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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Do I need to use GPG subkeys for my backups?

I'm reading a lot about the need to separate the master key from additional encrypting or signing keys, like these links: GPG subkey layout. Separate keys for C, S and E? ...
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0answers
58 views

Is it possible for an attacker to log keystrokes of a bluetooth or wireless keyboard [duplicate]

Bluetooth and wireless keyboards are sending keystrokes wirelessly. Could this mean that an attacker (or spy) can log the keystrokes by monitoring the wireless or Bluetooth radio waves (or whatever)? ...
0
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1answer
73 views

Is a password-protected excel file considered secure versus encrypted file or email

I understand that encryption is the highest form of security for document/data storage. While a password-protected document is more secure than one without password protection, if the document is ...
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1answer
31 views

Can a 3rd party validate the origin of an HTTPS session?

I'm wondering if HTTPS can be used as proof that a server reported an answer. If I understand correctly, the initial handshake is for HTTPS is the only time that the public/private key of the server ...
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2answers
94 views

How do data breaches of account login information end up in plaintext?

For example, see this story. Am I missing something here? Are the login details actually still encrypted? I don't understand how it is possible for a data breach of what I assume is encrypted ...
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0answers
20 views

Should RSA primes p and q should differ in length by “a few digits”? [migrated]

When generating RSA keys in the original RSA paper it is stated: "to gain additional protection against sophisticated factoring algorithms, p and q should differ in length by a few digits" Why is ...
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1answer
36 views

Unsecure FTP with Encrypted file and Wireshark leakage

Hi i was wandering if it is possible to have a password leaked to an encrypted file on an anon ftp server with r-x-w permissions. So for example i have a file encrypted using gpg and when opened on ...
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6answers
2k views

How to prevent illegal file transfer or copying of video files from a PC? [closed]

I have developed a windows desktop application using VB.NET. My applications main purpose is to play videos. I have some videos which has copyrights on them, that are not suppose to be distributed or ...
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5answers
2k views

Why does IV not need to be secret in AES CBC encryption?

According to Wikipedia, the initialization vector (IV) does not have to be secret, when using the CBC mode of operation. Here is the schema of CBC encryption (also from Wikipedia): What if I ...
3
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2answers
82 views

Does TLS rotate the shared secret periodically?

After the initial shared secret is agreed upon between the client an server through the TLS handshake does the shared secret get rotated periodically ?
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0answers
62 views

Android Rooting and Evil Maid Attacks

I'm trying to learn more about full disk encryption (in the context of a Linux based server) and what schemes offer true security and which only offer the illusion of security. As I understand it, ...
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2answers
54 views

Replacing files with infected files on anonymous ftp server

I am creating a new question as i now have another question which was raised from a previous answered question post. What im trying to figure out is would this scenario be possible. I have an ...
2
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1answer
79 views

Is storing passwords encrypted with GnuPGP on an anonymous FTP server safe?

I would like some advice on a method of storing passwords to a database on my anonymous FTP server. Basically I have login details for a few trusted users to a database server stored in a text file ...
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0answers
3 views

Why ecryptfs still remain in mtab? [migrated]

I use ecryptfs for encrypted lxc container container start ok and stop ok But i see even after stop this line /var/container-lxc/face/rootfs.crypt on /var/container-lxc/face/rootfs type ecryptfs ...
8
votes
4answers
558 views

Can governments intercept end-to-end encrypted Whatsapp communication through lawful interception?

Since Whatapp started end-to-end encryption with an option for users to verify keys, many government security agencies, like the Indian one, red-flagged such use of encryption. Now, Yesterday the ...
1
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1answer
69 views

What is the best practice to secure an unattended Raspberry Pi?

I'm working on a project which involves mounting a Raspberry Pi on a self-moving vehicle. I'm looking for the best way to encrypt the Pi (entire file-system, swap, etc.), with the minimum possible ...
3
votes
1answer
112 views

Is there readily available encryption algorithms for current computers, that is safe from quantum computers?

Is there readily available encryption algorithms for current computers, that is safe from quantum computers? I know a bunch of currently popular encryption algorithms that are safe from current ...
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0answers
29 views

SQLCipher and PRAGMA key on iOS

I'm a bit confused as to how SQLCipher handles the PRAGMA key provided for encrypting the SQLite database For background: I'm looking at options for encrypting application data at rest. From the ...
7
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3answers
1k views

What are the disadvantages of using public key cryptography when encrypting files? [duplicate]

I am wanting to encrypt a file with my public key, my friend told me that this is not a good idea but did not explain why. Can someone explain please.
1
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1answer
96 views

Should the RTP feed from a surveillance camera be protected?

I see a lot of camera system and they're either using RSTP over RTP or just RTP. Most of the times they are on straight HTTP for the login, some will be on HTTPS, but unless forced (which I have ...
4
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1answer
50 views

Transport Layer Encryption vs. Application Layer Encryption

Can anyone tell me the key differences between Transport layer encryption and Application layer encryption and outline example use cases where each are most appropriate? The research I have done so ...
0
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1answer
56 views

Samsung SSD 840/850 EVO with DiskCryptor?

Samsung's 840/850 EVO SSDs have hardware full disk encryption feature, however the stock disk management app (Magician) only mentions BitLocker's support. Encrypted Drive feature provided by ...
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0answers
73 views

Is this cascading encryption, and is my security weakened as a result?

I'm trying to understand what is, and what is not, considered cascading encryption. All of the posts and conversations I've read over the past few days discourage the practice, including this article. ...
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0answers
12 views

How can you figure out which encryption was used just by looking at the data? [duplicate]

I have 1500 lines, which were encrypted (by a random encryption method) and then encoded using base64. Let's say I can easily write code to decode the base64 strings. After that I get the encrypted ...
2
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2answers
111 views

How does an encryption master key work

Apparently the 'secure' cloud-encryption service BoxCryptor supports master keys for encrypted files. Decrypt every file which is accessible by any member of your organisation. How would a ...
3
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1answer
75 views

Security of cellular-connected devices

The EFF Secure Messaging Scorecard lists a number of apps that meet all of its security criteria. So assuming that end-to-end encryption is accessible for the majority of people in countries in which ...
3
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1answer
140 views

How is encryption different for Windows yet they are identical?

I right clicked on C:\Users\USERNAME and did advanced -> enable encryption. On one laptop it turned green. The other it shows an icon on the files with a lock. What is the difference between these? ...
2
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2answers
87 views

How to know when an OpenSSH rekey occured, and how to trigger one?

I have a twofold question about OpenSSH rekeying. I use OpenSSH 6.4 on the server side and the connection between client and server is a SSH2 connection. The questions: How do I know when a rekey ...
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1answer
76 views

What is AES 256 bit encryption? [closed]

I was looking through some apps to store my passwords in on the App Store when I found one that boasted an "AES 256 bit encryption system". Now that sounds all very good and well, but that doesn't ...
5
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3answers
65 views

Asymmetric encryption and signature performed by hand

There are some methods of encryption so easy that you can do them be hand, but is there an easy(ish) method of private & public cryptography and signing that a human can perform it by hand? The ...
3
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1answer
131 views

Authenticate tracking device with TCP server

I am building a tracking device and am looking for a secure authentication method to use when the device wants to establish a connection to the server. The server is a TCP server that we open a ...
2
votes
1answer
52 views

Is EFS FINRA and SEC Acceptable

I'm trying to search in their manual but there is nothing explicit being mentioned as to what type and how encryption should be done. Can I assume that if I use EFS on the entire USER directory that ...
0
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1answer
25 views

Hashing and signing partial data in payload

I'm hashing and signing part of a payload prior to HTTP Posting from a mobile device to server side. The payload contains of about 7 data elements and only 3 of them are hashed/signed using a private ...
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1answer
118 views

CRC-96(ZIP) decryption

Is there a way to decrypt CRC-96 encrypted string? I am testing a web application which stores the password in the database in CRC-96 encrypted format.
0
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1answer
157 views

How does the Signal Protocol, used by WhatAapp, work?

I want to understand the process of the Signal Protocol. I have google it, but I am unable to find any good article or tutorial. I want to understand the basic definition and functionality of the ...
1
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1answer
93 views

AES step by step

I can't seem to find an AES tutorial that starts from Unicode to Cipher text. All of the tutorials I found starts with 128 bit block already. Also, where do I start or what topics do I have to start ...
1
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1answer
59 views

Client-side encryption using public-key

My situation: Login password from a POST request is left in browser memory in clear text as long as cache is not cleared (manually/closing browser). Connection is HTTPS. Possible Solution: ...
3
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2answers
136 views

How difficult is it to brute-force Windows EFS encryption?

With EFS I have C:\$USER\ encrypted so all files owned and used by said user are encrypted. If this laptop is stolen, am I correct that they could pull the microsoft user password hashes, crack ...
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0answers
11 views

USB memory stick automatic encryption [migrated]

Is there any commercially available USB drive (memory stick) that will automatically encrypt any file(s) copied to the drive, without needing to install or execute special software on the connected ...
0
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1answer
28 views

AES-CTR with PBKDF2 for IV for file archiving at server. Is this ok?

I have tried to grasp enough of encryption/hashing to be able to implement a secure storage for files, server side. Once I have it down to reasonably safe I'll go over it with an expert. There is no ...
0
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1answer
69 views

What's Google Inbox request/response obfuscation skill? [closed]

I Inspected Google Inbox network resources via Chrome Developer Tool. I saw some request/response payload and result. This object type is not readable for human. I've never seen this kind of ...
5
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3answers
122 views

Encrypt Items With Single Key or Use KDF+Salt To Encrypt Each Item?

I'm currently planning the development of a system where extremely sensitive information for individual users would be stored. There are currently two approaches being discussed. In order to make it ...
1
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0answers
31 views

Client Side Encryption (CSE) across multiple clients

Working on 2 layer security in the cloud (AWS). Have multiple clients pushing files to S3 document storage which are then retrieved by one EC2 instance. Multiple external customers each requiring ...
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0answers
81 views

Should I blur the cached snapshot of my app?

I recently ran a security scan on one of my iOS apps that suggested I modify my apps display as it enters the background so that the screenshot stored in the cache does not expose any sensitive data. ...
0
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1answer
95 views

Is it possible to to encrypt multiple messages with multiple keys and get only one cipher?

I want to have cipher which when people decrypt it with their own key, get different meaningful messages. Is this possible at all?
6
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1answer
250 views

Are RSA Key Pairs unique?

I generate RSA key pairs mostly using the following command: ssh-keygen -t rsa -b 4096 -C "someemail@hostname.com" which produces a public-private RSA key pair. If I run this command again and ...
1
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0answers
55 views

Key Hierarchy and key Encryption

If i have two 56-bit DES keys, and I use these two key to encrypt a 256-bit AES key. Like this: K_AT encrypts K_BT and K_BT encrypts K What is the effective security of key K? Is it 2 X 56 Bits?
1
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2answers
74 views

Is it possible to find the salt?

I have this PHP code with me : $auth = md5($username.$password.$salt); I have a dummy value : $username = user $password = password And I also have the resulting MD5 Hash : ...
0
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0answers
13 views

Does windows still use it's software based user keys when TPM-based EFS is enabled?

I have an infineon TPM installed, with ownership taken, and EFS enabled with the TPM taking control of EFS for me. I do know that regular EFS uses the windows user cryptography/login password to ...
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0answers
70 views

For multiple clients it's better symmetric or assymetric encryption?

I'm a newbie in the encryption world so I'm here for asking which is the best solution between Symmetric and Asymmetric encryption. In our use cases, we have multiple clients that must be ...