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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How can I encrypt in the column level of SQL for numeric data

I want to encryption in the column level of SQL for numeric data.What should I do?Is there an algorithm for this? Where should I put the function of encrypting in the source code?
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How Does AES Encryption Work?

I'm looking for conceptual but semi-detailed step by step explanation of the AES encryption process, from plain text to encrypted text. The explanation should assume knowledge of basic programming ...
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1answer
33 views

Do we need to same PGP version for decryption [on hold]

Requirement: In our company Location A uses PGP encryption and sending data over internet. In Location B, we have to decrypt the file. Question is what do we require in Location B Do we need to ...
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1answer
37 views

Retrieve anonymous credentials

Background A registration process to acquire an anonymous, verified account goes like this: Registrant provides proof of individuality to a Registrar. Registrar verifies proof, ensures no prior ...
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0answers
11 views

generating public/private credentials for MS Outlook email encryption [migrated]

An app running on a CentOS 7 web server needs to receive encrypted emails sent from users of MS Outlook. Can someone please provide explicit instructions as to how I can generate or procure all of ...
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1answer
24 views

P12 private key vs private key file : what is more secure?

The question is a bit tricky because they don't have the same purpose but : Do both kind of file face the same security issue concerning private key protection : password strenght ? (PBKDF2 as both ...
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2answers
59 views

Are there any known weaknesses with ElGamal algorithm?

I am working on a messaging system and plan to use ElGamal asymmetric encryption to protect the message contents during storage and transmission. (This would be in addition to TLS used during ...
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3answers
95 views

Acceptably secure solution for users to log in with a short unique code only (no username)

I am creating a website whereby users are given an account by invitation only, and are sent a unique code by post. Users can then log in (at least the first time) by entering the code only. The goal ...
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0answers
13 views

How should an ISP approach Mutual Auth TLS for SMTP email? (Domain Auth Email)

I'm looking for an easy to deploy way to make email clients (MUAs) display my email messages in a secure manner. PGP and SMIME both do this today, but they are high touch, and require software or ...
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What is encrypted in this image? [migrated]

In the image above apparently has a hidden link?? I don't know how to do this (even if it may seem simple for some) however I don't believe it's anything malicious. It's a part of a puzzle, but ...
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0answers
21 views

block cipher and stream cipher [on hold]

what is differance betwwen stream cipher and block cipher?As in block cipher data are in chucks while in stream cipher bit by bit encrypting so how many data are as input in stream cipher?
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1answer
79 views

How cryptographic hardware accelerator is secure?

I am using cryptographic hardware accelerator of am335x. As per documentation it unloads the cryptographic operations from the main CPU and hence increases the performance. But from the security point ...
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0answers
31 views

Using OpenSSL to generate encryption key for Outlook users [migrated]

A private web application needs to receive encrypted email from perhaps 20 known users. How can I use OpenSSL to generate a valid encryption certificate that Outlook users can import and use to ...
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51 views

Server side encryption [on hold]

In my research work i used only server side encryption of data and my external examiner asked that why I used RSA algorithm for encryption on only server-side and not client side so i am confused for ...
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3answers
167 views

Calculate time taken to break AES key

A 256 bit AES key is required to be broken using the brute force method on a 2GHz computer. How long would it take to break the key in the best case and in the worst case situations? Assume that 1000 ...
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1answer
69 views

Do IVs need to be unpredictable?

I am encrypting a sequence of messages with AES/CTR. For each sequence, I generate a random initial IV, say IV(0). Define IV(i) = MD5(IV(i - 1)) for i = 1, ..., n. Then for each message m(i), I ...
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1answer
54 views

Is TLS enough to prevent eavesdropping? [duplicate]

Is it enough to use only SSL/TLS for client-server application with authentication, registration and data transmission (like chat)? If it is not what I also need to use?
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1answer
33 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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0answers
34 views

Android 5 encryption

There's been lots of talk about the allegedly improved encryption in Android 5. Some questions about this: What is the maximum length for passphrases? (i.e. is it still limited to 16 characters?) ...
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0answers
22 views

authentication token not stored in DB

I am implementing a webserver and the guideline I am following suggests: - to create token by a Serializer that takes the IdUser, a symmetric key and an expiry date - provide it to the user but not ...
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1answer
180 views

SIM card - Cryptography

I would like to have general infos about crypto and commom SIM card in mobile phone(I know there may be different implementations, technos according to the operator...). Is crypto used only for ...
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0answers
3 views

Unable to log into encrypted root drive after running virtual machine [migrated]

I am unable to log into my encrypted hard drive on the host which is Ubuntu 14.04 LTS desktop. This all happened after I did the following. Ran VirtualBox Created a VDI drive Installed Kali Linux ...
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26 views

How can i know my security level as “ SSL 256 bit encryption” [duplicate]

I am using openssl tool to create certificate self-signed certificate I have known that [2048 bit SSL] it is the length of the public key then what about [256 bit encryption] how can i know type of ...
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16 views

VPS cloud data security encryption [closed]

I have a vps for personal projects, holding a blog , notes , some test applications Some of the notes etc have personal info. I have configured apache-ssl with snake-oil for transit. Should I do ...
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1answer
76 views

Perfectly secure Postfix MTA (SMTP) configuration

I want to secure my root server (further) service by service, starting with the SMTP service (Postfix MTA) as the most busy one. I the course of setting everything up, I read a lot about security and ...
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1answer
50 views

If a company outsources storage of private data in plaintext form, is this considered a data disclosure? [closed]

SCENARIO: A company that handles private/confidential data (such as personal health information, etc.) wishes to outsource storage of its data to a public cloud storage provider, such as Dropbox or ...
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1answer
51 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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2answers
47 views

Client side encryption with sustainability as a service

I only need 2 things. 1) The user to know that only him (not even then admins) can decrypt his data that rely on my server. He will always provide his key to decrypt data. 2) To be able to provide ...
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1answer
50 views

Why should I have my GPG key expire? [duplicate]

When creating a key pair using gpg it asks me for an expiration date: $ gpg --gen-key Please specify how long the key should be valid. 0 = key does not expire <n> = key expires ...
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1answer
43 views

Is it necessary to encrypt nonce in cryptographic communication?

Server and client have a pre-shared key K. Assuming that that pre-shared key is safe, so nobody other than server/client can encrypt/decrypt. Client sends a nonce N to server, server then sends back ...
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4answers
88 views

Which is more effective and 'secure': Compression+Encryption, or only Encryption?

This came up in an IRC discussion on freenode, and now I"m curious. The idea is that someone wants to determine whether or not encryption alone, or compression+encryption (with gpg/pgp being the ...
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0answers
63 views

Is it possible to trick a CA into signing a certificate by intercepting on SSL domain validation email?

From my understanding domain validation certificate are verified by receiving an email on some special email addresses on the domain (e.g. postmaster@example.com, admin@example.com) or by sending on ...
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63 views

Questions about SRP algorithm

I trying to use SRP algorithm but I have some questions: Is that a good choice to use for registration and authorization SRP algorithm with SSL/TLS? And for all other transmission using just ...
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0answers
49 views

Store 2-legged one-time password's key securely

I have a system with a OTP authentication and I need a method to encrypt the main "secret algorithm". In my system each OTP has a pair named "solution" and it is also changing like the OTP. I need to ...
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2answers
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Encrypting short data with RSA only?

I have a case where I need to create recovery accounts and I want to create them so that nobody knows the password to them until/unless necessary. Hence, I thought that I would do it using RSA - when ...
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0answers
58 views

Brute-forcing a RSA private key password vs. LUKS volume

I need to store various private keys for my clients. Given these options, what would be the least prone to brute force attacks: Encrypt the private keys using a separate RSA key (each user get its ...
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1answer
33 views

How are various softwares' files/information kept safe from me, the user. [closed]

I started making a simple user authentication program just for fun, and I realised I don't know how to keep safe the files that will store all the usernames and passwords. This got me thinking. What ...
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1answer
70 views

In PSK TLS, how is the key used for encryption derived?

I'm trying to decrypt a message sent over a secure communication channel using TLS_PSK_WITH_3DES_EDE_CBC_SHA. I now have the client random number, server random number, PSK identity and PSK value. My ...
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1answer
40 views

What does a FIPS validation certificate cover? Just software version or OS and hardware too?

As I understand it, if you want to be FIPS-compliant you have to use FIPS-certified components. My question is how different can your use of the component by from what's on the component's validation ...
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3answers
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Mitigating the LUKS decryption key residing in RAM for FDE

I've come to find Full Disk Encryption to be a rather unsafe method of securing data as standardized tools are becoming available to just read out the encryption key from RAM, where the system needs ...
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2answers
100 views

Why use anything other than RSA for transmission encryption?

Being fairly new to the cryptography and data security space, I have sampled a few "Introduction to cryptography" sites/textbooks and they all seem to start in the same general way: This is a Caesar ...
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7answers
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Can you say that since one time pad encryption is unbreakable, it is the best if used properly?

I'm currently reading about one time pad encryption, and I have a question. They say OTP encryption is unbreakable, and this can be proved mathematically. This is provided that the key used is truly ...
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2answers
105 views

Roommate Frequently Hacked — How Do I Protect My Network/Devices?

If you absolutely had to share a network with a user who had a very lax approach to security and was frequently hacked (1-2x month for over a year now), what might you consider doing to secure your ...
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2answers
76 views

Determine if compressed or encrypted [closed]

I have a bunch of network data and I would like to determine if it is either 1) encrypted or 2) compressed. I doubt it is both, but the potential exists. If I am assuming that the traditional ...
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1answer
58 views

Default Encryption - A Panacea or Placebo

I wrote this on LinkedIn - Discrete Discretion My first question is: Is it accurate to say that default encryption is a placebo? Will default decryption only make end-users think they are secure ...
2
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2answers
69 views

How can I create my own public certificate using openssl?

I have a public key/private key pair i generated using two primes p and q. I now need to use openssl to sign and create the certificate. I heard req utility and wrote this from the man pages. openssl ...
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2answers
53 views

What type of encoding do .pem files use to store the key?

What encoding is the modulus in RSA cryptography stored as in a .pem file? Is it something similar to base64 of the modulus? I can retrieve the modulus using the following: openssl rsa -in ...
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3answers
128 views

How to intercept and analyze mobile SSL application traffic?

What is the best way to analyze requests sent by a mobile application over SSL? The communication protocol is not necessarily HTTP/S so intercepting them with BURP/ZAP/Fiddler or any other HTTP proxy ...
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2answers
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Hashing a password, and summing it with every byte in a file. How secure?

I have a text document with all my usernames and passwords in it sitting on my desktop. I decided to spend a couple hours making that more secure. I wrote a program for the purpose. It takes a ...
2
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2answers
77 views

RSA and AES combination in offline situation

I need to securely request and receive data from a server. The client has the RSA public key, and the server has the RSA private key. So I am generating a random key for AES-128/CBC cipher and ...