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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Secure connection between two clients with shared secret

I am creating a system where there are multiple clients, each of which has a secure connection to a central server which could pass out shared secrets to each of them. I could be wrong, but I am ...
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17 views

Can't encrypt email

My friend has a problem described here: https://gpgtools.tenderapp.com/discussions/problems/18790-cannot-encrypt-an-email But the solution provided by this link did not work. What else can he try? ...
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3answers
4k views

Tool or Process to check for AES-NI support on processor?

In another question, Thomas' answer mentioned the AES-NI instruction set, which piqued my curiosity. Is there a tool or process available out there to check whether the instruction set is available ...
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1answer
43 views

Cloud-based IM protocols / services saving messages encrypted on server which is decryptable only by user?

I am looking for a cloud-based (i.e. not end-to-end) secure IM protocol or service. The first one comes to my mind is telegram. Here is a quote from telegram's privacy policy: Cloud Chats ...
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1answer
120 views

Any way to revoke old key pair?

There is a many-year-old 1024 DSA key in the public keyservers under my name. There is a 2048 ELG-E subkey for it. I didn't create these keys, they were created for me by a former employer without my ...
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1answer
70 views

UEFI and security implications for encryption

After my old PC kicked the bucket I now own my first UEFI board and I am already having trust issues. I utilized Truecrypt's system encryption for years now and really got used to it. My new board has ...
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2answers
353 views

ProtonMail security concerns

This TED talk brought me here. First of all, to those who created ProtonMail: Nice job!!. Regardless of what people say, it's definitely a big step forward from tradition options like Hotmail, Gmail ...
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1answer
41 views

VPN and authorization [on hold]

I wonder, if one should implement two factor authorization and encryption in a client-server solution, how is it done? Of course there can be many ways but some examples would be great. I imagine the ...
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2answers
390 views

No HTTPS on credit card entry form - can it be safe?

I was going to make a purchase on a website, but the page containing the credit card entry form is served via HTTP and not HTTPS. Is it definitely unsafe? The website advertises the use of ...
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1answer
23 views

Is it possible to assign different UIDs to subkeys for the purpose of having multiple identities?

Many people advocate generating new primary keys for each identity they wish to have. For example, creating one primary key and associated subkeys for workplace use, and a completely different ...
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321 views

Which default encryption does OpenSSL use?

If I create a private key via: openssl req -x509 -newkey rsa:2048 -out cert.crt then OpenSSL writes the private key to the file privkey.pem and if you do not provide the -nodes parameter it will ...
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1answer
43 views

How to securely derive a second password specific to an user

I'm giving each of my users an unique Blocktrail wallet that is protected by two API keys (which the server knows) and one passphrase (unique to each wallet). I want the wallet's passphrase to be ...
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1answer
23 views

Machine readable, user non-readable - XML file

I need some advice as I have been unable to find anything useful via the web - (Google search). I have used the application EventGhost so as to create a custom shell, that I run using the Windows 7 ...
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3answers
36k 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. ...
4
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4answers
9k views

Is diskcryptor really secure?

Diskcryptor is an open-source competitor to TrueCrypt for Windows. It has an edge over Truecrypt for system encryption, because it allows for more than one independently encrypted system partition, ...
5
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2answers
142 views

How to securely store application data on mobile device

How can security be enhanced to the maximum in a messaging app storing messaging history on the device (like whatsapp)? I am specifically referring to methods to minimize the risk of the data being ...
2
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1answer
38 views

Can you use ssh for secure inter app communication on the same device?

I use ssh to get an encrypted connection between servers and local machines all the time. It's fast, it's secure, and there's a way to do it in nearly every system programming language that I've used ...
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0answers
21 views

Create Incremental/complete backups from a disk encrypted using TrueCrypt? [migrated]

I have a tricky question about whole disk encryption and its backups particularly TrueCrypt for which I have never found a great answer What method do you recommend/use for create automatic backups ...
0
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1answer
21 views

Evaluating encryption/promised anonymity of message service [on hold]

This is a question that in my opinion should be able to be generally answered, and not just discussed. I therefore hope some discussion will lead up to a straight answer. Scenario: A website X ...
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1answer
49 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 ...
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0answers
26 views

i need guidence please help me [closed]

I would like to create an app which connects two persons through internet and the conversation should be secured by an unique style.can someone please help me on this.
1
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1answer
69 views

How to determine if mail was encrypted during transport using the header information?

First things first: I know about the difference between end-to-end-encryption and transport encryption. Back to topic: I already read some things about how mail server handle transport encryption, ...
2
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2answers
198 views

My Virgin Media account password is visible in plaintext to call center staff. What do I do?

Whilst on the phone to support staff (about billing) to Virgin Media, perhaps the largest ISP and telecoms company in the UK, I was asked to confirm my password over the phone. I asked the advisor ...
3
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1answer
191 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
257 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 ...
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1answer
75 views

Check HMAC after completing decryption or before?

I have written a piece of software that symmetrically encrypts big files (multi-megabyte). Plaintext is encrypted, after the encryption the HMAC is calculated and written into the header of the file. ...
3
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1answer
93 views

RC4 encryption of torrents safely

Torrent clients offer encryption of traffic using RC4, and people consider this very safe to hide traffic information from ISP. Now since I have a website with SSL encryption, I know that RC4 has a ...
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2answers
149 views

Is there a way to securely store unsalted passwords?

So, obviously I'm not talking about username/password pairs here, I plan to store passwords with two salts and three hashes, but what occurred to me is that if I had a table where I kept pairs: ...
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3answers
346 views

How can I secure the secret key?

I am a bit confused about securing the secret encyption key. Here is the scenario: I need to encrypt some data (file) This data will be read by a program (say written in C/C++). Both the program ...
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0answers
27 views

Security implications of providing an encryption/decryption oracle

I need to provide a service that acts as a symetric encryption/decryption blackbox : the box get a secret key k users send datas d, and get ciphertext c = Encrypt(d,k) users send ciphertext c, and ...
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1answer
98 views

What encryption is used in this email? [closed]

bobnick1998sw@yopmail.com 96Xx7Tfrf+2zLvKiSXLAoY+W4dh6h+r4ML3JlmXrkyQ= bobnick1998sw1@gmail.com 888IK6Jz5tLP11RcEfWB/CcSbq4x7FIX2BtRi15o7dc= Here are the emails and the encrypted emails, now can ...
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0answers
17 views

SSLException: Unsupported record version Unknown-84.84 [migrated]

I'm facing a weird issue on our server that happens intermittently not quite often (once a month) and can't figure it out. I've searched for this and found this thread which is pretty similar to my ...
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1answer
26 views

Getting multiple key matches on plaintext/ciphertext pairs in double DES

I'm trying to implement a Meet-in-the-Middle attack and just to test it out I've done some hardcoding of values, which is simply this block of simple code: byte[] key1 = new byte[] { 0x20, 0x00, ...
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31 views

Is there a solution for On-the-fly-encryption with active directory rules & policies?

I am looking at having our servers' sql databases for a few program and documents to be always encrypted on the HDD, but available to AD users. So one or multiple users with the right AD privileges ...
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0answers
32 views

How to mount a truecrypt container with noatime? [migrated]

I'm using the TrueCrypt GUI on Ubuntu and I don't think there's an option for specifying mount options in the interface. I want to use noatime, because it reduces writes to the disc. I have seen the ...
2
votes
1answer
63 views

How to send an encrypted mail only knowing the PGP fingerprint?

How does one send an encrypted email with PGP, when he only has the recipient's fingerprint? I am already sending emails using PGP, but I've just pulled a contact's PGP fingerprint who I need to ...
0
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2answers
134 views

Is it safe to auto-fill credit card numbers using Chrome?

Is it safe to auto fill credit card numbers using Chrome? Does it safely store the credit card information? As far as my understanding goes, it just shows asterisk values but on click it reveals the ...
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0answers
46 views

Truecrypt system encryption in legacy mode and UEFI [migrated]

I just recently got my first UEFI board and installed Windows 7 in legacy mode. This new system is encrypted with Truecrypt's system encryption feature but UEFI kind of startles me anyway. First of ...
1
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1answer
151 views

Hidden OS: Decoy OS ≠ Hidden OS?

I wanted to use two different OS then two OS equal in the distinct functions: Hidden OS: Linux Decoy OS: Windows Has how? because what I have read until today were processes done with even OS, I do ...
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2answers
137 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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0answers
60 views

Is it possible to do Public Private Key Encryption on a chip (hardware)?

Does a chip exist which will take input data and output encrypted data in a public private key scheme, where the public key is on the chip and the private key is located remotely? The ultimate goal ...
3
votes
1answer
230 views

Hashcat, finding out the Hash [closed]

I've been searching but I can't seem to find the much information on how to extract hash's from say PDF files or Lotus Notes files that I can then use in Hashcat? I know how to get them for Office ...
2
votes
1answer
104 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 ...
0
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1answer
86 views

Is it secure to not expire keys in symmetric encryption?

Note that this question describe hypothetical case, that is never meant to be used in real world. Server communicates with clients with message structure: client_id, initialization_vector, encrypted ...
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2answers
40 views

AES algorithm encryption time

What is the time taken by an AES Encryption algorithm, with a key of 128 bits, operating on a normal computer (say with Intel i7) and what will be the impact be on the time if I wish to use a 256 bit ...
0
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1answer
176 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 ...
3
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2answers
263 views

IPhone iOS 8.3 encryption security against physical access

Excerpt from Apple's Whitepaper "iOS Security" on Effaceable Storage: A dedicated area of NAND storage, used to store cryptographic keys, that can be addressed directly and wiped securely. ...
3
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3answers
5k views

Chrome showing cryptography as 'obsolete'

Similar to this question, Chrome is showing the connection cryptography as obsolete. Opera, IE and Firefox seem perfectly fine with the connection. My guess would be the message authentication is ...
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0answers
20 views

2DES vs. two-key triple encryption, with no decryption step [migrated]

So studying double encryption (double DES) and understanding why it is subject to a Meet-in-the-middle attack, I tried to see if the same attack could be applied to a triple encryption with only two ...
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1answer
31 views

CryptoAPI to CommonCrypto with RC4

I have cryptographic code used in the Windows platform, which uses the Crypto API functions and need to convert this to using Common Crypto on OS X. Essentially the original code is this, with error ...