Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

learn more… | top users | synonyms

1
vote
1answer
29 views

Importance of password strength with secure element?

Greetings SE security community. Background: I have a number of items like certificates, databases, and encrypted file systems that require private keys. In order to avoid having duplicates of these ...
0
votes
1answer
32 views

How is the Premaster secret used in TLS generated?

I believe that it uses some combination of the random values sent in the hello messages. From RFC 2246: (TLSv1.0) RSA encrypted premaster secret message Meaning of this message: If RSA is ...
1
vote
2answers
44 views

pci compliance and temporary files

Does storing temporarily a non-encrypted file containing some PANs violate pci requirements? (for example because it is being processed by an application, or to open it on a file editor)
-1
votes
1answer
75 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 ...
0
votes
2answers
68 views

How to generate a superkey to decrypt strings

I'm working on an application where users have a key or password generated by me that is used to encrypt a string. Each user has their personal key, and no user should be able to decrypt another ...
0
votes
1answer
30 views

Can any ECC field element be safely serialized as “compressed” and then restored as uncompressed?

I have a library that stores all its ECC Field Elements in uncompressed form, in a bloated Base64 XML format, and storage has become a concern. (We want to support QR code as a form factor,etc) ...
4
votes
2answers
198 views

Safety of using web based proxy?

Lets say for example I have to use a public online proxy like https://www.zend2.com to load a PHP webpage controlled by me containing sensitive data over HTTPS. How would I make sure that the proxy ...
0
votes
1answer
46 views

GPG encryption and signing

Why don't the commands gpg2 --armor --sign file.txt and gpg2 --clearsign file.txt have the same output? Also when I use just --sign I get a bunch of binary gibberish surrounding the message in ...
1
vote
7answers
171 views

What are the benefits of encryption for everyday people?

In addition to the fact that encryption systems like PGP are notoriously difficult to use, and that encryption doesn't always jive with cloud-based services like webmail, the fact is that most people ...
0
votes
1answer
61 views

What Linux software can I use to explore entropy of a file?

I've heard of tools that could be used to graph entropy of a file. Is there a graphical Linux program that I could use for this job that would let me conveniently explore which blocks of a file have ...
0
votes
1answer
34 views

Identifying stream cipher algorithm based on encrypted content

Is it possible to identify the algorithm used for the stream cipher based upon analysis of an encrypted stream?
2
votes
1answer
60 views

Would it be possible to add additional files to a password protected zip 2.0 file

So the scenario is this: I don't have the ability to determine/recover the master password for a production system that uses zip 2 archives. However, I need to be able to add new files to existing ...
0
votes
0answers
9 views

How to store hexencoded ciphertext in Java [migrated]

I am tasked with finding the secret message and I believe that I will have to XOR the different ciphertexts, but I don't understand how to store a ciphertext in a variable in Java. I could not find ...
0
votes
1answer
31 views

In TLS1.2 AES-GCM mode, what happened when input is not exactly the multiple of its block size?

I know that AES-GCM mode does not need padding, and its output are exactly the length of input data plus the tagging. But I am a little bit lost, as AES itself is block cipher, it could only operate ...
0
votes
1answer
90 views

can I trust Boxcryptor closed source software? Encryption of files for cloud hoster

Boxcryptor https://www.boxcryptor.com is not Open Source. Can I trust this? Is it secure? No government backdoor? Because there is no alternative for OS X and iOS.
0
votes
1answer
66 views

Using ECC like RSA, to Encrypt/Decrypt

Is there any way to implement encryption/decryption using ECC, like RSA does? For example, say some user wants to send a message containing a symmetric key to user X. Then, in RSA, I could just ...
1
vote
0answers
73 views

Traveling abroad with encryption software on my computer [closed]

I have software installed on my computer that has encryption capabilities. This is the case both for things like VPN/SSL, and also GPG. I don't really use GPG (there are not that many people I can use ...
0
votes
0answers
32 views

Sector of small data encryption and transmission

I'm not sure my question is right for this site but still, since its information security so here it goes, I really want to know is there any sector of data encryption that allows or deals with very ...
-1
votes
0answers
11 views

how to devise a packet into different blog to encrypt by AES

i need to encrypt a packet about 1024byte but my code can only encrypt 16byte. i wanna know how to devise it into several parts to encrypt by AES. and i wanna the answer can be used in C language...
1
vote
6answers
810 views

Is it theoretically possible to decrypt a file without the key/password?

Hear me out ... On TV shows like Criminal Minds they make it out to appear that any encrypted files can be easily decrypted, even without a key. The character, Garcia, just simply "pushes some ...
0
votes
2answers
65 views

Are files hosted on cloud servers/websites/databases manually checked by people?

I was wondering ... when I upload a file to, say, Dropbox, does anybody personally check it to see what it is? Say I upload a copy of my Blu-ray movie to cloud storage ... will anyone check, and ...
0
votes
1answer
45 views

What is the strategy used by the itunes store and Google Play to protect and securely install applications on eligible devices?

The requirements for a system like itunes store or google play are as follows; identify and authenticate the user determine if the user has paid for a given app if s/he has, securely transmit the ...
2
votes
1answer
84 views

Properties of AES Encryption

First of all, I apologize if these questions can be answered using a web search, but I'm sort of a crypto noob and don't know what to search for. Given N AES encrypted messages (where the message ...
-1
votes
1answer
87 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 ...
3
votes
1answer
212 views

Encrypting data within SQLite database in JAVA - How to store key?

So, a bit of context before I start may be handy. I am developing a JAVA desktop application which will use an SQLite database to store/process data. The application will utilize authentication to ...
1
vote
1answer
137 views

How to decrypt a file when I have its key?

How could I decrypt a file (encrypted with AES-128) using openssl ? I do not remember the passphrase I used to encrypt it, but I saved the key generated and used to encrypt my file. How could I use ...
66
votes
5answers
6k views

How can my employer be a man-in-the-middle when I connect to Gmail? [duplicate]

I'm trying to understand SSL/TLS. What follows are a description of a scenario and a few assumptions which I hope you can confirm or refute. Question How can my employer be a man-in-the-middle when ...
2
votes
0answers
41 views

How to identify an encryption algorithm [duplicate]

I have found a small encryption in a programm and would like to identify it, in terms of the public name. I have been programming with a DES and with TEA, but what i have here is not even similar with ...
1
vote
0answers
16 views

PBKDF2 hashing over TLS for encrptig password [closed]

i wanna use PBKDF2 hashing over TLS for encrypting password and session and that way stop hackers from breaking into my connection. How to do it in java.
4
votes
1answer
135 views

Why run ondemand scanners in failsafe mode when the virus could have encrypted itself?

The internet is full of guides of how to remove malware on already infected computers. Normally, step 1 is to enter failsafe mode, so that the virus can't interfere with the anti-virus program that ...
13
votes
3answers
2k views

Is amazon S3 secure enough to hold personal documents?

I have a client who is looking to hold personal information such as Driving Licences and Insurance documents in order to verify if a user of the site is who they say they are and lives where they say ...
1
vote
2answers
245 views

What's the point of the nonce in CTR mode?

Does having a nonce in CTR mode actually improve security (vs. just using 1, 2, 3, etc. - basically a constant nonce of 0)? As far as I can tell, the best-case scenario security-wise is that the ...
1
vote
1answer
93 views

How do web email clients store my passwords from other providers?

The situation comes down to this: When I enter in hotmail, it retrieves my messages connecting to other providers: they could only do so by using my email and password. Since I had signed in a ...
1
vote
2answers
145 views

This protocol is vulnerable, but why?

I know that the following authentication protocol is vulnerable, but I can't understand why. A and B share a secret key K (64 bits) R1 and R2 are two 64 bit numbers A-->B: I am A B-->A: R1 ...
1
vote
1answer
68 views

How to find encryption method?

How to find encryption method if both encrypted and decrypted code known? ...
0
votes
0answers
58 views

How to secure my REST API once user authenticates with Google on mobile client?

In my application, I build REST APIs so that user can interact with my application server. Since I do not want to maintain User/Passwords, my iOS app authenticates client using Google. This all ...
1
vote
2answers
63 views

Byte swapping encryption algorithm security flaws?

Honesty commands me straight away to say that I'm not a professional, but I'm fascinated by data encryption. This algorithm won't be used in production code, so please don't flood me with "Don't ...
2
votes
2answers
157 views

Is it possible to use bitcoin miners to decrypt files/communication?

My understanding is that miners solve complex algorithms (sha256 i believe) and receive bitcoins. With the amount of hash power all these pools get from miners couldn't they use the resources to ...
0
votes
1answer
74 views

What is the best way to protect an encryption key? [duplicate]

I am using few secret keys to encrypt sensible date. What is the best way/place to protect the keys ? In a file located on my server ? Within the SGBG databse itself ? Or ... ?
0
votes
1answer
54 views

Steps to create user authentication system between mobile and server

First time doing a secure login from a mobile app to a server (built in java). I want to understand if I got this right. Login in for the first time: 1. On the mobile device hardcode a security ...
0
votes
2answers
103 views

Store a file on a harddisk without root having access to it

Is there a way to store a file on a disk as a user so that even the root user has no access to it? I tried EncFS but that is no solution because the root user can switch to every user, so he/she can ...
-1
votes
4answers
239 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 ...
0
votes
1answer
46 views

Publicly Available API + Sensitive ID/Key Transmission Over HTTP

I've run into a predicament... I'm developing a mobile application that utilizes a server for various things. One portion is that it stores an id/key pair related to accessing and processing ...
1
vote
1answer
38 views

Substitute Key on 128 Bit Encryption

I'm trying to obtain a copy of program that uses 128 bit encryption, I've been denied since it could decrypt ANYTHING that anyone else has saved in it. I suggested giving me the program, but on mine ...
0
votes
0answers
32 views

Converting PGP2.x UIDs on a GPG key

I have a couple of keys which were created many years ago, before GPG came out. (But let's pretend there's only one key involved.) The key has a mix of GPG and PGP-2.x-style UIDs. I've made one of ...
0
votes
0answers
29 views

Key differences between IPSec and HAIPE?

HAIPE is derived off IPSec but can someone draw up the differences between using IPSec with Suite B crypto and HAIPE with Suite B? We can drop Suite A or classified info for this question; staying ...
0
votes
0answers
54 views

Where to save digital content and prevent sharing?

I've been inspired by the answer to the question here: Location to store an encryption key It gave me a lot to think about. My friend and I are building a website and we've encountered a problem in ...
1
vote
0answers
61 views

Does cross platform (authenticated) volume encryption exist?

Note: this is not the same as What is a self-contained cross-platform encryption for USB drive?. I believe my question is on topic because I'm not asking for a recommendation. I'm asking if such a ...
0
votes
0answers
29 views

More known about high success rates of decrypting phone taps?

The Wiretap Report 2013, http://www.uscourts.gov/Statistics/WiretapReports/wiretap-report-2013.aspx#sa5 states that the number of state wiretaps in which encryption was encountered went up from 15 ...
1
vote
2answers
99 views

Creating an application in which all user content is encrypted

Does any one have references or sources on how to approach developing a web application in which the content is encrypted and unreadable for the developers or company owners; I'm referring to content ...