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Understanding Key Serial Numbers (KSN) in Derived Unique Key Per Transaction (DUKPT)

I have a number of questions regarding Key Serial Numbers (KSNs) in DUKPT: KSNs are 8 - 10 bytes long. Older implementation are 8 bytes whereas newer ones are 10 bytes. Do I risk being incompatible ...
2
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2answers
217 views

Why is there a “des-ede3-cbc” in my rsa private key?

I have created an OpenSSL RSA private key and certificate request with 4096 bit with the following command: openssl req -newkey 4096 When I view the private key with openssl asn1parse -in privkey ...
0
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1answer
28 views

Getting multiple key matches on plaintext/ciphertext pairs in double DES

I'm trying to implement a Meet-in-the-Middle attack and just to test it out I've done some hardcoding of values, which is simply this block of simple code: byte[] key1 = new byte[] { 0x20, 0x00, ...
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0answers
20 views

2DES vs. two-key triple encryption, with no decryption step [migrated]

So studying double encryption (double DES) and understanding why it is subject to a Meet-in-the-middle attack, I tried to see if the same attack could be applied to a triple encryption with only two ...
2
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1answer
88 views

DES-CBC: Two ciphertext blocks c2 and c5 are equal. Why would this leak information?

Here, suppose that we were able to observe the ciphertext that we know had been encrypted in CBC mode, then how knowing of c2 and c5 ciphertext blocks would leak information ? My professor asked us ...
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1answer
393 views

Real time application of AES and DES [closed]

I am writing a paper on reducing the power consumption of security protocols. I am having trouble identifying sources that describe real-time usage of DES and AES, and how often they are used. I plan ...
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votes
2answers
378 views

Find DES encryption key having input and encrypted output

Having the source string: S3nh4#1 And the generated encrypted string: csf7259aT07Rw Using this script, it identified the algorithm used to encrypt as DES(Unix) I wonder if it is possible (in ...
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1answer
217 views

Mapping of plaintext and ciphertext in DES

The plain text and the cipher text have a one to one mapping. Given a pair of those, can there be multiple keys used to generate the same pair? Or can a particular plain text - cipher text mapping be ...
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2answers
126 views

Do DES keys have to be random?

In stream cipher (namely the OTP ) . The pad which the plain text is Xored with has to be random to achieve perfect secrecy , or psudorandom to ensure semantic security Dose this apply to DES or ...
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2answers
4k views

what is a difference between double DES and 3 DES

as i'm not getting the exact main point of 2 DES and 3DES. I would like to know the difference between the two, why 3 DES is chosen on 2 DES?
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1answer
192 views

How do I identify a DES encryption key in a dump file using winhex?

I've created a C# program that encrypts and decrypts a file. The encryption method is DES. The program is exactly the same as in the following link, except that the part that removes the key from ...
3
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1answer
488 views

Cracking DES(Unix)/MD5 ARP

This is a basic exemple of Unix Pass Encryption. I have little Hash of MD5 ARP : user50:$apr1$w7YNTrjQ$0/71H7ze5o9/jCnKLt0mj0 user60:$apr1$AIw2h09/$Ti0TRlU9mDpCGm5zg.ZDP. I need to find the pass ...
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2answers
6k views

How do I decrypt an Adobe Triple DES ECB-mode encrypted password?

So as you may have heard, the Adobe user database with 130 million records was leaked recently. I want to find out what password I used for the Adobe account I created to make sure that I'm not using ...
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1answer
1k views

How does DES provide confusion and diffusion? [closed]

I know that Data Encryption Standard (DES) provide strong security but I want to know how does it provides confusion and diffusion?
1
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2answers
429 views

Why two key DES algorithm provides only 80 bits security

In the wiki link, it is mentioned that due to "chosen-plaintext" or "known-cipher" attacks, two key DES provides only 80 bits of security. My question is how these attacks work and how did NSIT came ...
0
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2answers
133 views

How is the key obtained when I login via VPN?

So, I configure my VPN (let say which uses PPTP protocol), enter the server name, username and password. Then, I visit a website. Before that, my request is encrypted using AES with some key. That ...
0
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2answers
229 views

Why is SHA-3 (keccak) considered more secure than DES when you can attempt to crack it 3x faster? [closed]

Hash.Type....: descrypt, DES(Unix), Traditional DES Speed.GPU.#1.: 6215.8k/s Hash.Type....: SHA-3(Keccak) Speed.GPU.#1.: 20514.1k/s see: http://hashcat.net/forum/archive/index.php?thread-2085.html ...
5
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2answers
932 views

Is my SIM card vulnerable to DES cracking?

Srlabs have recently published article stating that many SIM cards can be exploited using vulnerability in DES: [...] While the option exists to use state-of-the-art AES or the somewhat outdated ...
19
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2answers
42k views

Security comparsion of 3DES and AES

Which one is more secure and least possible to be broken through cryptanalysis AES or 3DES (no matter performance)? I need to use encryption for my projects to store and secure sensitive information ...
5
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1answer
1k views

Is the DES “mangler” function invertible?

The DES symmetric cipher is based on a Feistel network operating repeated on 32-bit halves of the 64-bit block. The usage of Feistel means that the "mangler" function used does not need to be ...