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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Exchange of encrypted files through a server

I have a thing to do, that basically bases on a server that is honest but curious. Therefore I want the server to have the public key for encryption and it will encrypt files during the process of ...
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1answer
758 views

PHP/Ajax Data transmission security

I'm learning about web security mechanisms. I have developed the following system in PHP and JavaScript: assuming that I have a page named: messages.php which is a real-time chat system. first when ...
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1answer
70 views

AES Key Generation?

I am generating a random number and using the random am generating the AES key of 256 bit. If I use the same random number again, whether it will generate the same AES Key again ? If not means why ? ...
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1answer
547 views

Current Encryption Algorithms? [closed]

What are some encryption algorithms that are currently in use by secure websites, by operating systems, or by Secure USB thumb drive manufacturers. I am trying to do research on differences in speed ...
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1answer
58 views

using asymmetric encryption to encrypt private key [duplicate]

Just a small question: I know it is common for one to use asymmetric encryption in order to encrypt his private key, when using symmetric encryption. Is there a name for this process/method of ...
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2answers
207 views

How to store my contacts encrypted?

I use KeePass for storing my passwords. What should I use if I want to store my several hundred contacts (name, phone number, email, etc) encrypted?
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2answers
93 views

How to use encryption on proprietary software

I wonder if it's possible to develop a secure point to point encryption application (a pgp message application for example) on a proprietary software. If such an application was developed, let say on ...
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2answers
1k views

Can the U.S. goverment crack encryption? [closed]

Does USA government have the sufficient processing power to crack keys in matter of seconds? Let say 2048-bit RSA, for example. Since the RSA algorithm was developed by USA government (NSA?), I ...
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1answer
665 views

Is AES more secure than Rijndael? [closed]

Which algorithm is generally considered to be more secure, and is AES-192/AES-256 still considered to be secure? After reading this it's lead me to belive that the Rijndael algorithm would be a more ...
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2answers
297 views

Find DES encryption key having input and encrypted output

Having the source string: S3nh4#1 And the generated encrypted string: csf7259aT07Rw Using this script, it identified the algorithm used to encrypt as DES(Unix) I wonder if it is possible (in ...
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2answers
142 views

Is this adaptation of using a One Time Pad safe?

For example, lets say there are two people named, Bob, and Jim. Bob wants to send Jim a long secret message, and he decides to use a OTP to encrypt his message. Both Bob and Jim know a secret ...
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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
942 views

Cascading Encryption Algorithm using mcrypt or GnuGP

I'm trying to a cascading cipher encryption algorithm to encrypt a textfile via mcrypt. I'm essentially trying to emulate the behavior of TrueCrypt, where it can cascade two or three different cipher ...
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2answers
100 views

2 way encryption of a string into numerical string using random number

I have a random number like 0.323978544752212. I want to encrypt a string using this random number into to numerical string i.e. final string is like ...
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votes
2answers
71 views

Identifying/decrypting hashed/encrypted data [closed]

This weekend I took part in an security challenge. I had great fun doing it but i found a huge gap in my knowledge that I'm really keen to fill and hope someone here can help get me pointing in the ...
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2answers
152 views

Crack Unknown Encryption [closed]

I was challenged by a friend to decrypt a piece of text that was somehow encrypted. The encrypted text is the following: ...
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2answers
201 views

I want to implement UART module in Xilinx with Encryption functionality so which algorithm i shuld choose RSA or AES [closed]

i designed code for uart module now i want to include Encryption code before sending the data which algorithm is better for me RSA or AES
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2answers
197 views

What was the Lavabit's backdoors to their customers' e-mails? [closed]

There has been some talk about the Lavabit's case. New info was published today, but not important. I'd like to know how Lavabit worked. First I thought they just did something with OpenPGP. Then I ...
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1answer
1k views

How does DES provide confusion and diffusion? [closed]

I know that Data Encryption Standard (DES) provide strong security but I want to know how does it provides confusion and diffusion?
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1answer
59 views

Tell type of encryption if given both input and output strings [closed]

I have the string Thisisatest that is encoded as MDQ4MGFhMzRhYTNkYjM1OGIzN2NkZTJhYjZiNjUzMjY= and I am trying to find out what encryption is used here. I think that the encoded string is base64 ...
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votes
1answer
84 views

Is it really worth to spend time on Telegram Crypto Contest? [closed]

Telegram is running this crypto contents. But what I heard from some people on the web is that they designed the contest in such a way that they made it practically impossible to crack. Is it really ...
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1answer
53 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 ...
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votes
1answer
206 views

What kind of encryption is this? [closed]

I'm trying to discover what type of encryption was used to generate this strings: Qo94v0JpPaL59LS6U3xfEB4nVgc= +3ZaEliGZ7DWte+LaviHvOlcg9A= v44x/KnS/JyOVDtbmbkFkJEgkWs= y75nHoG/yXwutlixBX7/jRXsv+o= ...
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votes
1answer
102 views

I want to encrypt content on USB or SD Card [closed]

I want to encrypt the content on a USB or SD card that can only be decrypted by an app installed on any device or TV. When the USB is not connected to that particular app, it should not be accessible. ...
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1answer
1k views

Is it possible to encrypt WiFi connection?

Is it possible to encrypt (encrypt traffic) WiFi connection from my laptop to my router? If anyone of you did it? How I can do this?
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1answer
321 views

OTR encrypted chatroom or IM [closed]

I need a secure, encrypted environment for conducting text based interviews online. It's for academic research purposes where data protection is paramount so there cant be any data stored on 3rd ...
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1answer
42 views

Sanity check security scheme, is it secure? Is there cruft?

This article: Life in a post-database world: using crypto to avoid DB writes Prompted me to write this url-crypt Node.js module to convert a Secret into secure urlsafe base64 strings. Think of an ...
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1answer
187 views

Who can help me decrypt [closed]

There is a string: 51141010379856000173550010000111151512908026 which after encryption becomes: l4yAOVWeHlk4tnNu3HlJnxMUppeOWCpIqmRKkUPQHlgNawdYMDK2mnieDazPkJuI ...
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1answer
445 views

How to store a hexadecimal string representation in C++ for use in cryptography

Homework question The full question is the following: Suppose you are told that the one time pad encryption of the message "attack at dawn" is 09e1c5f70a65ac519458e7e53f36 (the plaintext letters are ...
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1answer
415 views

How to decrypt javascript code extracted from PDF

I analyzed PDF, and extract javascript code. But javascript code is encrypted. I can't decrypt it. Please advise me. javascript code ...
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1answer
156 views

US Export Laws (Encryption Cloud Service) [closed]

Okay - so I have been extensively looking into US export/import laws relating to encryption software (5D992), however I have a few questions about the laws and their applicability. So, the laws ...
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0answers
55 views

Copyright Issue? [closed]

Few months ago, I have created a few icons for my app and after copyrighting them, I published them on my website. I clearly stated on my website that it is illegal to use my icons for commercial or ...
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2answers
644 views

How to minimize your fingerprint, or become invisible on the web? [duplicate]

With all of these news stories about the government reading emails and snooping information from other sources, what are ways to minimize or eliminate an organization's ability to actually track and ...
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1answer
273 views

Development of asymmetric encryption algorithm? [closed]

I am planning to develop (make some minor changes) to asymmetric encryption (i.e. RSA). Any suggestions please?
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2answers
735 views

How to tell what encryption is being used [closed]

How do you tell encryption algorithm used by reading its output? Here is the one I am trying to figure out Åbd$ý ...
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votes
2answers
542 views

how to identify plain text from cipher [closed]

I am trying to find what encryption algorithm has been used in this code original text: 11011698 encrypted text/cipher: uIC4hZFECIAYMi%20FWxamjQ== original text:11008569 encrypted text/cipher: ...
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votes
2answers
2k views

Is pixel based image encryption secure?

I have encrypted an image using pixel encryption method. I just used a bmp image for that. What I did is, I retrieved each pixel value from the image and obtained the value of red, green and blue ...
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votes
1answer
101 views

What is the algorithm of bcrypt? [closed]

In many places I heard that people recommend to use the bcrypt algorithm to save passwords into database while creating web applications.I want to know what is the algorithm used to bcrypt a password ...
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votes
1answer
38 views

Which encryption technique should be used for users name and passwords in my notebook [duplicate]

i writing all my passwords and users names on my notebook emails,amazons,facebook. and i have really Nosy little's brothers that will probably look at my notebook when i am not around, which ...
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votes
2answers
180 views

Security and privacy in email and other communications [closed]

In the light of newly discovered events like the NSA's PRISM program, I'm really concerned about the privacy & security of my personal emails. Chances are governments already have backdoor access ...
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votes
1answer
83 views

AES 256 bit key to plaintext conversion? [closed]

I'm a little rusty on cryptography, but I have successfully acquired a 256 bit key that is used for encryption and I want to know if it is possible to reverse it into its corresponding plain text ...
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votes
1answer
58 views

Algorithms to store and send data

I would like to store data, and send it by mail. What is the best way to encrypt it, and being able to decrypt it? My guess would be RSA, but is there a better way? (Considering that the other person ...
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votes
2answers
101 views

Facing hard encryption [closed]

I have a little problem with encryption. I have this cipher text "AA969CF9657F77C597C8EAFF1594D59374E4977F" and i know that correspond to "http://jogos.meo.pt/". I have another samples, but i can´t ...
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votes
1answer
109 views

What is this encrypted with or where can I find examples of encryptions to compare it with? [closed]

I have a hash thingy I am trying to decode and I have done relatively little with encryption, though I would like to try to learn some more. The hash is: 1YMTpavsFq7ykllC3CCsg3e1li31re1nROxuW1wqIqpk ...
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votes
1answer
2k views

How do I unencrypt emails from a pst file without a digital certificate? [closed]

I saved a pst file on a CD. It contains a lot of email that was sent to me using a digital signature. I am now in a lawsuit and need to print out those emails but no longer have access to my digital ...
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votes
1answer
1k views

is there better email, file, disk encryption than PGP? [closed]

Currently, I am using Symantec's PGP desktop whole disk encryption for my Mac. After hearing that FileVault was insecure and supposedly easily crackaable. However, PGP has been around for a long ...
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votes
1answer
194 views

What are the risks if a weak ciphers are accepted by a technology that uses SSL

The TLSSLed tool found that the host that I use has SSL connection that accepts 8 different TLSv1 and SSLv3 ciphers that are weak by their length (40 bits). How can an attacker exploit this fact?
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votes
1answer
28 views

data flow management steps [closed]

i am having queries on data flow management.what is the sequence flow using to transmits & receives data.? by using below techniques 1.encryption 2.decryption 3.message digest 4.splitting ...
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votes
2answers
180 views

Using my own encryption instead of https in app

I am writing a program that uses a webserver as a backend for communication between different users. Is it okay to use my own encryption (such as ...
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votes
3answers
360 views

PHP web application security [closed]

I am building a PHP web application, that needs enhanced security, due to the fact that it contains very sensitive information (in a database). I think that I want to use self-signed SSL ...