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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Storing Private Keys Generated on Server with specific User's Password Securely

I am currently building a system (PHP Web Application Framework) that creates an RSA Key Pair for a user to allow other users to send secure information from one to another. The public key is ...
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2answers
551 views

S/MIME verification

I am getting emails with smime.p7s attachments. when I look at my mail on my Linux box, I can see base64 encoded block in mail body. I can extract that block and open it on Windows using certmgr and ...
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4answers
730 views

User-to-user encryption in addition to SSL for mobile phones?

I have learned that SSL is a protocol to implement machine-to-machine encryption and that there are protocols, like PGP, which implement user-to-user encryption (end-to-end encryption). There are ...
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Difference between Encryption and Verification certificate

What is the difference between the Encryption certificate and Verification certificate in Outlook? When exchanging certs, it just requires a digitally-signed message to be sent. It seems as though ...
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3answers
2k views

Can email be encrypted before it reaches the mail server? If not, is there something that would allow something like this that's being worked on?

I was thinking about hosting my own email (own email server) instead of using Gmail. But then I realized I could never host my email on a server where I'm also hosting Wordpress. That is because I ...
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2answers
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Strongest cryptographic algorithm available in PHP 5.3

Which options are available in the default installation and which ones by third-parties like extensions or frameworks? P.S. By Cryptography I mean algorithms which could be decrypted, not one-way ...
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1answer
216 views

Share or not share public key for servers?

In order to encrypt communications from our (custom) client to our (custom) servers our current scheme is a bit like this: Client uses the bundled public key A to encrypt some random key material. ...
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2answers
69k views

Security comparsion of 3DES and AES

Which one is more secure and least possible to be broken through cryptanalysis AES or 3DES (no matter performance)? I need to use encryption for my projects to store and secure sensitive information ...
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2answers
755 views

Test Android Secure Encrypted Traffic

For testing android traffic encryption I have configured a VPN client in my phone. What simple test I can perform in my home wifi network to verify that the traffic is really encrypted and secure?
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1answer
945 views

How does the YubiKey Validation Server work from an encryption perspective?

Many YubiKey servers rely on the free cloud hosted authentication that comes with the product, but I'm interested in keeping all cryptographic material in my control. For that reason I am looking at ...
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1answer
274 views

Combining MAC and Encryption

What is the most preferred and secure way of combining both Encryption and MAC. There was a lecture on different combining strategies adopted by different protocols on a cryptography course by ...
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2answers
366 views

encrypted cloud storage with partial local copy

Is there a cloud storage solution with the following features: partially copied locally. Not fully like dropbox so it can be larger than the local disk. Not fully in the cloud but just a local disk ...
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5answers
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How can encrypted traffic bypass the Great Firewall of China when it is being blocked?

The Great Firewall of China is controlled by the government and has put in place a "learning algorithm" to block unapproved encrypted traffic. The only way to get encrypted traffic through the ...
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2answers
300 views

Security concern to implement a web based remote desktop

I am implementing a web based remote desktop application.Through this application client can connect to the server and can access the server using JSP/Servlet Java robot class. I can configure the ...
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4answers
2k views

Future proof encryption possible in theory?

Let's say I have a message that I want to keep safe for the next 100 years. Is it theoretically possible? Let's say the message is unique (raw picture data, raw video video data, raw text data) and ...
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2answers
298 views

How do I correctly select and use a modern symmetric block cipher?

I have founds lots of DON'Ts with Google but so far, no simple resource that would explain to someone like me who knows that he is not smart enough get this right without help how to use correctly a ...
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5answers
357 views

Secure login feature with low CPU power

I'm developing a program that contains a login function in C++. The problem is that I don't know how to develop it in my situation. I want to run the software on a raspberry pi, it only has a CPU ...
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2answers
230 views

If two endpoints establish a mutual authenticated connection (TLSv1.0) is the medium between the endpoints a concern?

What are the vulnerable areas when two endpoint connect via TLS? Does the physical layer or data link layer a factor of security concern between the two endpoints? Does it matter in terms of security, ...
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1answer
252 views

Is there a tree hash form of MAC that can be used when encrypting data for storage on S3 using multipart upload?

I am storing files on S3, some of which are very large, and need to be stored encrypted. I had planned on using Galois Counter Mode since it includes the MAC, however this won't work with multipart ...
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1answer
1k views

Secure query string parameters

I have an application which use the Thick box jQuery component to open a popup page . And I pass my parameters in query string like this : <a id="btnShowPopup6" runat="server" class="thickbox" ...
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1answer
3k views

Crack plain RSA given p, q and e

How would one find the secret key in a simple RSA encryption when given p, q and e?
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2answers
1k views

Sending data form registration forms

I understand that sending data from the user to the server, unencrypted, is a bad practice. That is logical. So how do I encrypt 'userside' and send the data to the server in encrypted form? Can ...
9
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1answer
945 views

Reversible, recoverable user data encryption scheme

From this earlier question, I have a general need to obfuscate a set of third-party credentials stored in a user account, which are then used in an internal Winforms software client. The scheme from ...
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1answer
214 views

What physical, electronic, and software characteristics are important in a smart card?

I'm evaluating smart card readers to store a number of private keys, but don't know where to start. What criteria is important regarding smart cards and preventing the extraction or unauthorized used ...
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3answers
4k views

KDC(Key Distribution Center) vs Asymmetric Key Exchange

Today I was reading notes about cryptography and I came across a problem that exists in Symmetric Key encryption, which is how to share the secret key across the network. 1st Method : Make use of ...
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2answers
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What hardware technology (GPU, FPGA) is fastest at generating RSA keys?

I'm interested in generating RSA keys in rapid succession and am looking for the correct hardware to so. I think what I'm looking for is very similar to a brute force attack on RSA keys, but my ...
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2answers
5k views

Is it possible to decrypt symmetric key encryption without the key?

I have an document encrypted with a symmetric key. The only information I have is that the key is shorter than 64 bits. Is there any way I can decrypt it? If yes, how?
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5answers
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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. ...
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2answers
6k views

WPA2 Enterprise AES encryption key size?

I have recently set up a RADIUS server with EAP for my wireless router, however, I have some questions about the key size and how WPA2 enterprise (AES) works in general. I have read that in ...
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1answer
83 views

how to stop write downs

Consider a scenario with two security levels, Alice and Bob. Bob is Alice's boss. Bob must be able to read Alice's documents but not write anything to her documents. I am using encryption keys to ...
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3answers
2k views

Is it preferable to perform encryption using database functions or code?

Several databases I am familiar with provide functions or modules for encryption. Examples include dbms_crypto for oracle databases and built-in functions for MySQL. Most of the commonly used ...
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1answer
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Encrypting data for Android mobile app

I am creating a mobile app for Android. This is my first mobile app by the way. I have decided to store data used in my app in a SQLite database in the target Android device. The data I am storing ...
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3answers
898 views

Public key in SSL protocol

I have gone through many of the posts including My understanding of how HTTPS works (gmail for example). Everywhere it's mentioning that before creating a https connection, the browser verifies the ...
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3answers
149 views

Encrypt a file, based on access

Is it possible using encryption keys to encrypt a file so for example some one will full access can read it all but some one with little access can only read say the top paragraph
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1answer
1k views

How to Protect the Password Stored in a Configuration File? [duplicate]

Possible Duplicate: Standards for encrypting passwords in configuration files? I am not sure if this question has been asked before here, I wasn't able to find it. So, please feel free to mark ...
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3answers
694 views

Two step encryption

Consider the following user case: I have some sensitive data (eg: credit card number) I encrypt this data and store it in the database Now I want to send this data to a user X, but I don't want to: ...
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5answers
787 views

HOWTO : Email encryption in a browser

I have read about encryption and I think it's a good idea for me to encrypt my email. I run ubuntu 12.10 and use Firefox for browsing. In my quest for learning how to use gmail/hotmail to send and ...
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3answers
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Choosing a session ID algorithm for a client-server relationship

I am developing an application which has a client-server relationship, and I am having trouble deciding on the algorithm by which the session identifier is determined. My goal is to restrict ...
2
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4answers
1k views

Code, Data and Passwd encrypted? sqlplus $USER/$PASSWORD@$ORACLE_REMOTE_SID

Lots of our *NIX scripts use "sqlplus $USER/$PASSWORD@$ORACLE_REMOTE_SID" I know that not good to have clear text password in scripts (there is no alternative at the moment). But question is the ...
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6answers
800 views

Security of email [duplicate]

Possible Duplicate: How commonly are SSL/TLS or S/MIME used by e-mail providers? Say, Alice uses gmail and Bob uses hotmail. Alice wants to send an email to Bob. Alice goes to gmail website ...
5
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2answers
6k views

How effectively can ISPs detect illegal file sharing?

Recently the USA passed a law requiring ISPs to spy on their customers' internet connections to check for illegal file sharing. I assume that they would do this by sniffing packets, but doesn't this ...
2
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1answer
269 views

Design of Initialisation Vector

I understand that an IV (initialisation vector) should be both unique and unpredictable, but I have found little guidance as to which is most important. For an AES cipher I have a block size of 128 ...
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5answers
690 views

Does shuffling a hashed password increase its security?

I am making a web app and I'm now stuck on making the login secure. I'm thinking of adding a salt to a user-inputted password and then hash it. (md5 or sha for example) and then I will reshuffle the ...
1
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1answer
232 views

How safe is WSIT username authentication with symmetric key?

I have an ajax-ws web service (exposed via glassfish) that uses username authentication with a symmetric key to encrypt and authenticate clients(link). How secure is this mechanism? Is this enough to ...
3
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1answer
259 views

Can we use a public key scheme for performing cryptographic commitment

Is it possible to use a public key scheme such as DSA as a commitment scheme? Are there any problems with doing this?
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1answer
502 views

API Design Model - Client Side Encryption

I'm currently designing a API Model to use. A user will have a 'secret_api_key' and a 'public_api_key'. They will send a request to my server with the public key, the form data, and then a hash. The ...
2
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1answer
348 views

White-Box Cryptography Questions and References

I have recently started reading about White-Box Cryptography and looking at references/papers/web sites. A have a few questions I was hoping to get guidance on. As far as I can tell, WBC has ...
2
votes
1answer
311 views

What security risks are involved with sending data over the internal network on Rackspace Cloud servers?

What are the risks involved with sending unencrypted data over the internal network with Rackspace Cloud Servers? Assume the interfaces use iptables to filter IPs and ports so they only accept data ...
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3answers
2k views

How secure is aSSL (javascript)? Does it effectively mimic SSL?

Some of you may be familiar with the aSSL project, which uses AJAX/PHP to mimic the SSL protocol. It uses RSA 512 or 1024 for the keys, and AES for the actual data. It looks impressive to me in ...
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6answers
4k views

Principle of asymmetric algorithm in plain english

I was giving a presentation to my colleagues about cryptography basics in which I explained about asymmetric algorithm and its use. One of the common question from the audience about asymmetric ...