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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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 ...
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1answer
89 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?
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1answer
188 views

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

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 encrypted archives. There ...
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1answer
257 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 ...
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2answers
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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.
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1answer
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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 ...
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0answers
115 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 ...
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0answers
40 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 ...
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6answers
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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 ...
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2answers
330 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 ...
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1answer
93 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 ...
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1answer
457 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 ...
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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
7k 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 ...
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1answer
526 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 ...
79
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5answers
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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 ...
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0answers
55 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 ...
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1answer
186 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 ...
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3answers
4k 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 ...
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2answers
1k 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 ...
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3answers
312 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 ...
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2answers
185 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 ...
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1answer
237 views

How to find encryption method?

How to find encryption method if both encrypted and decrypted code known? ...
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1answer
307 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 ...
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2answers
155 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 ...
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2answers
4k 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 ...
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1answer
327 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 ... ?
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2answers
875 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 ...
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2answers
175 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 ...
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5answers
1k 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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1answer
213 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 ...
0
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1answer
62 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 ...
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0answers
104 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 ...
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0answers
272 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 ...
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38 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 ...
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2answers
131 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 ...
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0answers
90 views

Private data encryption in database in case there is no password

I am currently investigating the architecture of the secure, but user friendly service, which combines storing of sensitive private data together with simple authorization procedure. The approach ...
0
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1answer
245 views

Advice on using encryption and hashing

I'm going to rephrase a question I asked earlier, as I don't think anyone understood what I meant. Bascially I'm writting a web based password locker, which can have multiple accounts; so that users ...
0
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1answer
111 views

Using encryption and hashing

I'm writing a project to securely store and share passwords between users, I've been doing tons of research into encryption algorithms, CSPRNGs, hashing algorithms, key stretching etc... I just want ...
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2answers
140 views

Isn't this the same as using a certification authority?

Taken from Wikipedia, here is the pretext to my question: A certificate authority (CA) is an organization that stores public keys and their owners and every party in a communication trusts this ...
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2answers
55 views

What is the likelihood of a government organization having a copy of the major .COM private keys? [closed]

This is a bit of a vague question, but it seems relevant these days with the information on all those "mass spying" programs getting leaked. I will describe the scenario and I just want to know if it ...
3
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5answers
2k views

Password protect an excel file for a period of time?

I'm trying to find a way to password protect an Excel file (.xlsm) beyond the built-in password encryption options. Ideally: Enter the password File works for a week(/other period of time) After a ...
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0answers
383 views

Best approach for storing banking information

I am currently developing an auction desktop application. At the moment I am storing the buyer and vendor information in 2 separate tables within a MySQL Database. Currently the data for these tables ...
0
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1answer
222 views

Securing user postal address in a database?

I've been assigned a web project that deals with shipping goods between two parties. I am unsure what a secure database scheme (if any) would be for storing the recipient's postal address and whether ...
2
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2answers
310 views

What happens after setting up HDD password?

I am wondering what happens when I set HDD password in my laptop (Samsung with ssd). I mean a given case. I have been having working system without any password. Then one day I decide to set up HDD ...
4
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3answers
919 views

How to check that an e-mail service provides encryption between the mail servers?

How can I technically verify* that the e-mail I'm sending from Gmail to Yahoo is encrypted all the way from Gmail's servers to Yahoo's servers? I know that it's advised to have encryption between the ...
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2answers
194 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: ...
33
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3answers
2k views

Why do WordPress installations retrieve the crypto secrets remotely on installation?

It seems that WordPress retrieves all the crypto constants remotely (via HTTPS): // setup-config.php $secret_keys = wp_remote_get( 'https://api.wordpress.org/secret-key/1.1/salt/' ); Are there ...
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2answers
87 views

Public e-mail Encryption Certificate

I'm quite new to this, so don't be too hard on me. I'm currently using the CipherMail MTA to generate e-mail encryption certificates. I created an own CA and public and private keys for our contact ...
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2answers
2k views

How to store passwords securely in my server?

Disclaimer: I know I should use bcrypt to securely store user's passwords. Please, keep reading. I want to store credentials for several email services for each user. So if I log in with my username ...