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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12
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7answers
13k views

How secure is NTFS encryption?

How secure is the data in a encrypted NTFS folder on Windows (XP, 7)? (The encryption option under file|folder -> properties -> advanced -> encrypt.) If the user uses a decent password, can this ...
1
vote
2answers
43 views

When do I use IPsec tunnel mode or transport mode?

I basically understand how tunnel mode and transport mode works, but I don't know when I should use one instead of another. Among the two parties who want to communicate, if one computer B doesn't ...
0
votes
0answers
10 views

How to securely store SSN details in a database while maintaining searches?

My question is very similar to this one, but in my situation I do not need to recover the real value. My concern with just hashing the value is that since there's a finite and (relatively) small ...
32
votes
9answers
15k views

Are powerline ethernet adapters inherently secure?

I have 2 Zyxel PLA407 powerline adapters. Router is downstairs connected to one adapter, other adapter is upstairs about 30 feet away connected to a desktop. I have a house, not an apartment or ...
0
votes
0answers
33 views

A secure way to encrypt a connection between 2 clients securing against both passive and active adversaries

Recently I got interested in encryption and the methods behind them. So for a fun / school project I am building a program in python to encrypt data between two clients (chat and files). I'm just ...
1
vote
2answers
643 views

can I trust Boxcryptor closed source software? Encryption of files for cloud hoster

Boxcryptor https://www.boxcryptor.com is not Open Source. Can I trust this? Is it secure? No government backdoor? Because there is no alternative for OS X and iOS.
26
votes
4answers
10k views

Standards for encrypting passwords in configuration files?

My workplace has a standard that plaintext passwords are not allowed in application configuration files. This makes enough sense on its face, in case someone gets access to the config files they ...
2
votes
1answer
135 views

Reverse Engineer this basic Hash using known answer?

Little background: I forgot one of my CCTV accounts password, so used the admin account to create a new one. However I can't access the old one as it's not possible to change a user account password, ...
3
votes
1answer
41 views

Decrypting arbitrary offset of encrypted file

I want to store encrypted files on some storage backend that allows me to fetch bytes X through Y of the encrypted file. I can obviously decrypt the entire file locally and send it back to the client. ...
-2
votes
0answers
25 views

KakaoTalk message encryption [on hold]

I am trying to write a tool to decode the KakaoTalk chat application and the messages are encrypted with this pretty bizarre looking base64 'Lx7ZczQJ/sdOAw8DdFcauw==', That might possibly be a base64 ...
12
votes
0answers
874 views

Why are primes important for encryption [migrated]

Why are primes so important? Why can't we just use a random number? My guess is that it's because finding a random prime require more computing power, than finding a random number. Can anybody confirm ...
-1
votes
0answers
22 views

Encryption algorithm of EScan anti-virus for data transmission between clients and server? [on hold]

I have a multi-user EScan anti-virus that uses a console to manage clients. This anti-virus has a server and receive updates from that server online, and then update its clients. The communication ...
1
vote
0answers
24 views

Password Encoding/Encryption on ODC connection Strings

I'm interested to understand how passwords provided in ODC (Office Data Connection) connection strings are encoded or encrypted. The format of the connection string is ...
58
votes
8answers
122k views

How to determine what type of encoding/encryption has been used?

Is there a way to find what type of encryption/encoding is being used? For example, I am testing a web application which stores the password in the database in an encrypted format ...
1
vote
1answer
41 views

What are the risks of encrypting a database with a single symmetric key

An application is required to store sensitive data* on each user. Additional columns are added to the database which store cyphertext encrypted on the application server. The algorithm of choice is ...
1
vote
1answer
64 views

PCI DSS - Recorded Phone Conversations

I am using the using the following image from FishNet Security as a sort of guide for the data flow diagram required by PCI DSS as defined by: 1.1.3 Current diagram that shows all cardholder ...
1
vote
1answer
74 views

Is an anonymity network like Tor viable on top of the GPG web of trust?

The web of trust is a graph where the vertices are GPG users (actually, their keys) and the edges are cross-signatures. If we put issues of owner trust aside and assume that all participants only sign ...
0
votes
1answer
94 views

Can you get someone's IP if you have their Skype number?

I was reading about capturing packets during skype sessions to get the other person's IP address... sounds like you can do this mainly while in a live skype chat / call between skype to skype, but Is ...
22
votes
6answers
3k views

What real world benefits does PGP have over sending email with SSL/TLS such as with HTTPS?

I've been learning about PGP, and I asked myself, "Why?" For example, if I'm using https://mail.google.com, then what benefit would adding PGP offer that would justify it being used? I can ...
2
votes
1answer
258 views

Requiring 2 keys to access a content

I need to use an external service that can only be accessed by password. I don't like the idea of storing the plaintext password on the server, but AFAIK there's not much I can do. Considering this ...
2
votes
2answers
63 views

Can a virtual machine be used instead of the host?

I was thinking of using a Debian guest as my main 'host' instead of my actual host (Ubuntu). Do you think this will have any advantages in terms of making it difficult for digital forensics to ...
11
votes
3answers
2k views

Using TPM with DMcrypt?

Is it possible to use TPM for storage of some private key? It's not a full-disk encryption , I want it to be compatible with existing LUKS, just add another key, and store it in the TPM.
-2
votes
0answers
19 views

how to convert mac address to floating value [migrated]

i want to change a mac address to floating point number. i tried using IEEE 754 converter online but it says "the value is out of range", how can i do it in a proper way?
24
votes
6answers
25k views

Asymmetric vs Symmetric Encryption

I am currently taking a principles of information security class. While talking about different encryption methods a large number of my classmates seem to believe that Asymmetric Encryption is better ...
3
votes
0answers
41 views

What's the best way to transform sensitive account numbers

I work on a web application that manages information about transmission setups and processes client transmission statistics to generate billing charges for the services used by these clients. The team ...
0
votes
3answers
65 views

What information can be taken by submitting an online form?

Sorry I'm pretty clueless with this stuff.. I know that vpn hides your IP address when just browsing websites, but how about submitting an online form, such as when you send an inquiry? Would my IP ...
9
votes
5answers
2k views

Whenever an unhandled exception somehow makes it into production, is it safe, viable, etc. to print an encrypted stack trace to the end user?

Whenever an unhandled exception makes it into production somehow - whatever the reason - there's generally an option (especially with .NET programs) to print out a stack trace to the end user before ...
-4
votes
2answers
136 views

Using my own encryption instead of https in app

I am writing a program that uses a webserver as a backend for communication between different users. Is it okay to use my own encryption (such as ...
2
votes
1answer
42 views

electronic voting system

Was looking at cryptocurrency and how, as a non techy, to get involved when I began thinking about the security of it being developed to undermine the stranglehold bankers have on economy and the ...
6
votes
0answers
580 views

MPPE-Send and Receive key derivation from MS-CHAPv2

I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is ...
15
votes
2answers
3k views

How does non-ephemeral Diffie-Hellman key exchange become compromised in SSL when the RSA private key is leaked?

From my understanding, one of the major reasons we recommend Diffie-Hellman Ephemeral (e.g. DHE or ECDHE) over non-ephemeral DH, for SSL / TLS, is that compromise of the RSA private key (i.e. private ...
1
vote
1answer
26 views

Necessary components for PGP

I came across this question during an interview. I was asked: What are the two main components of PGP encryption necessary for it to work? I was thinking in line of Private and Public Keys but I am ...
9
votes
2answers
8k views

Is it possible to use the aircrack-ng tool to crack a WPA2 Enterprise network?

is this tool (aircrack-ng) capable of cracking into a WPA/WPA2 Enterprise network? This tool has major success cracking the passwords of WEP/WPA networks. If it can, how, but if not, is there another ...
0
votes
3answers
107 views

Hardware encryption for Flash Drives

Could someone tell me the difference between Hardware encryption and Software encryption? (With regards to flash drives, if it makes any difference). From what I understand, software encryption is ...
0
votes
2answers
84 views

Prevent a file from being encrypted

Is it possible to prevent a file from being encrypted, or at least being easily decrypted in case of encryption? For instance; with the Crypto Locker malware attacking users, could you set up a ...
-1
votes
4answers
226 views

Creating a secure and encrypted e-mail service

Model People living in countries with totalitarian, oppressive and other threatening regimes should be able to use this system and have some degree of privacy when communicating. Objectives ...
0
votes
0answers
35 views

Suggestion of encrypt method for short fixed size result

I'm searching for a encrypt method that receives an int variable and outputs exactly 11 hexadecimal digits. I'm starting on a existing application, that already has a database of more than 130.000 ...
0
votes
1answer
72 views

How does this implementation of full disk encryption work?

I have a laptop that has Sophos Safeguard full disk encryption on it. I booted the machine into another operating system on a USB stick and attempted to read the disk from the other OS, and I verified ...
16
votes
6answers
5k views

How do I prevent copying of my PDF files?

One time while I was printing my documents at a copy center, I saw they dragged-and-dropped my PDFs from my flash drive to their desktop. How do I protect my files without using password? Is there a ...
0
votes
1answer
58 views

Is digital certificate with 'issued to' field as *.example.com valid?

Came across a Digital Certificate which has issued to field *.example.com Is this a valid certificate?
20
votes
1answer
14k views

What key exchange mechanism should be used in TLS?

There are many key exchange mechanisms that can be used in TLS. Among them are RSA, ECDH_ECDSA, ECDHE_ECDSA, ECDH_RSA, ECDHE_RSA and others. Which of these are more cryptographically secure and can be ...
1
vote
1answer
118 views

Protecting decryption key on server

What is the most suitable way to encrypt and decrypt sensitive data on a public cloud server disk without storing the decryption key on the server in plaintext? REQUIREMENTS In our SaaS web/mobile ...
2
votes
1answer
48 views

Long passwords and key derivation functions

Not being a security expert, I have a rather theoratical question that I have been thinking about for quite a while now: Let's imagine an encryption software that takes a user-provided password, ...
9
votes
2answers
752 views

Timing attack against HMAC in authenticated encryption?

In an answer to another question of mine, it was noted that a class using standard string comparison functions when checking the HMAC in authenticated encryption would make the class vulnerable to ...
0
votes
2answers
289 views

Metadata-free Email: How can SENDER directly, anonymously, and securely ask RECIPIENT’s mail provider to deliver a metadata-free email?

If I want to send emails to friends who use Google, Yahoo, AOL, etc., how can I currently use my local email client to send a metadata-free* email to them? E.g., is it possible to bypass my own mail ...
29
votes
5answers
51k views
1
vote
0answers
11 views

Decrypting a Windows MIG file [migrated]

I was wondering if anyone has any experience with decrypting an MIG file created by Windows 7 easy transfer. We have a client that has 15 years of genetic research and never wrote down her password ...
4
votes
1answer
177 views

How To Encrypt Group Emails?

I'm interested in encrypting e-mails. My very, very basic understanding is that I am to generate a private key, and share my public key with the message recipient (who will share his public key with ...
0
votes
2answers
75 views

Key Management/storage system

In my firm we have a couple of thousand hardware devices, installed externally, that all send back data to a central server. They send back data about every hour. Each of these hardware devices ...
1
vote
2answers
150 views

What are methods to protecting an android phone from law enforcement

From what I hear, android uses the standard linux dm-crypt for encryption. Obviously you should have: A pin/password for your phone That pin/password should at least be 8 characters The question ...