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 does Bitlocker only-PIN method work?

Microsoft explained USB-key and TPM based BitLocker decryption process on this article. USB-Key process: The steps in the illustrated sequence are as follows: 1- The operating system starts ...
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2answers
190 views

iMac Keylogger and other hacks [closed]

I have someone hacking my computer, this person lives in my home. I know I have a keylogger and a few other things that are making my computer vulnerable etc. My question is: how do I get rid of the ...
12
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6answers
13k views

How secure is NTFS encryption?

How secure is the data in a encrypted NTFS folder on Windows (XP, 7)? (The encryption option under file|folder -> properties -> advanced -> encrypt.) If the user uses a decent password, can this ...
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1answer
28 views

Mechanisms to prevent error propagation in wireless networks with respect to the avalanche effect [closed]

I was wondering what mechanisms exists that could be used to prevent error propagation in wireless networks and especially with respect to the avalanche effect. I know ARQ and FEC can be used, but ...
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2answers
612 views

What role does clock synchronization play in SSL communcation

We've recently implemented WS Trust security over SSL for our client / server communications. Our application is used by thousands of our customers, spread out all over the world. One of the ...
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1answer
84 views

Encrypting sensitive data in a financial form

I'm currently building a B2B E-Commerce site for a client using WordPress. We sell industrial machinery ranging in the upper $100k-$400k price range. My client would like to have their financing form ...
97
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2answers
56k views

What is the difference between https://google.com and https://encrypted.google.com?

Is it there any difference between the encrypted Google search (at https://encrypted.google.com) and the ordinary HTTPS Google search (at https://google.com)? In terms of security what were the ...
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2answers
172 views

Using different algorithms to slow down GPU password cracking [duplicate]

I have some job related files I have already compressed with 7Z. I have protected each with good 10 character passwords consisting of upper, and lower cases, numbers and special characters. And I ...
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1answer
95 views

What is the impact of RSA key's size on CPU load?

I use ssh connection encrypted and compressed. If I use small RSA keys or very big RSA keys, what is impact on CPU load for compression, for decompression and on bandwidth (encrypted file size) ?
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5answers
102 views

Using Diffie-Hellman to verify SSL Certificate?

I am fairly new to encryption and I need some help. I have a problem that I'm trying to solve. My problem is the following: I have a Web Server and an (iOS) App that that communicate with each ...
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8answers
19k views

Which Instant Messaging services use or allow secure protocols, and what do those protocols cover?

We all know there's a myriad of Instant Messaging (IM) services out there. But, which of these services uses or permits protocols that actually secure your communications? For those that do, what ...
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1answer
78 views

Securing user's data against an attacker that may gain server root

I'm designing a web application that is going to handle very sensitive data, storing it on behalf of its users. A kind of online safe, if you will. A user's secure data should only be visible to her, ...
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1answer
66 views

How is PKI used to encrypt an e-mail for multiple recipients?

My understanding is that when an e-mail is encrypted and sent to a recipient, the recipient's public key is used to encrypt the e-mail, and then only the recipient can decrypt it with their private ...
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3answers
871 views

start point into cryptography and encryption [closed]

Recently I am growing passion for security/encryption/cryptography. I follow some famous people in this domain on twitter and read articles over the web. However, this topic seems deep and every time ...
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1answer
38 views

What security layers of protection are available over XMPP?

I have been working on an application running over XMPP. I would like to know which all popular security layers are available over the XMPP protocol, similar to SSL over http.
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3answers
27k views

Is 7-Zip's AES encryption just as secure as TrueCrypt's version?

The main difference being TrueCrypt creates containers and 7-Zip encrypts the file itself, so file sizes can be guessed. Now let's just talk about the strength and breakability of the encryption. ...
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1answer
48 views

Indexing encrypted data for efficient searching

I have implemented encryption for certain columns in a database. In some cases it may be necessary to search by these columns, either for exact matches or for substrings. At the moment, there is less ...
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1answer
127 views

How secure are encrypted USB sticks really? [closed]

So I have read some articles (this being one https://nakedsecurity.sophos.com/2010/01/05/flash-drive-manufacturers-warn-hackers-decrypt-secure-usb-sticks/) that point out some flaws with certain ...
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1answer
53 views

LUKs Header Backup Security

It seems that one of the weak points in LUKs encryption is that the LUKs header can be a single point of failure if you do not create a backup header for it. My question is: What methods of securing ...
8
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6answers
925 views

Is it useful to protect hashed password with encryption?

Imagine that I am hashing the users' passwords with a random, long enough, salt, using key stretching, and a secure hash. Would it be more secure to finally encrypt the hash with a symmetric key?
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1answer
44 views

Is digested password safer than salted password?

which scheme is the better one in your opinion? I know that both are secure but which is better one? I know that digested passwords are very difficult or even impossible to decrypt. Thanks for your ...
2
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1answer
96 views

Wrapping my head around Protonmail

I've been trying to grasp how Protonmail could work. From what it gather, it works like this: When you signup, you create an account password and a mailbox password. A PGP private/public key pair is ...
5
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1answer
270 views

How is ZixCorp able to provide email encryption without a password?

I am trying to understand how/if an email I received is being encrypted. A financial institution sent me a verifiable email (i.e. not phising) asking me to fill out a pdf form to complete a ...
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1answer
4k views

Android Device Encryption

I am trying to understand when using the default android device encryption in 4.0.4 ICS (AES-CBC 128Bit) how the Key Derivation Function works? That is how is the users decryption passcode transformed ...
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1answer
176 views

DNSSEC signing algorithms

Virtualmin supports a flurry of algorithms for DNSSEC: RSASHA1, RSASHA256, RSAMD5, DSA, DH, HMAC-MD5, NSEC3RSASHA1, NSEC3DSA. If I understand correctly, there's Proof of Concept available for SHA1 ...
3
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1answer
239 views

Prevent BEAST attack without RC4 cipher suites

It is common practice to prevent the BEAST attack using the following ciphers in Apache SSL configuration: SSLCipherSuite RC4-SHA:HIGH:!ADH Unfortunately, RC4 has been found to be flawed and it is ...
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2answers
35 views

encryption using two keys

The use case is analogous to accessing a safe box in a bank. There is a per-user key, unique for each user, either generated by the system or hashed from the user's password. And there is a ...
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5answers
3k views

Pattern to allow multiple persons to decrypt a document, without sharing the encryption key?

Current setup We have a service that allows users to upload documents through a website and stores the uploaded documents encrypted on disk. The documents on disk are encrypted with a per-user key, ...
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1answer
49 views

Bridge mode question [closed]

İ have an outdoor in my shop and distributing my network to customers using mac filtering opition.. one of my neighboor got a weak signal....so, he bought a wirelss repeater to recieve a better ...
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2answers
101 views

Are there any good tools to test the encryption quality of data?

I am trying to increase my understanding of data encryption, and I was wondering this. It would be really nice if there were any good tools to test how secure my encrypted data is, for example how ...
2
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1answer
80 views

Any ways to protect my user data on company computers?

I have a desktop computer at work running Windows 8.1 Pro. For logging in I use a domain account and I have logged in with my Microsoft account to get access to my Onedrive and syncing of email ...
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0answers
19 views

Security in MPI implementations

I came across a research paper andproject discussing about the implementation of encryption/decryption in the channel layer of MPICH2 called the ES-MPICH2 library ...
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2answers
99 views

PCI Compliance - Encrypted Mobile Apps

My company (health care) went through a PCI audit and needs to solve some major issues. Our branches collect CHD on paper and saves them to a network drive as a pdf that our corp office accesses to ...
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2answers
693 views

Can the IV + Salt be the same?

During my encryption app i've got the password creation bit: PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, keyLength); and later on the actual encryption part: ...
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1answer
120 views

Client Hello message suggests cipher suite which is not in the list specified by setEnabledCipherSuites() method

In my code, I use JSSE6 API to specify a list of enabled cipher suites. I aimed to only allow 168 bits or higher encryption cipher suites, below is a part of my code: /** List of 168 bits encryption ...
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1answer
108 views

Why is not safe to use the same public key in RSA?

In the RSA context, why is not safe to use the same n (public key)for different people?
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1answer
2k views

ECDHE_RSA and gmail

I'm using Chrome on Ubuntu Linux to connect to Gmail. The connection info says that ECDHE_RSA is used for the https symmetric key exchange. Based on my understanding of TLS and Gmail, my client ...
12
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4answers
6k views

Is it generally a bad idea to encrypt database fields?

I work on a tiny company, it's literally me (the programmer) and the owner. The owner has asked me to encrypt several fields in a database to protect the customers data. This is a web application that ...
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5answers
6k views

SQL field level encryption, how safe is it?

I am considering encrypting my database and/or encrypting only certain columns in a few tables. Is it worth the time? I mean, how much of a burden would it be on someone if they were to get a hold of ...
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1answer
67 views

How to cryptoanalyze a one time pad that uses a plain text document as the pad?

I have read that in order for a one time pad to be truly secure, the pad itself must be random data. Given the practical difficulty of sharing a secure random pad, I was wondering what would be the ...
2
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1answer
49 views

ecryptfs - relationship between passphrase and sig-cache.txt

I have previously used TrueCrypt for creating encrypted directories on servers. I am now trying ecryptfs due to the end of development announcement in May. I see that when I encrypt a directory and ...
1
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1answer
126 views

Chat encryption system avoiding protocol sniffing and then key+decryption replay?

I'm working on a chat system and I want to add it some kind of security (not just HTTPS with SSL since I've read it can be sniffed and decrypted with a few tools). Now, my knowledge in cryptography is ...
2
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2answers
83 views

Encrypted container on top of a copy-on-write filesystem

The way I understand it, when you write to a copy-on-write filesystem, data never gets overwritten in place, instead new data is written to a new location, and the old data will only be overwritten ...
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2answers
341 views

Difference Between MD4 and MD5 encryption

During coding, I have used both MD4 and MD5 encryption techniques. But there hasn't been any noticeable security difference between either of them. And yet, most of them prefer MD5, in fact specify ...
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1answer
84 views

Encryption and HMAC with the same password

I need to send authenticated ciphered messages by using a single password. Reusing the same (derived) key for the block cipher and the HMAC is not a good practice, I know. My initial idea is to ...
3
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1answer
143 views

Using Facebook via Tor

I think about using Tor for nearly everthing, including Facebook, because FB often tags the users even on other sites, for example per Like-Button, Cookies etc. Now I think about using the Tor ...
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2answers
115 views

Is using TrueCrypt in OSX secure? [duplicate]

What would be a more secure way to encrypt files using TrueCrypt 7.1a. The is an airgapped computer (wifi, bluetooth, speakers and mic removed too). The encrypted files will be on an external drive in ...
0
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2answers
87 views

Should I use HMAC in this situation

I need to store a big message encrypted on a server. What I am about to do is: Encrypt the message with a AES key; (Authentication) Hash the message with SHA512 and encrypt the hash with RSA priv ...
3
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1answer
85 views

How to best to secure data over HTTPS

My aim is to have an (iOS) app in which the user would login, then on sucsessful login, gain access to additional information over an encrypted webservice (undecided). From research, I understanding ...
3
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1answer
105 views

Is it a good idea to do double AES encryption with 2 different keys, when one is held by the user and one stored on the server?

I'm building a web app. The app needs to keep certain data within the database very secure. Please assume for the moment that I don't have a HSM or Key-Management facility and can't afford to ...