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0
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1answer
169 views

How to do scalar multiplication and matrix inverse when variables are of size 1000 bits?

I am doing arithmetic operations on really huge numbers. For example, I am given six variables, a_{11}, a_{12}, a_{21}, a_{22}, x_1, and x_2. Although the above are math terms, these six variables ...
1
vote
4answers
776 views

Implementation ideas to store multiple files within a single file for faster access?

My requirement is to store a large number of files within a single file.The files stored could be anything like images, videos or simple text files as well. I want some ideas to implement the same. I ...
10
votes
7answers
12k views

Should I encrypt data in database?

I have a client, for which I'm going to do an Web application about patient care, managing patients, consults, history, calendars, everything about that basically. The problem is that this is ...
1
vote
1answer
468 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? ...
12
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2answers
2k views

How can I get my own encryption algorithm tested?

I've just developed a block cipher symmetric-key algorithm and I am using it in some of my products. I want to put it to real test. How would one go about entering their encryption algorithm into an ...
0
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2answers
557 views

How to access an encrypted INI file from C on an embedded system with little RAM

I want to encrypt an INI file using a Delphi program on a Windows PC. Then I need to decrypt & access it in C on an embedded system with little RAM. I will do that once & fetch all info; I ...
2
votes
2answers
307 views

help for choosing an encryption method for a database column

I'm storing some phone numbers in the database which should kept totally secret (they're supposed to access via web). BTW, because of the position of these people, I need to prevent any chance for ...
0
votes
3answers
1k views

How does eMail encryption work?

I have been going over YouTube watching videos on eMail encryption and everyone seems to explain it from a different perspective. Some do it for a CompTIA exam while others just provide a primer. Here ...
0
votes
1answer
1k views

How do PGP and PEM differ?

Email messages are sent in plain text which means that the messages I send to Derpina are visible to anyone who somehow gets access to them while they are in transit. To overcome this, various ...
0
votes
3answers
430 views

What encryption algorithm/package should I use in a betting game?

I have a betting type site where I publish a number (between 0-100) that is encrypted. Then after a period of time, I would review what the number is and prove it with a key to decrypt the encrypted ...
3
votes
4answers
579 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 ...
1
vote
1answer
201 views

How to handle encryption key with a large development team?

If we have a large development team, say 100, and we would like to keep our encryption key hidden from developers who are not directly involved in the encryption module/algorithm, what are some best ...
2
votes
1answer
6k views

HTML5 localStorage and encrypted sensitive data

I'm looking for a way to have a website remember sensitive data, but without actually storing it server side. And I was looking at HTML5 localStorage to do it. Here's the plan as I see it. User ...
2
votes
1answer
226 views

How to encrypt data using the private key?

I understand that in asymmetric crypto systems: The public key is generally used to encrypt data and only the private key can be used to decrypt that data. It's trivial to derive a public key from ...
4
votes
4answers
1k views

Should I perform encryption in the front end or within the database?

I want to store an encrypted string (specifically, email addresses) in a database. I'm currently using Python and MySQL. I was initially going to use MySQL's AES_ENCRYPT/DECRYPT to handle it, but then ...
1
vote
1answer
355 views

Books or guides regarding secure key storage and database encryption [closed]

I have an idea for a SaaS product I want to create, however, this product will store extremely sensitive data that needs to be encrypted at rest. The trouble is not so much the encryption, but the ...
4
votes
3answers
2k views

URL Encryption vs. Encoding

At the moment non/semi sensitive information is sent from one page to another via GET on our web application. Such as user ID or page number requested etc. Sometimes slightly more sensitive ...
5
votes
3answers
5k views

How does a web browser save passwords?

How do current web browsers (or mobile mail clients and any software in general) save user passwords? All answers about storing passwords say we should store only hashes, not the password themselves. ...
0
votes
1answer
345 views

Best Practices To Build a Product Registration System?

What are some practices I should use in a product registration system I'm building? I likely can't stop all malicious hacking, but I'd like to slow them down a great deal. (Note, I know only PHP.) I'm ...
4
votes
3answers
439 views

Login into application at startup

Short version: I want "Login on program startup" checkbox like in Skype, for example, but don't know how to protect saved credentials securely. I'm writing client application which, before doing ...
3
votes
2answers
747 views

How to handle encryption key conflicts when synchronizing data?

Assume that there is data that gets synchronized between several devices. The data is protected with a symmetric encryption algorithm and a key. The key is stored on each device and encrypted with a ...
5
votes
3answers
9k views

How do I encrypt the source code on the webserver?

I have a web application developed using Python, HTML, CSS & JavaScript. The customer installs it in any of their own Machine and uses it through their LAN. In short the customer sets up the ...
21
votes
4answers
4k 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 ...
5
votes
4answers
578 views

Multiuser System With Encrypted Database

I am currently developing a hosted solution in ASP.NET using MVC3 and Entity Framework. This product will then be made available to a number of clients as a hosted solution. As the data stored by ...
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votes
5answers
1k views

Paranoid Encryption

Call me paranoid, but I really like to keep my stuff secret, but readily available on the cloud. So, asking this question. How safe and reliable is encryption software (e.g., truecrypt)? The reason ...
2
votes
3answers
663 views

Do you know of any encryption techniques used to validate url redirection

I'm adding a click-tracking feature on my website to track click-thrus for my advertisers. So, on my site, instead of having a direct link, I link to my re-direct page passing the destination url as ...
1
vote
1answer
90 views

Random number for HTTPS MAC

Recently I found that Netscape used quite simple algorithm to generate random number for Message Authentication Code to establish an HTTPS connection (Nestscpe used time, process identification number,...
11
votes
3answers
1k views

Where do you use ROT13?

I was reading through the docs for vim, and noticed there's a shortcut, for example g?w would transform the next word using ROT13. I also know that you can change the encoding of a Python file to ...
3
votes
3answers
370 views

How would I go about changing encryption methods on existing passwords?

If I have an application that is using a less secure method for storing passwords, such as SHA-1, how would I go about converting to SHA-256 or SHA-512?
5
votes
2answers
4k views

do I need French export compliance approval to submit an iOS app that uses encryption? [closed]

My company just (5th July 2011) received the following email from Apple: Starting in the first week of July, apps that meet the following criteria are required to comply with French ...
6
votes
2answers
678 views

Licensing issue for RSA and Rijndael algorithms

I'm using .Net to build a commercial application, i.e. a secure chat application. This application is using RSA and Rijndael algorithms. Do we need licenses for using RSA and Rijndael algorithms for ...
0
votes
5answers
258 views

How to handle the problem of modified encrypted files [closed]

I have a simple encryption/decryption application that I am testing to learn more about security. I found out that if the user modifies the encrypted file, then decryption fails because the hashing ...
0
votes
1answer
438 views

Legal Requirements for Software Makers

Since the Legal site of Stack Exchange isn't ready quite yet, I figured this would be the best place to ask this question. What are, if any, the legal requirements (or online resources for finding ...
3
votes
2answers
396 views

What encryption method should I use?

I am looking for some information on encryption. Here's what I'm trying to do: Get unique information from our customer (an ID or something) Generate and encrypt some data on our side (using the ...
8
votes
2answers
298 views

Data encryption/protection - where to find info about high-level best practices [closed]

I feel that no one in the group I work in, myself included, really groks encryption and security, or the reasons behind making certain decisions. For example, we recently had a conversation regarding ...
10
votes
2answers
183 views

Saving critical data in (third party) databases

How do you save important(privacy-wise) user data like SSN, Credit Card Numbers and Addresses in databases? Scenario: Only data which needs to be available is saved. For eg, SSN is saved because the ...
5
votes
4answers
296 views

Copyright issues with encryption algorythms

I'm developing an application for Android/Java. This application is a kind of password manager, so I'm storing encrypted passwords under the hood of a master password. There are a number of encryption ...
5
votes
1answer
2k views

Are PGP keys as good for certificates as X.509 keys?

I'm working on a decentralized transaction processing system that needs both authentication and general encryption, and I have a design decision to make: should I use PGP or X.509 certificates? While ...
7
votes
3answers
639 views

Cross border data obfuscation and how to deal with it?

I am currently facing a situation where I will need to obfuscate data for legal reasons (these are countrywide rules and not specific to me) I will still need to work with teams outside this area who ...
2
votes
4answers
120 views

How to restrict viral file sharing

So I have a website I would like to make that would essentially be selling files. For the sake of discussion let's say that these files are like the raw text of a book. If somebody buys a file from my ...