES allowed by PCI negating NIST

Is DES/2DES/3DES still used?

Would this 3AES-192 scheme achieve 384-bit key security with just a 384-bit key?

Input/Output size of compression functions

Exploit 3DES-CBC with known checksum of plaintext and repeated IV

Triple DES 1 key to simulate 3 keys

Security Strength of Symmetric vs Asymmetric Ciphers

Why are credits cards using 3DES instead of AES?

What is the importance of superencryption?

What is DES-EDE3-CBC?

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