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 is the username and password captured on this mobile device?

I have a Motorola phone, and I am concerned about my privacy after reading this article : http://www.beneaththewaves.net/Projects/Motorola_Is_Listening.html The poster says: For both of these ...
3
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2answers
50 views

Consequences of putting a serial number into an AES key

I have an embedded device with a secure memory of only 128 bits. I have to store the serial number (16 bits) and the AES key (128 bits) into this space. What are the consequences of putting the 16 ...
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0answers
19 views

How do TSC (TKIP sequence counter) calculate into WPA?

I'm reading about 802.11, from IEEE's pdf (IEE pdf), from page 1191, and in particularly I'm reading about TKIP. And to decrypt and to encrypt used a TSC (TKIP Sequence Counter) as you can see in ...
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1answer
49 views

Can a mobile phone be induced to fall back to 2G comms?

http://techcrunch.com/2015/02/25/gemalto-2/ So, a bunch of SIM card keys were most likely stolen, but Gemalto claims that this would only affect 2G networks. Supposing all that is true, it's still ...
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0answers
18 views

computer security [duplicate]

Assume that user A is about to use some website that requires login credentials. User A starts his web browser, types the website’s URL, and submits the URL request. The web server hosting the ...
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3answers
100 views

Maintaining data security in motion with SSL

I am hosting with a HIPAA compliant hosting company, as we are required to do because of the industry I am in. We have a BAA executed with them, and their responsibility terminates at the application ...
5
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2answers
106 views

Files encryption for flash drive privacy/security

Looking to encrypt files on flash drive (for backup) just in case it gets stolen or lost. Don't want to install any extra software like TrueCrypt but instead just use what's already on most computers. ...
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1answer
41 views

Search Engine security for searches associated with the same searcher [closed]

A number of years ago AOL leaked potentially identifiable information, because all of the searches leaked were associated with the same 'user', and as such they could be put together to identify the ...
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2answers
90 views

Is it a secure encoder and hasher?

I want to ask if my code secure or not. if this is not secure please tell me the reason. This code is mixed of Rjindael-256, base64_encode and SHA-512. function xencoder($input,$key) { $salt = ...
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1answer
56 views

PKI/Why does Microsoft require my cert before encrypting an email?

Microsoft doesn't allow sending public-key encrypted messages using Outlook 2003-2012 on Windows 7-8x environments without first creating your own Digital ID or private key for signing. Per ...
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0answers
62 views

Can I use the output from a DRBG directly as K for AES, or do I need to use a key generator algorithm? [migrated]

NIST has 3 validated "Recommendation for Random Number Generation Using Deterministic Random Bit Generators" (DRBG's) that are based on NIST SP 800-90A: Hash_DRBG (based on hash functions) ...
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0answers
95 views

Linux Plausibly Deniable File System

Is there any way to encrypt a linux filesystem in such a way to maintain plausible deniability? E.g. "Hidden OS support," the way Truecrypt and Veracrypt work, they only support Windows OS due to low ...
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2answers
124 views

How can an attacker identify the encryption method with only ciphertext?

Assume that attacker only could obtain ciphertext, but knows that method is symmetric. Is there a way to find which algorithm was used for the encrytion? And in general, if attacker knows the ...
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1answer
43 views

Encoding Same Message with Different IV (AES/CBC)

Let's say I encrypt a message using AES/CBC twice, with the same key but two different IVs. Is this safe? Or can the resulting ciphertexts be used against each other to obtain information about the ...
6
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1answer
508 views

can multiple encryption of data with multiple keys increase the security?

I mean: does encrypting data multiple times have an effect on diffusion and confusion? Does it increase security, or does it have no effect? Is it useless? Does it make it harder to break the secret, ...
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3answers
101 views

Prevent MITM between custom phone app and local server

We're building a Wifi enabled device. The device will be installed locally on each client's office and people in the the small office will connect to this Wifi enabled device, They will send/receive ...
5
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1answer
97 views

Showing bank routing/account numbers, and storing them safely

EDIT: This is for the UK/Europe region. I've been scratching my head reading other posts similar to this one about safely storing bank routing and account numbers. I know that routing numbers can be ...
4
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2answers
180 views

Why does the first call to DecryptUpdate in AES-CBC return 16 fewer bytes?

While decrypting a file by CBC mode of AES algorithm, the output length is 16 bytes lesser than that of the input length. For example if you pass a buffer of 512 bytes it decrypts 496 bytes. It ...
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1answer
78 views

Storing encryption key in a cookie?

I have a website issue that I am addressing by storing an encryption key in a cookie. I want to describe my issue and my solution, and see if someone smarter about such things than I thinks this is a ...
1
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1answer
68 views

Android email encryption [closed]

Is there a reliable (in terms of security), open-source application for handling (send/receive + en-/decrypt) encrypted emails on Android? Something like TextSecure for emails. I just found a command ...
0
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3answers
107 views

Please critique my encryption scheme for a very small microcontroller [closed]

I am new here and not an cryptography expert; but I have been using encryption library for a while. My company is working on a small hardware device. It is powered by a microcontroller so memory is an ...
19
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3answers
2k views

Why do HTTPS requests include the host name in clear text?

I'm having a little bit of trouble understanding why the HTTPS protocol includes the host name in plain text. I have read that the host name and IP addresses of an HTTPS packet are not encrypted. Why ...
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1answer
65 views

How to pick an encryption algorithm (cipher) and mode for PHP's mcrypt, for encrypting passwords?

There are numerous algorithms listed in the PHP documentation: http://php.net/manual/en/mcrypt.ciphers.php How strong is each one and what criteria to use when picking one? Also the ...
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1answer
146 views

Possible shellcode mailed to me

When I opened my email this morning I found a rather odd message in my mail box. It didn't seem like your every day spam email as it looked like a base64 encoded string and nothing else. Here is a ...
0
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1answer
75 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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8answers
7k views

Why can't you work backwards with public key to decrypt a message?

As the title suggests, I am curious to know why you can't work backwards using a message, public key and encrypted message to work out how to decrypt the message! I don't understand how a message can ...
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1answer
38 views

What are the risks of file server access over wireless? [closed]

In our office, all computers connect to the network over wireless. The wireless is protected by a pass phrase and communication is AES encrypted. On the same network is a file server that is used ...
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2answers
47 views

Secure encrypted storage of values that allows DB lookups?

I'm developing a system that has to store Finnish national identification numbers as securely as possible while allowing "does this identification number exist in the system?"-type queries over a web ...
21
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5answers
3k views

Is it possible to “read” secure (using SSL or TLS) messages if you know the message?

If I am communicating over a secure line (secured using SSL or TLS) and I send the server a message. Could someone eavesdropping tell what that message was if they knew before hand a list of messages ...
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1answer
48 views

What would be a problem with using a block cipher to encrypt the traffic of an online game?

I have a question and can't really find the answer. Here are my 3 possibilities. I think it is the 2nd one but want a different opinion. a)The communications require a key exchange not supported by ...
2
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1answer
86 views

How does this encrypted webmails works?

In the last days I was looking on Tutanota, ProtonMail, LavaBoom, and others webmails that promise to respect users privacy. For all those, the one I most liked was Tutanota. I did few tests with ...
3
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1answer
137 views

Secure Connection between two mobile (Android and/or iOS) devices

I've a Device A which will communicate with multiple devices on a network (BLE and/or NFC). All the devices will be handled a Token upon authentication which somehow needs to be transferred over to ...
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3answers
168 views

If TLS 1.2 is considered unbreakable, why do the NSA and other agencies invest in supercomputers? [closed]

If a 2048-bit RSA key and a 256-bit AES key are considered to be unbreakable within the foreseeable future by any kind of computer, why do the NSA and other intelligence agencies invest in ...
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1answer
64 views

How to send secure messages from a microcontroller circuit?

I have an Arduino with a GSM shield. This enables me to send short arbitrary messages to any server. What do I need to do to enable sending "secure" messages (that cannot be intercepted and have a ...
0
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2answers
137 views

Is all encryption compromised? [closed]

Assuming that what I read about the Nazi enigma encryption being broken in ww1 and ww2, where the code breakers hid the fact that they had broken the code, allowing the world to feel that the code was ...
1
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1answer
32 views

Is it possible to convert a gpg key to a different encryption algorithm [duplicate]

Maybe the answer to this question is a simple and unequivocal "No", followed by "How can you possibly think that this is possible?". And if I think about it rationally this seems to be the only ...
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298 views

Linux kernel entropy - does it matter to /dev/urandom and what is a minimum?

This question had been asked several times, but still something's not clearly understood from other answers I have a few servers running with a custom built linux kernel (minimal driver modules etc), ...
2
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1answer
55 views

What is the default cipher algorithm for GnuPG?

I know, that one can force GnuPG to use AES256 for encryption with gpg --cipher-algo AES256 or with a special setting in ~/.gnu/gpg.conf. But, what is the default cypher algorithm for GnuPG, if I ...
2
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1answer
89 views

Plain text password emailed back during registration [duplicate]

I would like to ask if the passwords in the database are not encrypted if during registration I am receiving plain text password with username.
2
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0answers
62 views

How do I allow for anonymous encryption? [closed]

I have a protocol I am designing that requires anonymity and privacy. My idea is to have a minimum number of hops in the network before the message can be sent to its intended destination. The ...
2
votes
1answer
29 views

How is ECIES available in FIPS Validated libraries?

ECIES is Elliptic Curve Integrated Encryption Scheme. Both Certicom's SecurityBuilder and RSA Data Security BSAFE provide ECIES. Both are FIPS 140 validated, and both clearly list ECIES in their data ...
3
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0answers
75 views

How does Silverlight protect the AES keys it gets from PlayReady? [closed]

I'm doing some research about how Silverlight protects AES keys. Here is the scenario: There is a smooth stream live encrypted channel service. When i log in to the service and tune the channel, ...
2
votes
1answer
170 views

linux hidden OS

I have been reading about hidden volume OS with truecrypt, and now with its successor, VeraCrypt. https://veracrypt.codeplex.com/wikipage?title=VeraCrypt%20Hidden%20Operating%20System But Couldn't ...
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3answers
151 views

Is this approach to backups secure?

I've got an existing (personal) backup service which I'm rewriting from the ground up to be secure. At present, I just store files (and diffs) in AWS S3 with no encryption. It works fine but I'd like ...
4
votes
3answers
267 views

Is AES 256 secure enough for putting Backups to AWS or Dropbox?

How long would it take with current hardware to hack an Disk Image which was encrypted with AES 256? I ask because i want to backup personal files (contracts, tax-things, code, keys, private ...
2
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1answer
61 views

Reading encrypted data before sent to remote server

I'm developing a mobile app (Android only for now) to provide a disposable e-mail service to users. Users will be given temporary e-mail addresses so they can receive and read e-mails for a certain ...
1
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1answer
35 views

What is the “segment size” when using Cipher FeedBack (CFB) chaining mode?

When using CFB chaining mode with AES, I see instructions that the "plaintext length (in bytes) must be a multiple of segment_size/8" (also mentioned here). What does that mean?
2
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1answer
27 views

Does any DNS Recursive resolver accept a “DNSSEC-only” option under DNSCurve?

I want to use DNSCurve (for privacy) to a trusted DNSSec resolver (for integrity), and want to ensure that I can tell a recursive resolver (like 8.8.8.8, or OpenDNS) that I only want DNSSec queries. ...
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50 views

Logging in from one CMS to another

Two websites with different CMS, user should type login & password on one website and needs to be logged in second website automatically. Now i have this method, it works but i want to know - is ...
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2answers
114 views

What options exist for authenticated full-disk encryption?

Title says it all really. I'm toying with the idea of storing some disk images in "the cloud", but am concerned about the possibility of an attacker manipulating cipertext to do evil things once it's ...