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 can I determine the encryption used by knowing input and result? [duplicate]

Is it possible to determine the encryption or hash used if I know the original input and final output? There is a similar post here: Determine encoding/hashing methods used based on knowing the input ...
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1answer
79 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
113 views

Auto encrypt chunks of content for backup, best practice?

I'm just curious and it's more like a mind game, I'm not into cryptography. How would one encrypt data that's constantly generated? Put the data automaticly into chunks encrypt the chunk and send it ...
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2answers
1k views

What risks do I have to consider when encrypting server side as opposed to client-side?

I am looking at encrypting user data however performed on the server as opposed as on the client. What risks do I have to consider and if so how do I limit such risks? The reason we are looking at ...
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1answer
114 views

Using multiple hash-functions along the line [duplicate]

I was wondering what the effect on strength/security is If I would use an aggregate of multiple hash-functions. For instance, I don't want to sent passwords in plain text (although it's over an ...
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3answers
142 views

Basic simple encryption with already installed tools

If you are exchanged email messages with people using Linux, Windows and some odd Mac and want to implement some really basic security, encrypting all messages, just trying to avoid some ...
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1answer
110 views

Secure way to encrypt (not hash) passwords?

I'm building a system that for reasons I'll outline below, can't used hashed passwords, but I'd still like to encrypt them so that it's as hard as possible to crack them, in the (unlikely) event the ...
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5answers
731 views

What if I develop my own hash algorithm to create strong passwords from easy ones?

I came up with this idea but I cant figure out if it's good or bad, maybe you can help. My goal is: I want to create extremely strong passwords for my main accounts (gmail, skype and so on). I want 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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4answers
256 views

Creating a secure and encrypted e-mail service

Model People living in countries with totalitarian, oppressive and other threatening regimes should be able to use this system and have some degree of privacy when communicating. Objectives ...
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3answers
231 views

Salting in encryption (rather than hashing)

I am aware of the benefits of adding a salt to values that are hashed using a one-way function. Is adding a salt to a value that is being encrypted (using symmetric encryption) considered to be good ...
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2answers
265 views

Is AES feasible for secure hashing files? [closed]

There was already a similar topic "Why AES is not used for secure hashing, instead of SHA-x?", but it was not about files specifically, and I, personally, am not convinced by the answers in it. "AES ...
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3answers
510 views

find password and iv of an encoded string knowing the decoded string

If I would know the clear and encoded versions of a string could I somehow find the password and.or iv that wore used to encode it? Encoding done with open_ssl aes-128-cbc.
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2answers
77 views

encrypted emails and keyservers

I read that encrypted emails are secure, cause only who has your public key can decrypt it. I also read that it's a common thing to upload your public key on a keyserver. But if my encrypted email ...
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2answers
380 views

Hiding emails from Google [closed]

From what I understand Google reads/scans all my emails so that they cab "provide" targeted ads and maybe for other reasons. If a have a group of people who want to hide their emails from Google, how ...
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4answers
146 views

Sensitive information I don't want my work to backup

Can this be done safely? I want to print 2 pdf’s containing personal/banking information from a computer at work. It has CrashPlan Pro running and I don’t want a copy of the files to be made that I ...
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1answer
99 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
99 views

Can AES encryption prevent modifying bits in a wireless protocol?

I'm building an application with NFC which is a wireless communication protocol. An attacker can modify bits in a wireless communication protocol. I want to prevent this. I know we can't prevent an ...
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3answers
5k views

How long (in letters) are encryption keys for AES? [closed]

How long is the encryption/decryption key for an assymetric algorithm, such as AES? If I use AES 128-bit, how many characters should I type in for my key? What about AES 256-bit? Edit: Here is why I ...
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1answer
50 views

Permutation based file secure

I have a thought. 1. Take a file. 2. Read number of bytes. If its less than 2048, padd it till 2048 3. Read each byte. And create a single file which contains the particular byte. Give a random name ...
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1answer
426 views

Why the data in Aircraft's Black Box is Encrypted? [closed]

I have read somewhere that the Data in Air Craft Black Boxes are encrypted using various algorithm and only the manufacturers could gain access to the actual data of the BlackBoxe, Why the data in ...
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3answers
136 views

Encrypt a file, based on access

Is it possible using encryption keys to encrypt a file so for example some one will full access can read it all but some one with little access can only read say the top paragraph
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1answer
44 views

Cryptowall encryption files

This is a question concerning the way the Cryptowall ransomware encrypts files on the victim's computer. Someone knows if it is possible to recover the encryption key comparing the encrypted file and ...
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3answers
563 views

Which PHP encryption method is most incidentally-secure?

just started researching on the latest PHP encryption methods, I've found out my favorite algorithms are compromised. MD5 is no good, SHA-1 has "found flaws", SHA-512 isn't "meant for passwords", ...
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2answers
218 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 ...
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1answer
403 views

How do I find out what kind of encryption this is and how to decode it? [closed]

0xugm5chUcCO+KqKV58YwSwh3kMOHDFju8wtSIuZCbBAAFJaHkYDloRXz9qLEz3unGiAwZEyTvlRhnt6slOFZQ== Im wondering how to figure what this is and how to decrypt it.
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2answers
167 views

Are there any mail services that don't store encryption keys?

According to this article => http://www.howtogeek.com/166507/why-most-web-services-dont-use-end-to-end-encryption/ Gmail doesn't store the encryption key. But Gmail reads whole of users' email for ...
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3answers
4k views

Is a Pattern Lock any more secure then a typical text password? [duplicate]

I've been trying to find a way to secure a webpage that is easy to do (ie gaining access) yet still fairly secure. So, while a 4 char numeric password would be fairly quick to enter, it wouldnt be ...
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1answer
272 views

How to interpret these (en|de)cryption instructions? [closed]

I found this string on a forum HVrUyitih"fZnvWxbsQXrk6a61oxEWU0TvcagVKz1RvRTBbqpmuJ6zNWp5a5 ZO_ggA1ov6exdUTNREr"A5NthZt97Im60kBHn0sXUhwfN33ce5VvRfUItQyg ...
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2answers
455 views

May I `store` the password, by making it the key in AES-256?

I would like to seek for another way to save the credentials, which is used to verify the user trying to login, into my database. I came up with this idea. Since I believe that even knowing a ...
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2answers
109 views

Pad encryption against eavesdropping

In regards to security, Why is one-time pad encryption unconditionally secure against eavesdropping? Also, why does the triple DES use an Encryption-Decryption-Encryption combination rather than an ...
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1answer
1k views

Is Opera spying on its users when traffic conpression is enabled?

Correct me if I misunderstand the following quoted paragraphs, but basically to compress something it must be decrypted first. This seems to be the claim of the article but I don't see this as true. ...
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1answer
475 views

Encrypton method that would encrypt alphanumeric data to alphanumeric data [closed]

I need efficient way(possibly as strong as AES or AES itself) to enrypt (only) aplhanumeric data and get out only alphanumeric data, using some known library (i don't want and intend to implement AES ...
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1answer
519 views

What encryption hash function I should use for password securing? [duplicate]

Possible Duplicate: How to securely hash passwords? What is the best encryption algorithm? MD5, SHA1, SHA2 or maybe something else? Can you explain me why?
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1answer
45 views

Do we need to same PGP version for decryption [closed]

Requirement: In our company Location A uses PGP encryption and sending data over internet. In Location B, we have to decrypt the file. Question is what do we require in Location B Do we need to ...
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1answer
133 views

Gmail disclosing your account name to recipients? [closed]

My Gmail setting has forever been set to send emails with just my Gmail address as the identifier, so it should not send out my account name (first or last name)... or so I thought! Recently I got a ...
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1answer
71 views

Emulating Client by sending encrypted hexdump to dB server and getting response back [closed]

So I used wireshark to retrieve a hexdump that has been encrypted with RSA. I need to figure out what the response to that would be when it comes back from the server. How I imagine it would work ...
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1answer
64 views

Calculating the breakability of a given encryption method

I will soon be doing a very important project for school. The main goal of my project is to find a mathematical way to calculate the breakability of a given encryption method of ciphertext. Is there ...
-1
votes
1answer
168 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 ...
-1
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2answers
123 views

when integrity is implemented using encryption arises any problem?

when confidentiality is implemented using encryption arises a problem: "how the receiver knows the message is really sent by the sent as it is claims?". when authentication is implemented using ...
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1answer
151 views

Permutation in Block Ciphers

I was reading some e-books to understand the basics of block ciphers and how it works in AES. As i understood, Permutation plays a big part in AES and Block Ciphers, Here is what i understood by ...
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votes
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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votes
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 ...
-1
votes
1answer
225 views

Use openssl key to decrypt file in android/java [closed]

I want to decrypt file encrypted in openssl in java. File is encrypted with private key using openssl and on java side i want to decrypt it using public key. The code: public void testRSA() throws ...
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1answer
146 views

Is there a benefit to encrypting a file multiple times? [duplicate]

If I had to store a text file with some confidential information on the cloud, would encrypting the file multiple times (say, 3) with different passwords using WinRAR (AES with a 256 bit key) provide ...
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1answer
37 views

Choosing right way to secure access to server access via socket

I have an application running on a server, that has an exposed socket to the Internet to communicate with client that is/are application(s) on a phone. How would one go about properly securing the ...
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1answer
217 views

PCI compliant transparent data encryption at disk/folder level on Windows?

Is there a way to achieve PCI compliant data encryption at disk/folder level in Windows in a way that is transparent to applications(they must be able to write/read to encrypted folders/disks as if ...
-1
votes
1answer
416 views

How can an ISP throttle encrypted connections? [closed]

I have had experience with an ISP that slows down all encrypted connections (down to an average 20-35 KBps) I was wondering if a) this is legal b)how can they do it and c) is there a way to bypass it. ...
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votes
1answer
1k views

MCRYPT_RIJNDAEL_256 max key allow? [closed]

maximun key for MCRYPT_RIJNDAEL_256 ? mcrypt_encrypt( MCRYPT_RIJNDAEL_256, <<==hash_hmac using sha512==>>, $text, MCRYPT_MODE_ECB, $iv ) Warning: mcrypt_encrypt(): Size of key is too large for ...
-1
votes
2answers
127 views

Executing PHP WeService script by clicking a link within an e-mail

I'm receiving e-mail from my PHP/MySQL application with certain links. I was thinking on including an UUID as part of the link, which would point to a Web Service that ONLY reads those UUIDs. Those ...