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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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 ...
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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 ...
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1answer
191 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 ...
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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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0answers
106 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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0answers
110 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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52 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 ...
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84 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 ...
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58 views
What is cross-certification [closed]
What does cross-certification mean? Can I program my app to accept all certificates that are cross-certified by a certain CA? How common practice is this?
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1answer
196 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 ...
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0answers
222 views
How to calculate a key for Hill Cipher? [closed]
I need an easy way to calculate 3X3 key matrix to encrypt a 256 characters text ?
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1answer
121 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 ...
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0answers
102 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 ...
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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? ...
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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
99 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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0answers
77 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 ...
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3answers
537 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 ...
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3answers
305 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 ...
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1answer
116 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 ...
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1answer
91 views
Matrix Multiplication of Bits
How to multiply the matrix of bits
example I have two 4x4 matrices of bits
...
-1
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1answer
84 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?)
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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 ...
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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: ...
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0answers
38 views
How to decipher this morse-like code message? [closed]
I found this little string that looks like Morse Code, but instead of dots (dits) has hearts symbols, I tried to change the hearts for dots, but I was not able to get any redable text.
...
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votes
1answer
40 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, ...
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0answers
25 views
Create groups of keys [closed]
I looking for a solution to encrypt, sign documents or email a key group and send to one customers. The group of keys are had already created user keys and I would like to use them.
Is not an option ...
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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 ...
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1answer
99 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 ...
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votes
3answers
303 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
91 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 ...
-2
votes
1answer
60 views
Cryptographic Primitive Method
Is there any cryptographic primitive bijective (one-to-one and onto) function for creating cryptographic tools like symmetric encryption/decryption, Hash code generator, MAC, HMAC and Random number ...
-2
votes
1answer
119 views
Securing a lookup table [closed]
I am looking for a secure approach to handing the following situation:
You're given a string that means something. It contains parts of something larger, each of which is clearly understood. For ...
-2
votes
1answer
321 views
Is a steganographic technique which has a universal decoder novel/secure? [closed]
I've come up with an approach to steganography which needs review of both its cryptography and its math. There's a complete working implementation at https://github.com/bramcohen/DissidentX and the ...
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1answer
179 views
Multi layer encryption with ECB mode [closed]
if i use the 2 of the same key with 2 of the same algoritm when encrypting in ECB like when i have 2 blocks of the same color and i encrypt the 2 blocks with the same color the cipher text should
not ...
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votes
1answer
100 views
AES implementation in java that allows key of 320-bit length [closed]
I need an implementation of AES(Rijndael) in java that allows use of a 320-bit key.
Please suggest a reliable implementation
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votes
1answer
424 views
Advantages of each encryption mode [closed]
What is the advantages of each encryption mode to other encryption mode..
for example what are advantages of CBC to PCBC, CBC to CFB
just like that.
so that I can filter what would be the best ...
-3
votes
1answer
68 views
Can someone help with the following hashes? [closed]
Here are a couple of hashes. I feel it should be easy (simple base conversions?) to decode them but I haven't succeeded so far. Can someone help?
...
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3answers
147 views
Why shouldn't one build a MAC by XORing multiple message blocks?
I found this simple proposal for a MAC algorithm:
Let the MAC of message M (which consists of message blocks $M_1$,$M_2$, ..., $M_n$)
be the AES encryption with key K of the XOR of all the ...
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0answers
63 views
RSA Encryption Sckeme [closed]
Can anyone help me with this question?
A and B want to exchange encrypted messages; specifically, B wants to send a message M
written in binary format to A, which needs to be encrypted. They agree on ...
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votes
1answer
32 views
decrypting unreadable string [closed]
Does anyone recognise this type of encryption? These are phone numbers consisting of 10 digits and starting with 0 but the encrypted text width is not 10 and does not start with the same character.
