Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.
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1answer
121 views
RSA Signature - Multiple Use Weakness
I cite from Fundamentals of Computer Security (Chapter 7 on Digital Signature, Paragraph 7.3 on RSA Signatures, page 289):
Multiple uses of the RSA Signature scheme tend to weaken it. The way out ...
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votes
1answer
194 views
Why does my implementation of CBC mode only decrypt the first block correctly? [closed]
I have the following code that uses a CBC mode to encrypt a text by dividing it to 3-elements block. But it only works correctly on the first block which is xored with the IV.
...
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votes
2answers
71 views
Encrypting documents through a proxy key
Suppose I'm developing an app to secure a lot of documents. These documents were encrypted (say, using AES) with a key X.
This key X is basically the password that the user enters before wanting to ...
0
votes
1answer
386 views
What are open problems in cryptography? [closed]
I would be starting groundwork for my thesis in cryptography , I would like to know what are current open problems in cryptography, few I know of are
Fully Homomorphic Encryption
Functional ...
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1answer
401 views
iSeries (AS/400) Database File: password encryption
I am helping with a project in which an old software system on an iSeries is having a brand new .NET UI applied to it. It's going well... except...
In order to allow users to login and maintain ...
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0answers
25 views
Reverse engineering from known ID inputs and 19/20-digits outputs
I am currently having few samples of a hash encryption function as per following
ID Hash
542591 6896202108404922949
3210 7693203936755907764
2455 14877541378540063734
2275 ...
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votes
0answers
53 views
Will D-Wave's quantum computers ruin classical encryption? [duplicate]
D-Wave has commercially available 512-qbit quantum computers now. A lot of big names are taking it seriously. Google, NASA, and USRA have joined forces to start a quantum AI lab.
How far are we ...
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votes
1answer
96 views
Best way to create password manager [closed]
After some searching I wasn't able to find a password manager that fits me (able to sync from my own server, open-source, secure enough and browser auto complete). So, I thought that I will create ...
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0answers
30 views
Conditions for proving that a signcryption scheme is secure
If I'm able to prove that any scheme satisfies confidentiality ad unforgeability conditions, will it be a valid signcryption scheme, without explicit signature and encryption parts ?
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votes
2answers
102 views
Proper Way to Encrypt Data with Two Keys?
I'm going to develop a system that will have two keys. One supplied and generated by the system that's specific to an individual user and one from the user.
I plan on using AES.
Does it make sense ...
0
votes
0answers
19 views
ECKS-PS algorithm: searching in encrypted data; bilinear maps [duplicate]
I have found an encryption algorithm named ECKS-PS (published in a paper named 'efficient conjunctive keyword search on encrypted data storage system', written by Jin Wook Byun, Dong Hoon Lee, and ...
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votes
0answers
55 views
What is the significance of i^Q mod P = 1 and are there any special properties to be aware of?
I'm studying UProve, and one of the fundamental components of this technology is based upon the relationship between
i^Q mod P = 1
Lacking a specific name I can call this mathematical ...
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votes
1answer
225 views
How to break AES CBC with PKCS#5 padding?
If I have a string encoded with AES CBC with PKCS#5 padding, how can one possibly decrypt/crack it? What are the approaches that one can take to break its security?
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votes
1answer
120 views
Request for 1024-bit primes $p$ , subgroup $q$ and subgroup generator $g$
I need to find a prime $p$ of $1024$ bits with a $160$ bit sub group size $q$, such that $q|p-1$ , and $g$ is the generator of the sub group size $q$.
I'm looking for the numeric values of $p$ , $q$ ...
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votes
3answers
218 views
How to check the strength of an encryption algorithm?
I asking for advice on how to check strength of an encryption algorithm.
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votes
0answers
49 views
How compute encrypt and decrypt runtime for agorithm [closed]
I programming RSA algorithm is the following two function in java language in my thesis
...
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votes
0answers
55 views
How compared encryption algorithm in terms of efficiency
I doing to compare two algorithm cryptography. first algorithm is RSA cryptography and second algorithm is El Gamal elliptic curve cryptography. now I want a way to compare between two algorithm by ...
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votes
0answers
52 views
Intorduction to AES basics and where do i get online material [closed]
I'm final year undergraduate, i came across this encryption standarad and when i met my professor about this encyption standarad, he said ok go on with it, but he is not willing to guide me from ...
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votes
0answers
101 views
Is tokenization really alternative to encryption? [closed]
Much is being written all over the web that Tokenization is an alternative to encryption here , here and here
Is there some literature in crypto community on the same ? on formal treatment of ...
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votes
0answers
89 views
How to encrypt OpenVPN setup traffic [closed]
I have an OpenVPN server and a client that can successfully connect to said server. The traffic over the tunnel is encrypted. The tunnel works quite well.
However what is NOT encrypted (cleartext) is ...
0
votes
0answers
64 views
Need help with student project about IT security [closed]
I've been studying in university for computer security for 4 years.
All students have to make a course project by the end of year. And I have some problems with it.
I need help with the project's ...
0
votes
1answer
209 views
Problems with implementation of ElGamal using OpenSSL [closed]
I recently did an implementation of a semantically secure modification of ElGamal using OpenSSL. I'm implementing part of a book that i have, and several parts of the book do not agree with things ...
0
votes
0answers
57 views
What is this encryption algorithm? [closed]
I have a crashed old JSP system, while recovering I stopped since I am not able to find the right 2-ways encryption algorithm (OR encoding), so I need your help, below some examples of inputs and ...
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votes
0answers
116 views
How is TrueCrypt in-place system drive encryption implemented? [closed]
TrueCrypt supports encrypting a system partition while operating system is running.
From the docs:
Note that TrueCrypt can encrypt an existing unencrypted system
partition/drive in-place while ...
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votes
0answers
113 views
How do you ensure that a large remote file is encrypted? [closed]
On a general level, is there any way to ensure that a file has been encrypted? Specifically, is there any way to check this remotely using something like a checksum or key?
Here's a simplified ...
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votes
0answers
58 views
User data encrypt/decrypt [closed]
I was wondering which is the best way to encrypt and decrypt user data, to make it much more secure as it is possible?
I was reading about AES but i would like to know if is really the best way.
Me ...
0
votes
0answers
85 views
How do I protect user data at rest? [closed]
I want to encrypt the username, email, and password fields in the database AND encrypt user files at rest. How can I do this? I am aware of software such as Gazzang and since there is not cost ...
0
votes
1answer
209 views
File Encryption/Decryption in ECB mode [duplicate]
Possible Duplicate:
Removing Padded Value in Decrypted Message
I tried to encrypt and decrypt a file in ECB mode using AES Algorithm but I encountered one problem during decryption, I don't ...
0
votes
1answer
126 views
NTRUEncrypt - Choose the initial random polynomial
I'm trying to implement NTRUEncrypt but encounter some problems. I've finished all the basic functions that are needed for the scheme base on this Document, but I can't find an algorithm to check the ...
0
votes
0answers
104 views
Search tool to identify which algorithm is in use [closed]
I'm trying to identify what algorithm is encrypting / encoding / hashing passwords in a client system. I have samples of matching plaintext and ciphertext. Is there a search engine somewhere that will ...
0
votes
0answers
46 views
Elliptic curve Cryptography [duplicate]
Possible Duplicate:
Can we use elliptic curve cryptography in wireless sensors?
How to map message character to point lies on Elliptic Curve? how to ecc used in wireless sensor networks? ...
0
votes
0answers
109 views
What will be the way to go about deciphering this kind of cipher? [closed]
I've come across this cipher and have tried unsuccesfully to decipher it.
http://codepad.org/aea7Wuyl
The only 'hint' that I have gotten so far as to how I am supposed to crack it is the word ...
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0answers
100 views
Does anyone know which encryption scheme produces the following output? [closed]
My company is using software that stores an encrypted database password in a publicly accessible file. The encrypted version looks like this:
...
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votes
0answers
78 views
Is it neccesary to delegate / impossible not to delegate your cryptographic operations? [closed]
According to this guy SkyNet is coming. Should people delegate encryption/decryption to hardware and software which was not 100% their own design?
Compare with the original formulation of Kerchoff's ...
-1
votes
3answers
553 views
Does knowing common prefixes help crack blowfish?
I have strings that are if the form:
{static data}{changing data}
The beginning static data part is around 20 characters and is common to all strings. The last ...
-1
votes
3answers
317 views
Encryption technique performance evaluation
I've come up with a light weight bit wise encryption algorithm and seems good. Ive tried it with text and image input. But I've the following questions I would like to ask
What do you think of bit ...
-1
votes
1answer
121 views
How to bring little changes in DES algorithm
I thought of implementing DES modes of operation as a project...But my guide asked to change or to modify the DES algorithm in such a way to overcome drawbacks of DES...So is there any way to do ...
-1
votes
1answer
96 views
Matrix Multiplication of Bits
How to multiply the matrix of bits
example I have two 4x4 matrices of bits
...
-1
votes
1answer
59 views
what actually the function for e(g,g)^xy
I doing a project using ABE "Attribute-Based-Encryption" but i didn't understand what actually the function for $e(g,g)^xy$.
Just tell what's the calculation need to perform here. I gone through no of ...
-1
votes
1answer
92 views
What length should the padding be when encrypting or signing with RSA?
Does it matter what length the padding is? If so - what length should it be?
(Another point: Should it be random?)
-1
votes
1answer
101 views
Needing to encrypt plain sight information
Okay here are my requirements.
I need a solution that can do the following.
Lets say I have an encrypted piece of text with the value "20".
and I have UserA and UserB
I give UserA the Keys (/5 and ...
-1
votes
1answer
47 views
How to choose the appropriate public (i, m) and private (j, m) keys?
I studied some encryption and decryption and I have found some very interesting problem to solve on the internet. I hope I am writing to right site - there are so many in StackExchange otherwise I ...
-1
votes
2answers
55 views
Book Didactic Security Notions [closed]
I want study more about cryptography reading papers, but I have a problems to understand few concepts: security notions, random oracle model, IND-CCA, ... etc. I began study this concepts by internet: ...
-1
votes
0answers
47 views
can we do double encryption of a message without first key?
Lets assume $k_1$, $k_2$ are two keys and there can be any relation between them like $k2 = E(k1) $ that is key $k_2$ is encryption of $k_1$ using some other long term key or any other relation.
...
-1
votes
1answer
75 views
Which keys are necessary to decrypt Application data in a SSL connection?
I'm debugging an application which communicates between client and server using a SSL/TLS connection, and want to capture and analyze the sent data.
Are the client write keys and server write keys ...
-1
votes
1answer
41 views
Determine the Identity of Caller [closed]
Let me explain my situation.
I have a provider which is made up of a registration page and a web service. Online vendors (clients) register with the provider by providing details such as username, ...
-1
votes
1answer
41 views
Security system theoretical task [closed]
Imagine that you are responsible for implementation of a new security system in a company which boss insists on having new encryption algorithm.
Here are couple of solutions which has been presented ...
-1
votes
1answer
131 views
What is a good intro to cryptography book? [closed]
I'm a math major in college and its mostly theoretical like analysis, etc. and I have been interested in the idea of cryptography, so naturally I'm interested in possibly studying up on it a litle bit ...
-2
votes
3answers
316 views
Crypto-Compression Algorithms?
I was wondering, whether there exist such algorithms/enciphering procedures which both compress and encrypt the input data. That means, for starters, the output will be both smaller in size and ...
-2
votes
1answer
102 views
ASCII Message in TV show? [closed]
So I was watching a popular series tonight (Person Of Interest) when suddenly during a frame change I noticed a very quick blue screen with writing.
At the time I never thought anything of it as it ...
