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0
votes
1answer
70 views

Snapchat clone: How do I secure pre-downloaded notifications so that they cannot be opened outside of the app?

Say I'm making a snapchat clone app for Android and iOS. Let's say that I get a snapchat from Baz. I want to pre-download the audio for this snapchat. However, as the developer, I want to secure this ...
2
votes
5answers
227 views

secure photos on server [closed]

I would like to hear advice from the more experienced developers. The project is now in the design stage. It's mobile application and a simple web application. Content is pictures, comments, personal ...
25
votes
10answers
4k views

What should web programmers know about cryptography?

Should programmers who build websites/web applications understand cryptography? I have no idea how most crypographic algorithms work, and I really don't understand the differences between ...
8
votes
5answers
538 views

Where to store the private key?

Say I want some parts of my software to be encrypted. For example, the credentials for a database, etc. I need to store those values somewhere, but doing so in cleartext would make it easy for an ...
0
votes
1answer
246 views

deciphering columnar transposition cipher

I am looking for an idea on how to decipher a columnar transposition cipher without knowing the key or the length of the key. When I take the cipher text as input to my algorithm I will guess the ...
25
votes
1answer
792 views

What are the advantages and disadvantages of cryptographically signing commits and tags in Git?

So someone peer reviewed my work, and he told me that I should always sign my commits and tags cryptographically. When asked why, he didn't know to explain it to me, and said "It's just a good thing ...
0
votes
0answers
84 views

Distributing cryptographic software on GitHub

I am developing a cryptographic program and i am planing on distributing it using GitHub, But there are some regulations on the export of cryptographic software, how do make myself not liable if ...
7
votes
3answers
314 views

Using a standard localised data cryptography pattern with an ASP.NET MVC3 application

I have been given the task to rejuvenate an existing Human Resources application from Access into ASP.NET. This is a strictly internal application, and I have no problems developing it within our ...
-1
votes
2answers
327 views

What is the best programming language to do crypto running time measurement? [closed]

I am trying to measure the running time of different crypto algorithm. e.g. how long it takes to encrypt/decrypt a block of plaintext. May I ask if C with OpenSSL is the best PL to do this?
1
vote
2answers
451 views

How to manage my private key for signing .NET assemblies?

I write open source .NET class libraries as a hobby and thought about signing them. I can get Visual Studio to generate me a password protected public/private key pair and save it as a .pfx file, but ...
1
vote
1answer
312 views

Are python's cryptographic modules good enough?

I mean, say you were writing professional grade software that would involve sensitive client information. (Take this in the context of me being an amateur programmer.) Would you use hlib and hmac? ...
2
votes
1answer
295 views

What do these symbols mean? I'm trying to understand them to make an app

What do the symbols ⊞ and ⊕ mean? I'm trying to understand them to make an app. It's on http://en.wikipedia.org/wiki/File:XXTEA.png
1
vote
1answer
306 views

Using a random string to authenticate HMAC?

I am designing a simple webservice and want to use HMAC for authentication to the service. For the purpose of this question we have: a web service at example.com a secret key shared between a user ...
3
votes
4answers
499 views

Public-private key pair handling on a Windows ecosystem

I've been thinking about how to architect an infrastructure for one of our business applications with the following requirement: Data written by some user can only be read by that user and his ...
8
votes
4answers
4k views

Can I watch a SHA-256 do its magic visually?

Is there any possible way I can download a program, type in a message, and watch the program display visually what iterations are going on and what formula the character is being fed through all the ...
7
votes
1answer
2k views

Java Cryptography Extension

I was told that in order to support AES256 encryption inside my Java app that I would need the JCE with Unlimited Strength Jurisdiction Policy Files. I downloaded this from Oracle and unzipped it and ...
1
vote
4answers
265 views

MD5 implementation notes

While going through RFC1321, I came across the following paragraph: This step uses a 64-element table T[1 ... 64] constructed from the sine function. Let T[i] denote the i-th element of the ...
0
votes
3answers
266 views

Lightweight external authentication - looking for an OpenID alternative

We have a "backend" area for performing maintenance/debugging tasks on most of our developed websites and (obviously) this area requires authentication. Most of these websites have their own ...
2
votes
1answer
248 views

What alogrithm is used on the smart cards for the DNSSEC Trusted Community Representatives?

I've been doing some reading about DNSSec and am interested in the algorithm that they chose to use when splitting the trusted key up between the 7 Trusted Community Representatives (TCR). I ...
0
votes
1answer
3k views

C programming in Windows 7 [closed]

Which is the best book and what are the best tools for C programming in Windows 7? Would using C in any way hinder me when it comes to using the Windows API as opposed to using C++ or C#? I would ...
2
votes
1answer
218 views

Book on network cryptographic protocols [closed]

I am looking for a book that describes in fair detail the most common network cryptographic protocols such as SSL, TLS, SSH, HTTPS, etc. I already have some books that cover the underlying ...
21
votes
4answers
2k views

Programmers' concerns about export restrictions from the United States

Which aspects do I need to consider when designing and publishing software that must meet the US export restrictions for cryptographic software? Wikipedia says that there are various categories which ...
4
votes
1answer
300 views

What was the earliest use of cryptographic tokens in URLs?

I was wondering: it now seems to be more and more common to see people/framework putting cryptographic tokens in the URLs their webapps are generating (to prevent quite effectively against quite some ...
4
votes
8answers
3k views

Generating every combination of a 32 character alpha numeric string?

Is it possible to generate every possible combination of a 32 character alpha numeric string? If so, how long would it take on today's fast computers? My lecturer at university said it's impossible, ...
1
vote
4answers
174 views

I need a public cryptography system that works on small keys [closed]

I just need it to support signing and signature verification. I need it to have public and private keys that fit each in 16 bytes. The signature itself must fit 16 bytes. I don't really care about ...
5
votes
6answers
1k views

How can I prevent users from creating multiple accounts on a web site?

I'm building a site that needs to guarantee user reputation scores are accurate by preventing users from creating more than one account, at the cost of decreased user signups. So far, the only ...