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-4
votes
0answers
47 views

What is this Hash Algorithm? [on hold]

I Have 75 character, a Hashed, 300-bit value (75 hexadecimal characters) ,which hash algorithm is with this specification?? 8D89ACHIEF5HIJKNMNOPQRSTUVWXYZ0143456789ABCDEFGHIJKLJKLM56789ABC31234567890 ...
2
votes
0answers
16 views

CMS/PKCS#7: specifying signatureAlgorithm with digest?

I'm confused about algorithm selection for Cryptographic Message Syntax (a.k.a. CMS, PKCS#7) signed objects (RFC5652 Section 5.1). The SignerInfo structure (RFC5652 Section 5.3) has two separate ...
4
votes
2answers
60 views

Securing anonymous website posts

Can a website allow users to securely post anonymously, while still allowing these posts to be edited by the original author at a later time and preventing editing by other users? In this context, ...
0
votes
1answer
68 views

How to pick an encryption algorithm (cipher) and mode for PHP's mcrypt, for encrypting passwords?

There are numerous algorithms listed in the PHP documentation: http://php.net/manual/en/mcrypt.ciphers.php How strong is each one and what criteria to use when picking one? Also the ...
1
vote
0answers
70 views

Store 2-legged one-time password's key securely

I have a system with a OTP authentication and I need a method to encrypt the main "secret algorithm". In my system each OTP has a pair named "solution" and it is also changing like the OTP. I need to ...
0
votes
0answers
16 views

why DH is unbreakable and what are the facts that leads to strong DH? [duplicate]

I am new to DH and learned the basic about DH working and suspecting it can be breakable by normal MIM , then how we can use DH in plain http for sharing secret. correct me if i am wrong.
1
vote
1answer
82 views

Why is a cookie's life extended after half the time has passed on a sliding expiration algorithm?

I'm coding my sliding expiration algorithm for Bearer tokens to mimic what's done by Microsoft on their FormsAuthentication logic, and reading their documentation they say (emphasis added) When ...
0
votes
0answers
67 views

Implementation of IDEA algorithm in MATLAB

I need to implement IDEA (international-data-encryption-algorithm) in MATLAB. I have thoroughly searched in different pages and forums but couldn't find the implementation details. I also tried to ...
5
votes
2answers
114 views

which memory hard hashing algorithm can equalize low-computational and high-computational power devices to utilize blockchain in the IoT?

Recently IBM and Microsoft showed their interest (IBM post, Microsoft post) in utilizing bitcoin's blockchain for internet of things (IoT) development. Let's assume that in close future the blockchain ...
0
votes
1answer
66 views

Algorithms for transaction authentication

It's unclear to me how transaction signing and transaction authentication work. Industrial solutions use both symmetric and asymmetric algorithms to compute the signature. What does RSA add the ...
1
vote
4answers
349 views

Is 3DES outdated for message authentication code computing?

I am working in IT department of a bank, currently we use 3DES to compute MAC of packet, is that safe enough using 3DES? Should we use any other more modern algorithm?
0
votes
1answer
46 views

Can the aproximated date on which a given Encryption Algorithm will become prone to brute force be predicted?

I have a very elementary understanding about encryption so this question may have false assumptions, Lets take an encryption algorithm that is impractical to break through bruteforce with today's ...
-2
votes
3answers
257 views

My friend hashes passwords with SHA512 algorithm without salt. How do I convince him that he needs to add salt?

Today I discovered something incredibly stupid - my friend hashes user passwords with sha512 algorithm without a salt. I immediately raised this issue to him but he said he wants to see anyone crack a ...
2
votes
1answer
659 views

Is knowing the decrypted and encrypted data enough to find the key?

Let's say an attacker knows the encrypted content, the decrypted content and the algorithm used: can he get the key that was used to encrypt the content or does it make it easier to find the key out? ...
-3
votes
1answer
102 views

What is the algorithm of bcrypt? [closed]

In many places I heard that people recommend to use the bcrypt algorithm to save passwords into database while creating web applications.I want to know what is the algorithm used to bcrypt a password ...
-2
votes
1answer
500 views

What type of hash is that [closed]

Hey do you guys know the algorithm used to generate this hash? 6874747a3b202063733437373676342f766c2f6e6520753933313538343931206175646960732039‌​353861383a3a36663836392f6e7a3325313638 It's ...
3
votes
2answers
382 views

How to Conceal/Detect PGP Symmetric Algorithm Used

When Symmetrically encrypting a file, (not signing, not an asymmetric encryption question), is it possible to conceal the encryption algorithm used, or is it already concealed, but just showing on ...
18
votes
4answers
2k views

Should I use own constants when using well known hashing algorithms?

I understand that it is important to use well known and well tested hashing algorithms instead of designing my own. For such there often are reference implementations available, which initialize the ...
1
vote
0answers
78 views

Traffic anonymization through routing - software and algorithms

I stumbled upon an interview with "the grugq" in which he is talking about how hackers anonymize their traffic, i.e. hide their original ip address (- this is also what I will mean by "anonymizing" in ...
1
vote
1answer
162 views

Advice on using encryption and hashing

I'm going to rephrase a question I asked earlier, as I don't think anyone understood what I meant. Bascially I'm writting a web based password locker, which can have multiple accounts; so that users ...
1
vote
1answer
87 views

Using encryption and hashing

I'm writing a project to securely store and share passwords between users, I've been doing tons of research into encryption algorithms, CSPRNGs, hashing algorithms, key stretching etc... I just want ...
0
votes
1answer
81 views

Private and public key need to have same algorithm?

The private and the public key from the cert must have the same algorithm, correct? EDIT: Yes of course pub / priv are a key pair. So this code would be legal, to be more flexible (e.g. ECDSA or DSA): ...
0
votes
4answers
242 views

Password Hashing Without a Unique Salt

I have a question about password hashing. This is not a question about the the BEST POSSIBLE method of hashing passwords, but rather a more utilitarian question about what is sufficient to hash a ...
2
votes
1answer
633 views

Is there a maximum allowed key size in the USA?

I've heard that using encryption outside military use has been illegal for a long time in the USA. However, I've also heard that when the regulation was updated, limits were put on encryption strength ...
-3
votes
1answer
180 views

Is there a way to attack the SHA-3, GOST, and WHIRLPOOL hash functions? [closed]

Is there a way to attack SHA-3, GOST, and WHIRLPOOL hash functions?
-1
votes
1answer
580 views

Current Encryption Algorithms? [closed]

What are some encryption algorithms that are currently in use by secure websites, by operating systems, or by Secure USB thumb drive manufacturers. I am trying to do research on differences in speed ...
-6
votes
1answer
201 views

What is the excellence of RSA vs my algorithm [closed]

I was wondering that what make RSA Asymmetric Cryptography Algorithm special. So I wrote a very simple algorithm that do the same work (Generate Public and Private Key) Now I want to ask you that What ...
1
vote
3answers
242 views

Hash algorithm without ASIC's

I want to design a new crypto-currency, with an algorithm which is different from SHA-256 or Scrypt. But in order to do this, I need to know the hash algorithm which is the hardest to make ...
1
vote
1answer
119 views

Which part is the longest when gerating RSA key pairs?

Whether I use openssll or gnutls's certtool, I end in a single threaded part which take several minutes. When I try to compile the libraries with auto-parallelizer advanced efficient tools. It sill ...
2
votes
4answers
653 views

For someone who has a key and ciphertext, is it possible to find out what encryption algorithm was used?

I am new in cryptography, and while learning a different questions pop up in my mind. Here is one of them. For someone who has a key and ciphertext, is it possible to find out what encryption ...
0
votes
1answer
215 views

Password algorithm to be integrated on a website

I have recently started a project to code a secure password protection algorithm to be used on both computers and mobile devices. As I have never done anything like it before, I am a bit unsure of ...
1
vote
1answer
127 views

Using secp256k1 and ECDSA with IKE

I just tried using an IKE daemon and EC certificates. I used the secp256k1 curve for key generation. The daemon claims signature scheme ECDSA-256 not supported by private key Now I am wondering ...
0
votes
1answer
241 views

Luhn algorithm applied to file access

I am in the following setup: given department ids, employee ids and file ids I want to check whether employee xy of department AB is allowed to access file f. E.g. department id = "012", employee id ...
0
votes
2answers
869 views

Algorithm to generate NTLMv2 Hash in PHP

I am trying to develop a PHP function to calculate NTLMv2 hash by providing server & client challenge, domain, account and password. The resulting hash appears to be not correct. Can someone ...
-1
votes
1answer
154 views

Permutation in Block Ciphers

I was reading some e-books to understand the basics of block ciphers and how it works in AES. As i understood, Permutation plays a big part in AES and Block Ciphers, Here is what i understood by ...
4
votes
1answer
207 views

What are covert channel algorithms?

Covert channels are normally used for communicating illegally or for some hidden communications, but I am trying to figure out what covert channel algorithms might be. Has anyone heard of this term ...
3
votes
1answer
212 views

Multiple encrypted messages known to have matching (unknown) content

A recent discussion regarding ways to keep data secure through multiple iterations of a program's execution (with repeated read/write operations) raised a question regarding known-plaintext attacks ...
-6
votes
1answer
5k views

Asymmetric encryption algorithms [closed]

What are the best asymmetric encryption algorithms out there? I am trying to use RSA in my project howoever I have read that it is not quite secure as other asymmetric encryption algorithms.
5
votes
2answers
1k views

Does chaos theory have any practical application in computer security?

Having learned about chaos theory at university some years ago, I've been curious ever since to know whether it has found any practical use in computing. Let me explain where I imagine it could be ...
0
votes
1answer
629 views

Determine hashing algorthim only with known input and output

Given the input: test A system generates the following output hash: 0x001F41B6A0534D3B851D69EFE6237F550100000010D5F4FC65E64BCFDBF2590212E4411C44942C6C734C00ACFE13B958DCAB3614 I do not know ...
7
votes
2answers
5k views

Salted hashes vs HMAC?

Most of discussions involving access credentials include references to "hashing salted passwords". Is this another way to referring to the HMAC algorithm or a totally different operation? Different or ...
7
votes
3answers
604 views

Is it a good idea to have a “master” password?

Though I do have a good memory of passwords, it is quite impossible to have one password per application. Yet, it should be... My current way to deal with passwords is to have five passwords and to ...
3
votes
6answers
528 views

Methods for remembering passwords around the web

What's the least painful way to manage passwords for user accounts that you have on various sites? I see only 3 options: Password manager. Passwords can be different and strong, but the downside is ...
285
votes
10answers
33k views

Is my developer's home-brew password security right or wrong, and why?

A developer, let's call him 'Dave', insists on using home-brew scripts for password security. See Dave's proposal below. His team spent months adopting an industry standard protocol using Bcrypt. ...
3
votes
5answers
1k views

Is there an asymmetric encryption algorithm that maintains the length of the plaintext?

I want to protect some registers by encrypting them without providing additional memory space. Is there a encryption algorithm that will maintain the length of the data to be encrypted? (i.e. ...
7
votes
5answers
576 views

How to prevent pay per show/click abuse?

We have a webapp. 3rd party websites put our banners on their pages (banner is a snippet of HTML). They are paid for it using "Pay per click" or "Pay per show" methods. So 3rd party website's owners ...
5
votes
2answers
292 views

How will security need to be changed if we can crack password hashes in quasi-polynomial time?

If we suppose that we have access to some form of generalized password hacking/cracking that can somehow find an $n$-bit password in time $O(n^{\log n})$, is there need for alarm? This question ...
7
votes
1answer
1k views

Identifying an unknown hash

During some of my research work I encountered an unknown hashed string. What I am curious about is the algorithm used to generate it. A factor that makes it interesting - the string contains an ...
3
votes
2answers
1k views

How realistic and possible is this sort of attack

I scanned a host with Nessus, in order to do a vulnerability Assessment, and one of the findings looked really odd to me. Nessus rated this finding's risk as Medium. The finding was, that a service ...
8
votes
4answers
675 views

How can we factor Moore's law into password cracking estimates?

How would we go about factoring Moore's law into exceedingly long password cracking estimates? Let's say we've got a 12 character password containing mixed-case alpha characters and numbers, i.e. ...