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 it possible to create multiple hidden volumes within an encrypted volume?

You can create an encrypted hidden volume from an outer encrypted volume within Truecrypt or it's fork, Veracrypt... but is it possible to create more than one hidden volume within an outer encrypted ...
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1answer
43 views

Should I make my api calls to update users contain a password or hashed auth key?

So Im creating an API for an app that in the backend involves updating users, deleting users, and some other user related stuff. Im using the slim framework and I was wondering when the user wants to ...
0
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0answers
49 views

PHP crypted or hashed string to decode

I have a problem for captcha solve in 3 days. This is crypted or hashed captcha cookie 55debbcf069c81440660431 23 characters long. I found last 10 character is 1440660431 timestamp. I think first 13 ...
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2answers
3k views

Protect access to an SD card

How can I protect access to an SD card, so that only authorized users can read or modify the content of the SD card. Currently everybody who has physical access to the SD card can read or modify ...
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1answer
98 views

Default Encryption - A Panacea or Placebo

I wrote this on LinkedIn - Discrete Discretion My first question is: Is it accurate to say that default encryption is a placebo? Will default encryption only make end-users think they are secure ...
3
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1answer
71 views

Exchange encrypted messages on public chatroom

Not so long ago, I was chatting with a friend on our university's accounts, and the discussion went to an interesting subject: what if the administrators have access to our messages? So we had the ...
7
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5answers
5k views

If I send a fax from an unsecure endpoint to a secure endpoint, is the data secure?

I am very technical, but I do not know much about fax. I was told to send a fax to somebody with some very private information, and not to worry because they had a secure fax line. That's all well ...
4
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2answers
80 views

Is encryption possible for simplex (one-directional) TCP/IP, and if so, how?

As explained in the TCP/IP Guide, it is possible to configure TCP/IP to operate in simplex mode and this mode is utilized, among other things, in communication from satellites. One consideration with ...
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1answer
75 views

“If encryption has not been implemented, a comparable alternative has been implemented” [on hold]

What constitutes as a comparable alternative to encryption? I know that password keepers and other services are not comparable and are not considered encryption. If the context is authorized access ...
0
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1answer
38 views

Locking down Amazon RDS table data

We are using MySQL Amazon RDS. The instance is encrypted, and also only available via SSH from the production server EC2 instance. One of the things we are trying to do is give access to some ...
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1answer
71 views

What will happen to decrypt a tampered message encrypted by a symmetric key

There is a message M, it's encrypted by a symmetric key like Y=E(K,M). The message is sent to B from A. During the transportation of message M, if the message is tampered by C, then when B received ...
5
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3answers
1k views

Digital Signature and Verification?

AFAIK , When Alice wants to write a message to Bob -- she uses Bob's public key and encrypt the message - and then Bob - using his private key - use to decrypt it. So public key is used to decrypt ...
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1answer
24 views

Envelope Encryption with asymmetric keys vs KMS

In Envelope encryption a symmetric secret key is used to sign the data and then another key is used to encrypt the secret to produce an encrypted secret key. The encrypted messages is packaged with ...
5
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2answers
2k views

Android support for TLS 1.1

Do anybody know from what version of Android did TLS 1.1 started to be supported directly by the OpenSSL version preinstalled in the system?
5
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4answers
35k views

How safe is the 256-bit encryption used in bank transactions?

Most of the banks use a 128-bit or 256-bit encryption. What does this mean? Does it mean that the keys used in SSL are 128-bit long or what? If they are the SSL key lengths then 128 bit RSA keys are ...
2
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1answer
79 views

GPG: Can't encrypt DSA 3072 keys

I would like to ask this question as I'm not the first person which has this behavior. I'm trying to encrypt a simple message using GnuPG using a public key I've received from a friend, he's using ...
3
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1answer
121 views

Writing your own John the Ripper module

I have a script in C, which is able to determine the password of certain data. It uses HMAC and RC4 algorithms to encrypt the given password and then compares that later to the given data. If they ...
0
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3answers
202 views

Is there any way to securely hide data on physical media?

In the recent years I've gotten more paranoid of spying and hacking, so I've encrypted most of my important files just in case. Tax information, some company confidential information, account logins, ...
6
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1answer
89 views

Is there any reason to use AesManaged over DPAPI in this scenario?

I have a situation where my web application is going to be deployed on multiple web servers, and I'll be wanting to store some securely encrypted data on the DB servers (each web server has a DB ...
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2answers
66 views

Are ServerHello, ClientHello, ServerKeyExchange messages encrypted

In process of SSL handshake, several message like ServerHello, ClientHello, ServerKeyExchange messages are exchange before the actual encryption starts. Are these messages encrypted? If not then ...
3
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1answer
221 views

Session Management for Private Key Passphrases in a Web Application

Use Case I would like to encrypt data in a database for a Web Application. The following requirements exist: Decryption should only be possible when a user provides a passphrase Encryption should ...
3
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1answer
287 views

Klein and PTW wep attack

I'm working on an implementation of Klein's wep attack. For that, I've set up a router with wep encryption and collected 50,000 unique IVs from it. I tried only calculating K[0], meaning - the first ...
0
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1answer
56 views

Impact of sharing the private key with a third party for snooping SSL traffic

I am trying to understand the impact of sharing the private key with a third party for snooping SSL traffic. Below are my thoughts, please correct and add if some more impacts are there: One clear ...
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1answer
62 views

How to sell a new idea – “100% secure communication”, feedback wanted [on hold]

I have thought of an idea (new product) to have 100% secure communication between 2 parties and would like your feedback/ideas on how to sell it. Oh, before you start that there is no such thing as ...
5
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1answer
3k 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 ...
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2answers
72 views

Building an anonymous network

Imagine you're building Facebook, except you don't want to reveal user identity for posts and comments. You still want to verify each user's organization. For example, if the user signs up with ...
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2answers
68 views

Saving Authentication Tokens to Third-Party Websites

So Flickr allows you to authenticate users to your app via app_key and secret and returns an authentication token. I want to securely save that authentication token in my database, but also be able to ...
2
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1answer
74 views

Communicate through gpg

I need to frequently communicate with a server in the manner do stuff related to x or send me info of x My thoughts are to directly put the task I want to be executed into the package I want to send, ...
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2answers
175 views

Why do I have to use multiple keys for each direction and purpose?

I'm currently writing an examen about 'Lessons Learned in the IT-Security'. I already found some thing, which shouldn't be done. But right now I'm in trouble finding the reasons why not to do so. ...
2
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1answer
63 views

OpenVPN username and password authentication only - unsafe?

Is it safe to only use username and password (and server certificate) for OpenVPN connection authentication? Are username or password ever transmitted in plaintext to the OpenVPN server? I found a ...
3
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1answer
129 views

Are there any passwords managers that use a second hidden encryption drive to hide passwords?

I've heard that encyption program, Truecrypt can create a hidden encrypted drive within an encrypted drive; and even if an attacker accesses the first encrypted drive he/she cannot prove the hidden ...
3
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1answer
152 views

SIP Provider stores credentials, is it required for some SIP phones?

My SIP provider stores my SIP call time password as AES encrypted in stead of hashed. I understand that SIP authentication has the capability to NOT store the password, and in stead store a ...
1
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1answer
221 views

Storing encrypted data for offline use

A user downloads a file from a server. I want to store that file locally on the user's machine so they can view offline. For protection, it should be encrypted while not being viewed. My theory is ...
11
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1answer
964 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 ...
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0answers
26 views

Any idea what type of encryption this is? [duplicate]

I can't seem to find out what this is, I am a newbie at this stuff. 81n5q574po4p977srqo89960000sp14n
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0answers
38 views

Why isn't a table used to solve the large number factoring problem? [migrated]

Lots of modern encryption (RSA comes to mind) are based on the fact that factoring large numbers is hard. However, multiplying large numbers is much easier, and table lookups are very easy. Since ...
11
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3answers
11k views

What is the DUKPT Key Derivation Function?

I'm tasked with decrypting ciphertext acquired from an encrypted card reader. The card reader utilizes DUKPT(derived unique key per transaction) scheme and 3DES encryption. I don't have a problem with ...
5
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2answers
715 views

Are temporary files an issue when opening and editing an encrypted 7z file?

I am new to security and encryption. I want to store important information like passwords and pin codes so I don't forget them. So far I have been using LastPass but I would prefer a solution I ...
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1answer
61 views

Determining whether a local area network is encrypting information in transit

My computer is connected to a switch. Numerous other network devices are also connected to the (local) switch. Is there a simple way of determining whether the connection between my desktop and ...
2
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2answers
161 views

Is it possible to encode some data in a image and decode the data from hard copy?

I am working on a project which can encode some data in an Image and share it with other people by printing it out as hard copy. Now, other people can take a picture of the hard copy they got and ...
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1answer
87 views

How would I encrypt something like this; [closed]

I want to encrypt some very important passwords in a text document or something like it. What would I use to ensure maximum security.
3
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41 views

GPG subkey layout. Separate keys for C, S and E?

I've been reading up a lot on GPG recently. This page describes how to setup so-called "laptop keys". The idea being that if you lose your laptop, or have it stolen, your primary certification key, ...
0
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0answers
26 views

Triple-DES DUKPT CBC PIN variant vs Data variant

Does any know the difference between triple des dukpt decryption algorithm with PIN variant and Data variant? I have done Triple DES DUKPT PIN variant, which generate session key from KSN and BDK. ...
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votes
1answer
40 views

How to find an encryption algorithm between two hexadecimal numbers? [closed]

I have several numbers that are generated by a server. They are 16 digits long and are hexadecimal. I have no idea whether or not any salting or hashing techniques were used. Can I find the encryption ...
0
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2answers
71 views

Encryption in case of distributed architecture

I have application infrastructure as follows - web client -> load balancer -> Apache (web server) -> Weblogic (application server). I could understand that in case of HTTPS request, SSL handshake ...
84
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11answers
20k views

Is there any technical security reason not to buy the cheapest SSL certificate you can find?

While shopping for a basic SSL cert for my blog, I found that many of the more well-known Certificate Authorities have an entry-level certificate (with less stringent validation of the purchaser's ...
0
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0answers
34 views

Performances of dm-crypt vs. ecryptfs

The only information I found about the difference of performance between dm-crypt (LUKS mode) and ecryptfs is that given that ecryptfs operates at filesystem-level, it may be slower when doing ...
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0answers
44 views

How to ensure message integrity for ciphers created via RSA algorithm [migrated]

In order to send a message over an unsecured channel I have to first encrypt the data using the RSA algorithm. The implementation I use is the javax.crypto.Cipher in Java 7. I'm aware of chosen ...
249
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13answers
29k views

How is it possible that people observing an HTTPS connection being established wouldn't know how to decrypt it?

I've often heard it said that if you're logging in to a website - a bank, GMail, whatever - via HTTPS, that the information you transmit is safe from snooping by 3rd parties. I've always been a little ...
4
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2answers
1k views

Why is ECC more vulnerable than RSA in a post-quantum world?

Forgive me if this should be in the crypto sub, but sometimes the answers there are very mathematical and I would rather have an answer which is a bit lighter on the math but still strong on the tech ...