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

0
votes
2answers
31 views

Is End to End security possible without physical contact?

I noticed that a lot of messaging start to provide "End2End" security, but I wonder how this can be possible without a key exchange between the the two clients. To my understanding to provide real ...
-2
votes
0answers
28 views

Encoding scheme and padding with '=' [on hold]

Does anyone know which algorithm uses '=' as padding character besides Base64? I got the encoded text ...
0
votes
0answers
18 views

Securing decentralised cloud scaling

Approach Require a certain percentage (quorum) of nodes to agree in order for my decentralised multicloud to grow. Benefits Reduced likelihood of growing too quickly (e.g.: 2 new nodes created ...
0
votes
0answers
24 views

Hiding symmetric key inside encrypted data

My server generates an AES encrypted file which when downloaded acts as an input for an application. So, should I hardcode the symmetric key inside the application or should I randomly generate the ...
0
votes
0answers
22 views

Are there any alternatives to EFS for transparently encrypting the contents of a folder in Windows?

EFS is not an option for me because I'm using Windows 7 Home Premium. Encrypting the entire drive with VeraCrypt or Bitlocker is not what I'm looking for because I am dual booting with Debian.
0
votes
0answers
19 views

How should I approach learning Verifiable Encryption?

I need to act as a proxy for certain types of encrypted data, and I want to make sure that my service isn't abused. To that end I need to verify the general structure of the data going through my ...
2
votes
1answer
53 views

Asymmetric / end to end encryption for web messaging app

Background I'm trying to design a secure and sustainable web app for messaging. The purpose is to learn how to create secure web application. The application is suppose to be written in Javascript ...
3
votes
0answers
72 views

Generate secure one-time codes containing information

I need to create a system that allows a user to enter codes to charge an allowance. Embedded in this code should be the amount to charge the allowance. The user would pay for a code which would then ...
1
vote
0answers
27 views

OpenID Connect: Why use authorization code flow?

I have a question about implementing OpenID Connect I was hoping I could get some help on. I understand the different flows and get that the authorization code flow is good because it allow client ...
2
votes
0answers
22 views

Is there any reason to use AesManaged over DPAPI in this scenario?

I have a situation where my web application is going to be deployed on multiple web servers, and I'll be wanting to store some securely encrypted data on the DB servers (each web server has a DB ...
0
votes
0answers
9 views

encrypting chip data and accessing from other platforms [on hold]

i have a similar, yet somewhat differing question. I am not so interested in encrypting the phone per se, but the chip and data within it. I am interested in knowing if the bundled or downloadable ...
0
votes
2answers
135 views

Is this the most secure encryption/hashing system? [on hold]

I've been doing some research regarding password security and after reading several topics and the Kerckhoff's principle. I came up with what I believe is a really secure system regarding online ...
15
votes
9answers
3k views

Hide the fact of e-mail communication

Bob has a mistress. Her name is Alice. Bob`s wife Eve knows Bob is unfaithful, but she does not know who the mistress is. Alice does not know Bob is married. Bob needs to communicate with Alice over ...
0
votes
1answer
75 views

Safely encrypting data received through HTTPS

I am receiving sensitive data over an HTTPS connection and need to store this on disk, encrypted so no one can tamper with it, but for reading later on. Each user in the system has a password. The ...
0
votes
0answers
11 views

How may I get the Adminstrative Authorizaton or access for an encryption green color folder, ?" [closed]

I have create an encryption of my one of the folder then it become green color, and automatically generated a folder on my DOCUMENT folder, but later I unfortunately deleted the folder, although I had ...
0
votes
0answers
46 views

Is it safe to encrypt data by simply randomizing chunks based on a permutation? [migrated]

Say I want to encrypt the following text: "Today is March the 22nd, 2015". And say want to encrypt 8-byte blocks of data using the following permutation [6,3,0,1,5,7,2,4] to swap characters at those ...
2
votes
2answers
47 views

Converting ECC Private key to PKCS#1 format

Is there any way to convert an ECC private key to RSA PKCS#1 format? I have tried converting it to PKCS#8 first using OpenSSL: openssl pkcs8 -topk8 -nocrypt -in EC_key.pem -out pkcs8_key.pem This ...
2
votes
1answer
116 views

Is this a sensible way to encrypt user data?

I want to make a site for storing sensitive user data, that retains per-user data encryption in the event that the database is compromised. This is the model I was thinking of, to give the best ...
0
votes
0answers
45 views

Is it dangerous to use the same key (RSA) for both encryption (PGP) and authentication (SSH)?

Alice wants to send an encrypted message to Bob, but she also wants to connect to Carol's server. Are there any dangers associated with using the same RSA key for both PGP and SSH (other than a lack ...
1
vote
1answer
74 views

What is the safest way to encrypt a password that can be decrypted at a later time?

In a web app I'm building, I need to use Apple's AutoIngestion tool for iTunes Connect. In this tool it seems the only way to use it is to send a password in plain text. What would be the best ...
3
votes
1answer
438 views

Why does GnuPG shrink my file after elgamal encryption?

I would like to run GnuPG elgamal encryption for at least a few minutes. The only way I can think of is to create a large file to be encrypted. So I created my file like this: dd if=/dev/zero ...
0
votes
0answers
34 views

What can I do with a SSH certificate? [migrated]

Doing an information security project at the moment. After gaining access to ftp drive, there was a file simply called 'hackme' inside. It contains what looks like to me a SSH certificate, but not ...
0
votes
0answers
11 views

Finding out key size used in ECDH algorithm in C#? [migrated]

I am a beginner when it comes to any EC algorithm, so please help me understand this basic question. While reviewing the C# code, how can we find out the key-size used in the ECDH implementation? or ...
0
votes
1answer
48 views

Security at application layer

Originally asked on http://crypto.stackexchange.com/questions/24430/security-at-application-layer but was suggested to ask here instead. I saw lots of questions asking about encryption over http, ...
2
votes
2answers
44 views

Does changing the default number of iterations in KeePass (or other encryption applications) increase security?

Inspired by this question about the difficulty of cracking a KeePass database, I'm wondering if changing the default number of iterations in an encryption application (e.g., KeePass) increases ...
1
vote
1answer
21 views

What's the value of data partition encryption for database files on a postgres database server?

We're in the process of rolling out a postgres based web app, and I'm trying to understand the value of encrypting the entire database. In postgres's case, the only way to do this is store the ...
3
votes
1answer
64 views

Is it possible to prove the content of an encrypted message without disclosing the private key?

Suppose that I sent Bob a message saying, "The meeting is cancelled", and encrypted it with his public key. Could he share the plaintext with other people, without disclosing his private key (and ...
0
votes
0answers
3 views

Why does consecutive permutations or consecutive substitutions not enhance security? [migrated]

My professor stated that permutations which are done repeatedly does not further enhance security than just one permutation. He also stated that fact this applies to consecutive substitutions as well. ...
0
votes
1answer
85 views

Why my files that Encrypted with EFS in Windows 8.1 shown in Linux ubuntu?

i Encrypted my files with EFS in windows 8.1 so i logged in ubuntu and without any warning , its shown my files actually not Exactly the file but shown the path of file and the name and i can ...
2
votes
1answer
45 views

Is there any College, State or Government ID that transmits a offline verifiably encryptable data blob?

I'm looking for any way to digitally verify a user, ideally with a photo and link PII to that user. My use case is that a user will extract and send an encrypted data blob (say from a passport) to my ...
5
votes
1answer
124 views

What are the security differences between SMIME email and PGP email? [closed]

Outside of key distribution, and specific to the technical details relating to encrypted email data (message body), what's the difference between SMIME and PGP? Example comparisons Security ...
0
votes
1answer
52 views

WPS and WPA2 connection methods

Do clients use WPS every time when they connect to a WPS-enabled AP? Or maybe they do it just the first time and then they switch to a normal WPA/WPA2 key exchange? If the latter, it's possible for ...
16
votes
4answers
3k views

Is it dangerous to publicly share ciphertext?

Alice wants to share a message with Bob, but Alice and Bob can never be in the same place at the same time. We can assume they both know each others public keys (or agreed on a shared key, if that ...
0
votes
1answer
66 views

What are the best practices to store payment processor dev/API keys?

I am integrating with multiple payment processors which have their set of public/private keys. This would be used in conjuction with per user keys, to bill clients. I was wondering what is the best ...
0
votes
1answer
82 views

rainbow table for AES 256 CBC knowing IV, cipher text and plain text

I'm in a situation where I know that I have to decrypt a file encrypted using AES 256 CBC and I've the following details: I know the first 16 bytes block in plain text I know the IV (static 128 bit ...
1
vote
1answer
36 views

Using scrypt to encrypt data in a session variable

Let's say I want to store some data in the node's session, for example, like an authenticity token. Obviously I want to store it in an encrypted way if it's going in a cookie, then decrypt it on a ...
2
votes
2answers
168 views

What is a current best practice example of basic encryption and decryption in PHP?

I have a good working knowledge of basic security best practices (password hashing, preventing sql injection, CSRF, etc.) but am completely at a loss for finding a solution to common-case encryption ...
1
vote
0answers
22 views

How is Tresorit client-side encryption key stored and managed?

I am using Tresorit on Mac OS X and iPhone. When I am using it there is always applied client-side encryption before posting the file to cloud. The key used for encryption is AES-256 and CFB mode of ...
0
votes
0answers
24 views

Cryptsetup using TPM? [duplicate]

Does cryptsetup uses TPM? or CPUID to identify the hardware environment in order to prevent it from stealing and crack it on other PC.
1
vote
1answer
83 views

Is End to End encryption possible for all servers across the whole infrastructure?

Running into a possible situation where a client I am working with is requesting that all data that leaves the servers should be encrypted and here, we are talking of hundreds of Linux servers ...
0
votes
0answers
20 views

Why encrypt client<->server on top of TLS? [duplicate]

I want to implement TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 between my client and my server. However, someone advices me to add my own encryption&digital signature on top of it (adding a suite of ...
0
votes
0answers
38 views

“gpg” vs “openssl rsautl” (asymmetric keys) for credentials storage

I'm working in a PHP project and need a better solution to store credentials to a client's database, and I'm thinking about encryption, I put to work both gpg and openssl using asymmetric keys, but ...
0
votes
1answer
47 views

Feasibility of creating an in-memory web app (that runs from a CD-rom on a web server) for sharing self-destructing messages

This question is about a hypothetical in-memory web application that is used for exchanging encrypted messages that passively self-destruct in X amount of minutes. Here the messages would be stored ...
1
vote
2answers
99 views

How to secure sensitive information on cloud from administrator (end-to-end encryption)

When I use end-to-end encryption to secure documents and sensitive information on cloud or on computer, there is always a risk of accessing these information by administrator. For example if you use ...
2
votes
1answer
61 views

Is ENCFS secure for encrypting Dropbox?

I've encrypted my dropbox-folder with encfs according to a few tutorials I found on the web, advocating this approach. But I've found the following critical statement concerning encfs'security in ...
1
vote
1answer
80 views

How to keep a reasonable level of entropy in an encrypted file?

Encrypted (or random) data, by nature exhibit a high entropy value and non unencrypted data will exhibit a low entropy value. From an attacker point of view the precense of this high entropy value in ...
1
vote
1answer
56 views

Can I create an application that can decrypt data but the administrator of the application cannot?

I have a windows application with a configuration file that contains some database passwords. I'd like to encrypt this data in such a way that my application can decrypt the data, but that the ...
0
votes
1answer
57 views

Security tradeoffs while designing a mobile Web Service API

I'm not a security expert but I want to ask about tradeoffs in a web service API I'm designing for mobile apps. It is an API which tracks users' locations so yes, the data is reasonably sensitive. ...
17
votes
8answers
3k views

Is it possible to construct a passively self-destructing message?

Is it possible to construct a message that passively degrades over time without requiring an external factor to destroy it? Things that are similar, but not what I mean: A hard drive that degrades ...
2
votes
1answer
81 views

Secure database password stored in an env variable

I need to somewhere store my DB password on my production environment to access the DB. At the moment the prod system is deployed in the cloud, so is the DB. The password, the username and some other ...