Questions tagged [encryption]

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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407 views

Can RC4 ciphers be disabled in Windows Server 2008?

Having some difficulty with disabling RC4 ciphers in Windows Server 2008 SP2. All the guidance I'm seeing for doing this is specific to Windows Server 2008 R2, including the creation of registry keys ...
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342 views

Unattended generation of “the perfect keypair”

I'm trying to generate a "perfect keypair" akin to https://linuxich.wordpress.com/short-manual-for-a-perfect-gpg-keypair-using-gpg-v2/ but I want to do it semi-automatized, in gpg2 terms that would be ...
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117 views

Does KillDisk use existing commands on a server to encrypt the data?

I've been reading up on this KillDisk exploit for Linux. https://www.bleepingcomputer.com/news/security/killdisk-ransomware-now-targets-linux-prevents-boot-up-has-faulty-encryption/ Does anyone ...
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Does using Oracle TDE guarantees compliance to HIPAA, for persisting sensitive data?

Persisting sensitive customer pharma data is becoming more challenging with stricter HIPAA compliance guidelines, wondering if TDE solves it entirely or are there any gaps that a developer/dba should ...
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477 views

Simple private AKKA encryption certs

There are several questions on stackoverflow regarding Akka, SSL and certificate management to enable secure (encrypted) peer to peer communication between Akka actors. The Akka documentation on ...
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For a web application which employs application layer encryption, is there anyway to modify post parameters which is captured encrypted in burp.?

There is client side javascript controls in place which restricts malicious characters. All form data is transmitted via POST requests. In burp, I can see that all parameters are encrypted into one ...
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114 views

Implementation of SQL “LIKE” Operator in Database Outsourcing

Recently, I read some papers about DB Outsourcing that implement aggregate functions over encrypted data. What I want to know, is there a method in DB Outsourcing to implement SQL LIKE operator that ...
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242 views

No authentication, AES encrypted JSON over UDP

I was recently assigned the task of testing a new hardware device which communicates with a JSON API over UDP. For some reason or another, it was decided that AES-CBC-128 should be used to encrypt ...
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105 views

Do different JVMS implement the same transformation differently?

I have encrypted a string - "EXAMPLE" on Oracle JDK 1.7 using the following code //ENCRYPTION of "EXAMPLE" byte[] clearText = {69, 88, 65, 77, 80, 76, 69}; KeyPair keyPair = EncodingTest....
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IPSec - Configuration best practices, performance, and realistic tradeoffs for my chosen Ciphers

I understand the term "best" is subjective but I would like to try to keep this discussion as objective as possible and get the opinion of other security professionals for my chosen cipher suite ...
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159 views

how to secure sensitive data from IT administrators?

My team is outsourcing some of its IT management, including the administrative role. Since our income is based on data we store in the DB, I would like to avoid sharing access to it with the ...
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92 views

Encrypt SQL Server traffic on a LAN

I have a .NET client application that runs on several machines on a local area network. All machines (including the server which is running MSSQL Server 2016) are running either Windows 7, 8 or 10. ...
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498 views

Encrypting OTA software updates files for embedded devices

I need to encrypt and send update files of the order of 100K from a server, through a mobile app, to low power wireless embedded devices (32 bit). The file transfers will be infrequent. The mobile ...
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464 views

Postfix + MySQL ENCRYPT() encryption method change

I already have my mail server (postfix, courier, mysql) and roundcube as my webmail client, Encrypt() is the current password encryption function, Is there a way to change the default password ...
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76 views

Key derivation usage for deep-level data storage

Let's say I have the following security scheme: Master entity | | v Group entity-----> Child entity 1 | |-----> Child entity 2 | \-----> Child entity 3 ...
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75 views

Credential transport for networked game

I'm developing a networked game, and this game will require players to authenticate to the server. The both client and server are written in Java. I'm trying to find an efficient password transmission ...
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117 views

Level of security TPM2.0

How secure is it to seal only to PCRs 0 and PCRs 2-7 with fTPM 2.0? My device does not support Intel TXT, so I am unable to extend the chain of trust to implement DRTM, and thus cannot use PCRs 17-22....
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125 views

Long-term cloud backup encryption

I have a few TiB of data on machines that I control. For georedundant backup purposes I want to also have the data in the cloud. Obviously I don't want to give the provider (or any intelligence ...
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65 views

What information can be seen when I'm using SRTP via XMPP?

Just as the title goes, basically what data/information can be tracked when using SRTP via XMPP? As client I'm using Jitsi. If things works in some aspects similar to HTTPS, I guess that maybe it ...
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787 views

How could I encrypt an SD card to store data on it?

I have some data I'd like to carry with me in an encrypted form onto an SD card, so I (and only I) can access it easily from any OS (or at least Windows, OSX and Ubuntu). My idea was like: Two ...
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83 views

Substitution Table in TKIP

In TKIP Encapsulation, we divided the per packet key mixing process into two phases. In phase 1, we are taking three inputs i.e temporal key (128-bit session key), transmitter MAC address (48 bits) ...
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140 views

Decryption with two-way authentication

We have a Customer who wants his sensitive user-data stored with an encryption. These are the basic requirements: Sensitive user-data is stored in a database using encryption A remote-attacker who ...
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1k views

Is the QUIC protocol secure?

QUIC is a new protocol for video streaming, that can establish a secure connection in one round. It is used in Google's new Duo app for example. How does it work and is it secure (comparison with TCP ...
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187 views

VPN chain in one machine without VM natively

Is it any way to make VPN chain in one machine (MAC or WIN) without VM natively (L2TP/IPsec)? I need this for obtain an extra layer of security. For example - if one VPN turns off I still have ...
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594 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 ...
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96 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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437 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. ...
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162 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?
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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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112 views

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. ...
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606 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 ...
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85 views

when/how does an encrypted volume .dmg change to reflect the file system it stores

I'm trying to verify that storing a .dmg file stays encrypted while only the mounted file system is unencrypted (see here). My thought was to create a .dmg containing a text file, make a copy of the ....
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402 views

How can I safely store a password during a user session

I am writing an Java application that is using OAuth to authentificate against a server API. The server is offering the OAuth secrets for users to copy from its website. Because each request needs ...
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94 views

Encrypted Malicious Traffic Database

I was working on a little research project to correctly identify the encrypted traffic pattern generated by various tools/applications for example metasploit (or increase the success rate). I have ...
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436 views

AES keyfile size

I would like to encrypt files using a key file instead of a password. What I would do is: 1) Generate X random bits using openssl rand X > mykey 2) openssl enc -aes-256-cbc -in secretfile -out ...
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394 views

Curve25519xsalsa20poly1305 key derivation

I'm working on batch-encryption of files, for a small project of mine. The files are stored encrypted on a removable drive, and the keys are stored on a trustful server. For enhanced safety, I'd like ...
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904 views

Best way to implement secure client/server communication in Python

For a college programming assignment I have to implement a secure communication protocol between a server and one or more clients. Upon instantiation of the server program, a file is generated, call ...
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211 views

How do ad networks and analytics providers encrypt/hash their traffic?

I am trying to observe what types of information android apps are sending to ad networks that are integrated into apps. I used Fiddler to decrypt the https traffic. However, some ad networks seem to ...
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240 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 ...
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94 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 ...
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329 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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102 views

Possible to use Cellular encryption data to validate Geolocation?

I need offline-verifiable, time stamped, GPS signals or its equivalent. Since cellular protocols include time stamps, encryption keys and other data, perhaps it's possible to re-use this ...
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77 views

Logging in from one CMS to another

Two websites with different CMS, user should type login & password on one website and needs to be logged in second website automatically. Now i have this method, it works but i want to know - is ...
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538 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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96 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?) Can ...
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70 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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179 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 SSL/TLS? ...
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141 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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131 views

Secure self-concealing symmetric encryption (non-verifiable decryption)?

From what I observed using standard encryption tools such as OpenSSH and GPG, the decryption only succeeds when the correct password/key is provided (or at most a few others, in case of collision). (...
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L2tp protocol security

do l2tp protocol is secure enough to use in unsafe home network ? protection from man in the middle ? i having a problems install openvpn in linux you think following that guide will offer me ...

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