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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Check HMAC after completing decryption or before?

I have written a piece of software that symmetrically encrypts big files (multi-megabyte). Plaintext is encrypted, after the encryption the HMAC is calculated and written into the header of the file. ...
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78 views

How to determine if mail was encrypted during transport using the header information?

First things first: I know about the difference between end-to-end-encryption and transport encryption. Back to topic: I already read some things about how mail server handle transport encryption, ...
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32 views

Security implications of providing an encryption/decryption oracle

I need to provide a service that acts as a symetric encryption/decryption blackbox : the box get a secret key k users send datas d, and get ciphertext c = Encrypt(d,k) users send ciphertext c, and ...
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33 views

Getting multiple key matches on plaintext/ciphertext pairs in double DES

I'm trying to implement a Meet-in-the-Middle attack and just to test it out I've done some hardcoding of values, which is simply this block of simple code: byte[] key1 = new byte[] { 0x20, 0x00, ...
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1answer
53 views

Are OpenSSH vs OpenSSL public key format names mismatched?

I generated a key pair vis OpenSSH and later wanted to generate PEM encoded public key. I noticed that generated public key differs when generated by OpenSSH vs OpenSSL when using same format name ...
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2answers
154 views

Is there a way to securely store unsalted passwords?

So, obviously I'm not talking about username/password pairs here, I plan to store passwords with two salts and three hashes, but what occurred to me is that if I had a table where I kept pairs: ...
2
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2answers
217 views

My Virgin Media account password is visible in plaintext to call center staff. What do I do?

Whilst on the phone to support staff (about billing) to Virgin Media, perhaps the largest ISP and telecoms company in the UK, I was asked to confirm my password over the phone. I asked the advisor ...
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0answers
33 views

Is there a solution for On-the-fly-encryption with active directory rules & policies?

I am looking at having our servers' sql databases for a few program and documents to be always encrypted on the HDD, but available to AD users. So one or multiple users with the right AD privileges ...
2
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1answer
82 views

How to send an encrypted mail only knowing the PGP fingerprint?

How does one send an encrypted email with PGP, when he only has the recipient's fingerprint? I am already sending emails using PGP, but I've just pulled a contact's PGP fingerprint who I need to ...
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2answers
215 views

Is it safe to auto-fill credit card numbers using Chrome?

Is it safe to auto fill credit card numbers using Chrome? Does it safely store the credit card information? As far as my understanding goes, it just shows asterisk values but on click it reveals the ...
2
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1answer
90 views

Is it possible to do Public Private Key Encryption on a chip (hardware)?

Does a chip exist which will take input data and output encrypted data in a public private key scheme, where the public key is on the chip and the private key is located remotely? The ultimate goal ...
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2answers
47 views

AES algorithm encryption time

What is the time taken by an AES Encryption algorithm, with a key of 128 bits, operating on a normal computer (say with Intel i7) and what will be the impact be on the time if I wish to use a 256 bit ...
2
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1answer
106 views

UEFI and security implications for encryption

After my old PC kicked the bucket I now own my first UEFI board and I am already having trust issues. I utilized Truecrypt's system encryption for years now and really got used to it. My new board has ...
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1answer
51 views

CryptoAPI to CommonCrypto with RC4

I have cryptographic code used in the Windows platform, which uses the Crypto API functions and need to convert this to using Common Crypto on OS X. Essentially the original code is this, with error ...
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0answers
42 views

Theoretical VPN and Tor Encryption Chain

Okay, so I've been looking around at the benefits of using tor to access you vpn and vice versa. Here's what I've come up with: VPN -> Tor Pros: Hides Tor usages from isp Hides your activities ...
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1answer
60 views

what is the best security application to check if someone has copied my files with a usb and how to stop that [closed]

I need an encryption application that will detect who has accessed my files from my laptop via a usb and also to help me block memory sticks to access my files and laptop without my permission.
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0answers
46 views

Encrypted Drive. Forgot password. Remember parts of it. Less than 15 characters [duplicate]

So I forgot my password to an encrypted drive (encrypted via Truecrypt 7.1a) and I remember parts of it. I know that there's "12345" in it and the entire password starts with J. how do I restore it ...
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1answer
96 views

Is it secure to not expire keys in symmetric encryption?

Note that this question describe hypothetical case, that is never meant to be used in real world. Server communicates with clients with message structure: client_id, initialization_vector, encrypted ...
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1answer
83 views

Is this process a secure way for users to login? If so, is there a name for it already?

I thought of this process specifically to stop "man in the middle" attacks and replay attacks: User types their username into the client application. Client application sends the username to the ...
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0answers
43 views

Is there an encryption scheme that allows an auditor to view some, not all data?

I want to create an online chat room allows for privacy, freedom of speech, and for law enforcement to protect citizens from violent behavior. I think the best approach is to use Shamir secret ...
3
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2answers
52 views

Saving Authentication Tokens to Third-Party Websites

So Flickr allows you to authenticate users to your app via app_key and secret and returns an authentication token. I want to securely save that authentication token in my database, but also be able to ...
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1answer
87 views

Reversing encryption by analysing executable

I have a program that reads data from a file, parses/organizes it, and spits it out as an encrypted XML. The application can also take an encrypted XML and spit out the original file. My objective at ...
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2answers
109 views

Is it possible to encrypt a download twice, once with a different encryption method?

So without giving too much away, the basics are that I have a board that needs an operating system, so I go to an IPL server to supply that operating system. I have a verifier in the middle and my ...
2
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1answer
105 views

Security of online storage of KeePass-like files

A common advice for storing passwords is to store them into an encrypted file, for example by using a dedicated software such as KeePass2. To keep this file in sync between several computers, the ...
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1answer
59 views

How to encrypt or store data so that only a pool of processes can share it on Windows?

I am writing an application T1 which is using SQLite database to store some sensitive data and i am trying to encrypt it securely. The issue i am facing is that i don't want my symmetric key to be ...
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179 views

Storing encrypted information in database vs partition encryption

Trying to search for answers like Database encryption or filesystem encryption? but did not found what I need. My database contains confidential information. What is better? To store encrypted ...
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22 views

Size of initialisation vector and plaintext in CBC mode

If I have a 16-number sequence (7,7,7,....7), and I need to encrypt this using a simple 4-bit substitution cipher, do I have to "chop" the plaintext in blocks which are of same size as the IV? In my ...
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4answers
279 views

Which strategy to encrypt data accessed by multiple users?

I need suggestions to design my database architecture (in the context of a web application) on the particular point of its encryption ; knowing that the following elements must be respected: 1- Data ...
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2answers
313 views

IPhone iOS 8.3 encryption security against physical access

Excerpt from Apple's Whitepaper "iOS Security" on Effaceable Storage: A dedicated area of NAND storage, used to store cryptographic keys, that can be addressed directly and wiped securely. ...
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34 views

Possible vulnerabilities in private chat application implemented using web broadcasting

I have never used web-sockets but I am working in a PHP framework which has builtin broadcasting facility. This broadcasting use web-sockets technologies named Redis and Pusher. The workflow of this ...
2
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1answer
40 views

Personal cipher/digest preferences ignored when generating a new key pair in GnuPG

I have specified personal digest preferences in my ~/.gnupg/gpg.conf: personal-digest-preferences SHA512 SHA256 SHA384 SHA224 SHA1 then, I have generated a new key pair. But when I check the ...
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2answers
97 views

I forgot my 7z password [closed]

I used 7zip to encrypt a 200mb archive of my code used a combination of some of 7 possible words and no numbers or caps. So 823543 possible passwords. What is the best free program I can use to ...
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49 views

encryption protection against lost password

Here is a plan I am thinking about. I haven't seen this proposed, so I thought I would ask about it. Threat we are guarding against: A lost or stolen laptop leading to exposure of sensitive ...
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1answer
67 views

Is DNS secure when using DNS crypt?

Is it the same security level like a VPN DNS wise when using Open DNS crypt servers plus DNS crypt proxy? I installed both packages in Ubuntu and now unless I have the right IP entry in the network ...
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1answer
37 views

Detect if AES and hmac keys are invalid

I have a server which has a configured value of AES and HMAC key. The client also should have the same keys. When the client sends a request, the server interprets this request and reads the message. ...
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6answers
2k views

Why do we keep our keys secret, rather than our algorithms? [duplicate]

On almost any website that relates information about cryptography in general there is this common notion that almost all encryption/decryption algorithms should use a key as one of their inputs. The ...
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1answer
45 views

Is it possible to make a different encryption for a phone communication?

I wanted to know if maybe it's possible to make a phone communication more secure than the current A5/1 (used for GSM). Or maybe create a special tunnel between two phones. I mean like an ssh ...
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1answer
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Does Server Mistrust improve security? [closed]

By server mistrust, I mean the fully implemented lack of customer plaintext on a vendor's system, and lack of vendor access to customer plaintext. Specific case in question: Password and SSH key ...
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62 views

Ensure that a file can only be decrypted after a specific condition is not present

Are there any cryptographic schemes/protocols that would allow me to encrypt a file, make it publicly available, but ensure that it can only be decrypted when a specific condition is not present (I ...
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3answers
182 views

Is it possible to encrypt an SD card?

In the film "Citizen 4", it's said that we cannot encrypt an SD card. Do you know why it would not be possible?
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1answer
108 views

How can I recover my encrypted data from a Sandisk Secure Access [closed]

I had saved my all important and personal data on sandisk secure access 2.0 on 16gb pen drive cruzer but after 1.5 month when I connect my pen drive to the system, it asked me to generate new ...
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0answers
58 views

How to decrypt a file only if specific conditions are not met [closed]

I know how to decrypt a file after one or more specific environnemental conditions are met (with secure triggers). I am interested in a cryptographic sheme that would enable decryption of data only ...
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1answer
39 views

Passing data among 3 parties with public key encryption

There are three parties involved in a repeated data transfer process: Client C, Broker B and Provider P. There might be multiple clients C. Broker B manages P's customer database. Each customer has a ...
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72 views

Could other people steal my Internet connection if they had my PPPoE data?

Would it be possible for other people to use my PPPoE data to get Internet access or is it somehow restricted to my house? Then what about my neighbors downstairs, could they do it? And what about ...
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1answer
84 views

Is SQL Server 2016's Deterministic Encryption any good?

I'm seeing that MS just released a new version of SQL Server which supports deterministically encrypting a column, so that you can still query it: ...
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0answers
48 views

How can I use session salt for encrypting data using AES in CTR mode?

I have to implement a crypto-plugin in Java. The approach followed is conceptually similar to that used for SRTP. The algorithm used for data confidentiality is AES in CTR mode (I'm following a ...
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28 views

What type of security does Gazzang zNcrypt provide?

We have just planned to implement the same in our organization, and I believe this will encrypt files and data on disk. I have two questions: Does it provide column level encryption in database (if ...
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1answer
48 views

Can DUKPT BDK be 192 bits?

All examples seem to be with 128 bits. Can it be 192 bits?
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2answers
60 views

secure notebook options [closed]

How can I secure my notebook with highly sensitive information stored in a spreadsheet. I am keeping the following options in mind: Password protect & encrypt BIOS Full disk encryption Password ...
1
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1answer
69 views

Sketchy traffic from port 3030?

I am running tests on a server that is ran by a close family friend, who agreed to allow me to do so in exchange for the experience I will gather (I am currently a computer science student). On ...