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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Cryptography and key exchange [duplicate]

Can someone please explain the Diffie-Hellman key exchange for me. I have been studying it but I don't actually get the concept
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2answers
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How is WhatsApp sending end-to-end encrypted messages in push notifications?

WhatsApp implemented end-to-end encryption (whitepaper) in their latest update. How is it possible for WhatsApp to send push notifications with message contents to the Apple Push Notification service?...
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Migration problem between different machines using TrouSerS TPM library

My question coincides with the question posted by Maximiliano Ezequiel. Below is a question. I could make migration process work in one single machine. I can: Export SRK public key. ...
21
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1answer
937 views

Linux, TRESOR and XTS

I want to switch from using LUKS for full disk encryption to TRESOR. TRESOR tries to prevent cold boot attacks by storing the encryption key in the CPU's registers. It uses the kernel's crypto API for ...
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1answer
214 views

How to disable weak cipher suits in java application server for ssl

I have a custom Java application server running. I am seeing that there are some weak cipher suites supported by the server, for example some 112-bit ciphers. I want to disable those. Where can I do ...
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1answer
78 views

BBM pin to pin security

If a BBM message is intercepted over unsecure Wi-Fi and the PIN of the intended recepient is known. Can it be decrypted easily.
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4answers
306 views

Avoiding direct object references

Say I wanted to avoid exposing a database primary key in a URL; somehow I must encrypt the key, so that the url only exposes elements of an unenumerable cipherspace. What kind of encryption should I ...
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1answer
4k views

Which Cryptography algorithm is used in WhatsApp end-to-end security?

I have a presentation to make on Social Network Security. I have been doing some research regarding this. I did a lot of searching, but was unable to find the Crypto Algorithm used by WhatsApp for ...
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2answers
412 views

What data is not encrypted in iOS 8+ when “locked”

Scenario: iPhone 5+ with iOS 8+ with system encryption enabled. The phone is on and locked. (the user has authenticated (unlocked phone) at least once since power-up, and then relocked). What data/...
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1answer
43 views

Getting file from Amazon s3 encrypted based on user

I am storing my files on Amazon S3. My problem is that whenever a user asks for a file I want to generate an encryption key (user specific key) and encrypt the file and send it to him. So basically I ...
3
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1answer
75 views

Is having a unique key to encrypt data not sufficient

Is it necessary to use a unique Initialization Vector (IV) with various cipher modes of operation (e.g. CBC) even though I use a unique key to encrypt plain text every time? It is said that an IV ...
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1answer
93 views

Does non-persistent data ever need to be encrypted?

Does non-persistent data ever need to be encrypted? If I had a project with confidential data stored in non-persistent class variables should I be doing anything to protect this data? I am developing ...
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2answers
115 views

Is it more secure to delete emails from the server once a client has downloaded them?

From this email provider We strongly adivse people to download their email whenever possible, so as to lessen the amount of personal private data present at any time on the servers. Does ...
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1answer
252 views

Why is whatsapp Inc. still caching user data even after introducing the end to end encryption?

Last week Whatsapp introduced the end to end encryption to prevent man in the middle intercept/attack. The company claims that the data such as text, call, video, images and documents are stored ...
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0answers
62 views

Data recovery from BitLocker encrypted device that has been quick-formatted

I apologize if this is in the wrong place, but I couldn't find anywhere else that seemed appropriate for these questions. My classmate has a 512GB USB drive that he had formatted as exFAT and ...
9
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3answers
408 views

Linux Plausibly Deniable File System

Is there any way to encrypt a linux filesystem in such a way to maintain plausible deniability? E.g. "Hidden OS support," the way Truecrypt and Veracrypt work, they only support Windows OS due to low ...
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2answers
844 views

How secure is AES-256-CBC with user provided password and initialization vector

From my understanding the IV is used as a previous block for the first block only. But since each block is used by the following this adds significant security is a IV is provided and not based on the ...
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2answers
101 views

Idea for an encrypted pastebin NON-web application

I have an idea for an app that might be useful (though if it isn't, I've still learned in the process, which is what matters). There are a bunch of encrypted pastebin web apps out there (e.g. defuse....
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1answer
164 views

Open source WhatsApp client [closed]

As a follow up to Whatsapp encryption keys discussion and from WhatsApp security whitepaper, it seems that most of the components to a fully secure end-to-end encryption are already there but what ...
5
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1answer
204 views

Was TRESOR integrated in the Linux kernel?

If a computer is switched off, the data can stay in RAM memory for a while; decaying over about 5 minutes. This can be made longer by cooling the chips: https://citp.princeton.edu/research/memory/...
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1answer
66 views

Hide data from user, but process it in application

Is there a way to hide the data that's received somehow from the user? In particular, I have some data that gets send from a webserver to an application. I want the application to process the data, ...
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2answers
175 views

Server full disk encryption protection from malware

A group of LINUX servers is using dm-crypt to encrypt data. The servers do not store data long-term but are only temporary stopping points for data before it is sent to other systems. The time the ...
3
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1answer
70 views

Is this good/secure method for client-server communication encryption?

Something came to my mind, and I wonder if this is proper method for client-server communication, and if this method is wide-used. On connection, client generates seed, encrypts it using asymmetric ...
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1answer
505 views

How would one verify that the public key from WhatsApp's servers belongs to the person I expect it to?

WhatsApp had recently announced end-to-end encryption on all communications. While that's an impressive move, I still have a big open question mark. The articles and this white paper suggest that the ...
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2answers
494 views

How does WhatsApp's new group chat protocol work and what security properties does it have?

By now everybody has noticed that WhatsApp rolled out full end-to-end encryption recently, for direct communication, for media attachments and for group chats. I've read their white-paper (PDF) and ...
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2answers
839 views

WhatsApp end-to-end encryption verification [closed]

IS there any way to verify the encryption from remote or so? Like my friend is 1000 miles away from me the physically QR Code scanning is not possible. So is there any way to verify the same?
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1answer
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End-to-end WhatsApp vs Telegram [closed]

What do you think about the latest WhatsApp update? Is now WhatsApp as secure as Telegram? Which one should be trusted? Which one has the strongest and most secure encryption?
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1answer
46 views

Break encryption by applying accidental-overwrite techniques

I read that there are ways, at least on mechanical drives, to sometimes recover data that was overwritten (not just deleted). Now I was wondering if it was theoretically possible to break a fresh ...
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1answer
201 views

Network Security with EAP: PEAP and Phase 2: MSCHAPv2?

I want to connect to my college WiFi but I’m worried about the security (data leakage, hacks, MITM). The configuration I used to connect to my college WiFi is as follows, EAP: PEAP Phase 2: MSCHAPv2 ...
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0answers
151 views

WhatsApp end-to-end encryption for all devices [closed]

The news is out, WhatsApp switched on encryption for a billion people. It supports all devices and encrypts texts, photos, videos and calls. There are so many questions that just came to my mind ...
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2answers
3k views

How to check if a transaction on a web connection is encrypted

Someone just asked me: How can I know whether a message or data is encrypted during a transaction on trading website? I know most (maybe all) online trading sites uses encryption techniques ...
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5answers
10k views

SQL field level encryption, how safe is it?

I am considering encrypting my database and/or encrypting only certain columns in a few tables. Is it worth the time? I mean, how much of a burden would it be on someone if they were to get a hold of ...
3
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1answer
63 views

Is appending plaintext to salt equally safe as appending salt to plaintext

Is using hash(salt, plaintext) equally secure as using hash(plaintext, salt), i.e. can the plain text be appended to salt in place of appending salt to the plain text. Why or Why not? What kind of ...
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2answers
133 views

How can I extract the encrypted master key from LUKS header?

I know that a LUKS partition has a plain-text header that stores many informations like master key (MK) digest, MK iterations of PBKDF2, information about the 8 key-slots etc. I also know that in the ...
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1answer
117 views

Method for securely removing files from a solid state drive

I've thought of a method for securely erasing single files on a solid state drive. This method will work only if the drive is encrypted, and it will work even if someone cracks the encryption key for ...
4
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2answers
108 views

Does EMV protect against sniffing PAN data from untrusted network?

I have received conflicting information in regards to the security of PAN data on the wire. Can this be sniffed with properly configured EMV at an atm? To quote from the link below: http://www....
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2answers
159 views

Does TLS authentication encrypt username as well as password?

I connect to my VPN provider using openVPN. The server uses a combination of username / password and TLS authentication. If I am on a public wifi and connecting to my VPN, is my username encrypted? ...
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1answer
76 views

Stronger Password-based File Encryption on OS X [closed]

I am wondering if there are any better alternatives than the zip command on the OS X terminal. My intention is to add a password to a compressed file. I have been using: zip -j -e -pMY_SECRET test....
2
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2answers
193 views

Is the RSA private key useless without the password?

I notice whenever I generate a new gpg key (using pgp) I always have to assign a password to it, which makes perfect sense. But if I'm not mistaken, gpg is based on prime numbers. How is this ...
2
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2answers
52 views

Tails, relay nodes tracking

When I open "network map" on Tails, I see a list of IP addresses with locations. What are these? And it's titled "Relay". Does the government have access to all relay nodes on the TOR network as they ...
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2answers
183 views

Hashed master password and generated encryption key in a password manager program

I'm writing a WPF password manager application to practice programming, so far this is the scheme I intend to use to store master password and individual site password: Master password: Generate a ...
14
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4answers
2k views

Is it possible to prevent a physical attack on full disk encryption?

I've been researching into some methods to ensure that disk encryption keys can't be stolen, and one that I've come across is called TRESOR. With this kernel patch, you can create a partition that is ...
0
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1answer
49 views

Encrypt existing SSH key

I've created an RSA keypair for ssh access to a remote server. This all works. When creating the keypair, I didn't enter a password. Now I would like to encrypt the key, secure it with a password. Is ...
3
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5answers
620 views

Why can passwords be used to encrypt data, but are less strong for authentication?

Encryption software is often password based. Even if the adversary gets your computer they can't get the data without knowing the password, and bruteforcing is infeasible. Websites use passwords to ...
0
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1answer
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Why is calculating the checksum of an IP Datagram header and then encrypting it not appropriate to provide Data Origin Authentication?

So assuming Alice and Bob have agreed to use a particular symmetric cryptosystem and share an appropriate key, they want to achieve data origin authentication by computing the header checksum of an IP ...
6
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3answers
181 views

Android full disk encryption

I am using Android 4.4.4. There is an option called phone storage encryption. From what I have read the crypto is secure. However, I read this article which said Google is able to reset passwords: ...
2
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2answers
76 views

How does GnuPG encrypt secret keys?

When creating a secret key with GnuPG, you are asked for a password to protect it. Which encryption algorithm is used to achieve this? The handbook only says that a symmetric encryption algorithm is ...
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1answer
86 views

Public key encryption for initial challenge-repsonse

I understand public key encryption, public key authentication, how digital signatures work and challenge-response authentication, but what confuses me is when they are all combined, and the question ...
4
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2answers
60 views

How to check and trust call encryption software

There are lots of software for mobile operating systems providing end-to-end encryption. What is the best way to decide which one is trustworthy if their source is not revealed? Reverse engineering ...
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2answers
664 views

Replay attacks and PGP email encryption

From my understanding of PGP email, the following is possible: Alice sends a message to Bob. Then Bob can take that exact same message and send to Carol while making it seem to Carol like it is from ...