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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Is this Data Encryption/Storage Method Secure?

Let me first say that I know it is a bad idea to store sensitive information in a mysql database, so please don't respond by saying "DON'T DO IT" or something to that effect. I am building a website ...
12
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0answers
856 views

MPPE-Send and Receive key derivation from MS-CHAPv2

I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is ...
14
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2answers
12k views

Decrypting TLS in Wireshark when using DHE_RSA ciphersuites

How can I decrypt TLS messages when an ephemeral Diffie-Hellman ciphersuite is used? I am able to expose the premaster secret and master secret from the SSL Client. Using that, how to decrypt the ...
8
votes
4answers
737 views

Do honeywords add any real security?

This paper proposes the concept of honeywords for detecting if a password database has been compromised. As far as I understand it works like this: You save n password hashes for each user, one that ...
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1answer
1k views

Do the Owncloud clients use encryption when transferring files to and from the server?

Do the Owncloud clients use encryption when transferring files to and from the server? I understand that files are stored un-encrypted on the server, but I’m wondering if they are secured during ...
21
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4answers
10k views

Are phone calls on a GSM network encrypted?

When I make a call on my cellphone (on a GSM network), is it encrypted?
4
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1answer
282 views

Confidentiality without Encryption - A way to circumvent Internet censorship

Nowadays we see that countries like China and Iran detect and block all encrypted connections as a way to prevent their citizens from communicating over the Internet freely. Although encryption ...
5
votes
1answer
594 views

Database encryption or filesystem encryption?

Recently I've been working on some data which, although not directly governed by any infosec laws, is sensitive enough to warrant being encrypted. I'm interested in finding out about best practises ...
4
votes
1answer
683 views

How to interpret specific NIST 800-57 cryptoperiod advice?

We are uncertain how to interpret a specific piece of NIST 800-57 - to wit, how long a symmetric key cryptoperiod should be when originator usage and recipient usage begin concurrently. The short ...
0
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1answer
144 views

Can anyone determine what kind of encryption this is? [closed]

Here are some examples of the encryption: J01A062YLMP1 J01A06OEPMP1 J08A07GSVMP1 J08A0625YMP1 K01A06IE2MP1 K01A06GRKMP1 W08A06ZTYMP1 I know the first letter corresponds to a brand, the last 3 ...
3
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1answer
342 views

Security of Javascript in mobile browsers

Is Javascript on a mobile browser more secure than Javascript on other types of systems? For instance, if I have a site that includes some client-side (Javascript) encryption code, with the intention ...
2
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1answer
351 views

How to Verify the Identity of the Caller of a Web Service

I have a server which is composed of a page and a web service. The web service is intended to be used by a Windows Phone mobile application that I will develop myself. Now, my question is, how do I ...
3
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1answer
107 views

Windows Phone and Hardcoding Values

Let us say that I have a Windows Phone application. If I hardcode a private key in the Windows Phone application, can people extract it once the application is released to the public on the Windows ...
5
votes
1answer
4k views

Is an encrypted connection to MS-SQL Server really safe?

Quick intro: Small company, VERY limited resources. I pretty much do everything including coffe. I am a programmer, not a security guy. That's why i ask you... We have an MS-SQL 2008 Database ...
1
vote
1answer
126 views

SSL Communication and Proxy

Let us say that I have a client and a server communicating using SSL. If a hacker sets up a proxy between the client and the server, will he be able to decrypt the data which is being sent?
0
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1answer
471 views

What is a man in the middle attack?

My university provided me with the following slide which is confusing me: From my understanding, what is happening here is that Trudy (Person in the middle) is pretending to be Alice. Bob then ...
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1answer
2k views

Symmetric Key Cryptography vs Public Key Cryptography [duplicate]

I understand what the two are so need to go into detail about that, however what I'm curious about is in what kind of situations would we use one over the other? It feels to me as if Public Key ...
0
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1answer
80 views

Determine the Identity of Caller

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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1answer
6k views

Asymmetric encryption algorithms [closed]

What are the best asymmetric encryption algorithms out there? I am trying to use RSA in my project howoever I have read that it is not quite secure as other asymmetric encryption algorithms.
8
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2answers
1k views

Is ECDSA breakable by quantum computers?

Is ECDSA secure from quantum computers? Will quantum computers be able to calculate it's private keys from the knowledge of the public key once there are working quantum computers?
3
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1answer
175 views

Clarification on Digital Certificates

I used the makecert tool to create: self-signed certificate client certificate These are the commands I used: makecert -n "CN=MatthewCA" -r -sv MatthewCA.pvk MatthewCA.cer **for self signed ...
2
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1answer
260 views

Sending Digital Certificates

I used the makecert tool in order to create: a self-signed certificate a server certificate using the self-signed certificate a client certificate using the self-signed certificate I then ...
2
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1answer
379 views

Security Certificates - Tools to Generate Security Certificates

I want to create a self-signed certificate that will be installed as a trusted certificate authority. I then want to create another two certificates which are signed using the private key of the ...
2
votes
0answers
131 views

Is the GTK or MIC in the unencrypted portion of a WPA protected frame?

In order to decrypt traffic you must have all 4 portions of the WPA Handshake. In WPA protected data frames, is there an unencrypted portion of that frame that has some sort of identifiable value to ...
0
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1answer
605 views

PCI 3.6.6 cryptographic key procedures include split knowledge

My question is, if you run your own company and there are no employees and you still qualify under assessment D what do you do in a case like this where it is requiring 2 or more people? On a related ...
1
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1answer
5k views

The request was aborted: Could not create SSL/TLS secure channel Exception

Let me explain my situation. I created a self-signed certificate and installed it in the Trusted Root Certification Authorities section in MMC. I then created two certificates using the self-signed ...
2
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1answer
122 views

Authenticating a ciphertext

what can be considered as a downside of authenticating a ciphertext? For example, can we say drawback of authenticating a ciphertext is that we lose repudiation, for example, we can't prove to the ...
3
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2answers
225 views

Are there any serious problems with this method for generating single-use tokens?

I need your advice on the security of this design. I have a scenario whereby a server application and a smart card application need to share a value e.g. 52, which has been encoded in a long decimal ...
3
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4answers
395 views

Is it possible to configure any of wifi protocols so that the network is undetectable?

I am wondering if it possible to configure my DD-WRT router so that the wifi network I am using is undetectable - impossible to tell if there is any network broadcasting even if there are clients ...
10
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4answers
3k views

Truly deniable encryption

What tools can be used to make truly deniable encryption? Suppose, authorities can use any force to make you open your passwords. Truecrypt can have only one hidden container, which means that ...
11
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1answer
490 views

“Please Enter Nth Character” without HSM

This question has been asked a few times, but always in the format "How does examplewebsite.com implement their 'please enter xth yth and zth characters of your password' function?" And the ...
4
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1answer
204 views

Switching to new encryption method (without losing data?)

Let's say you have a website that provides a service of some kind. Users can log in, they can store some kind of data, and there's various types of encryption in place to keep it all safe. Passwords ...
-3
votes
2answers
579 views

how to identify plain text from cipher [closed]

I am trying to find what encryption algorithm has been used in this code original text: 11011698 encrypted text/cipher: uIC4hZFECIAYMi%20FWxamjQ== original text:11008569 encrypted text/cipher: ...
4
votes
2answers
960 views

Secure yet reversible encryption for local data store

I'm working on a piece of software to store and manage records for a youth group. They've found that a lot of the time they spend on record-keeping and admin is taken up by scanning through looking ...
11
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5answers
16k views

Can Skype chat be protected from snooping? Are there safe alternatives?

I use Skype a lot. With all of my clients, staff, contractors and friends, however, the acquisition by Microsoft worries me, as two of my clients are direct MS competitors, and I often work on long ...
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2answers
1k views

How to increase VoIP call security?

I am using VoIP for my office because I can use the same number whether I am in USA or anywhere else. I am using it on my laptop and I have to visit India in the next few days. My friends say rules ...
2
votes
1answer
291 views

User Authentication API

I'm developing a web API for a user database that will be used to verify a given username / password combination is valid. I'm just looking for comments / criticism on the following method that I'm ...
5
votes
3answers
306 views

Encrypt then checksum or vice versa?

This is probably a naive question, but here goes: What is better for security over TCP/IP? Encrypting the payload and then adding a checksum? Checksuming the payload and then encrypting it? ...
3
votes
3answers
225 views

Avoiding direct object references

Say I wanted to avoid exposing a database primary key in a URL; somehow I must encrypt the key, so that the url only exposes elements of an unenumerable cipherspace. What kind of encryption should I ...
4
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3answers
306 views

What SSL options should not be used?

What SSL options should be avoided, due to recently discovered weaknesses? This might include symmetric algorithms, or MAC functions.
1
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1answer
1k views

Is there a way to encrypt an existing ext4 filesystem with already data on it? [duplicate]

I have a big drive with already data on it, that I would like to encrypt (ext4). Is there a way to encrypt that disk without having to move the data to another drive first? Or maybe, this would be ...
2
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1answer
349 views

Does ciphersuite ECDH / ECDHE need hardware acceleration

I have started to read more about ECDH/ECDHE and am wondering if it has the similary issues as RSA - i.e. the processing power required for the decryption of private key is more than of the public ...
1
vote
1answer
331 views

I need a good cryptography algorithm that can be encoded and decoded

I have realized some time ago that we should not put the login/password for accessing a remote database server directly into a executable file because of the reverse engineering and memory decoding. I ...
7
votes
1answer
291 views

Encrypting short identifiers?

I am developing a webapp that does not reveal record count, because it hides the primary key. I am looking for a better way to do this. My favorite idea is to encrypt the ID itself with a block ...
2
votes
2answers
599 views

Looking for general guidance on securing web API application for client applications and users

I have a web service built with WebAPI that accepts JSON requests and responds accordingly. The core architecture is built but there isn't any authentication/authorization. After a lot of googling ...
7
votes
3answers
5k views

Strong encryption for base64 encoded public key in Android

I want to know how I can achieve strong encryption of a public key present in my Android application. It's Android's advice that To keep your public key safe from malicious users and hackers, do ...
2
votes
1answer
359 views

isaac random number generator and the type of encryption it is used for (game packet encryption)?

I recently found isaac but I'm not sure what type of encryption is possible using it. Does the random number generator itself become the message somehow or does it get used as a seed for an encryption ...
4
votes
4answers
3k views

Why do you need message authentication in addition to encryption?

I've been reading up on Authenticated Encryption with Associated Data. The linked RFC states: Authenticated encryption is a form of encryption that, in addition to providing confidentiality ...
3
votes
2answers
255 views

Sharing encrypted data

I have a web app that is storing information related to a organization that I would like to encrypt but share amongst organization members. I would only like the members of the organization to be able ...
3
votes
1answer
2k views

Secure erase iOS devices

All iOS devices from the iPhone 3GS have a hardware encryption chip, right? When you erase an iOS device with the "Erase All Content and Settings" menu item or via Remote Wipe the encryption keys are ...