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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1answer
37 views

Best practice of deprecating old OpenPGP subkeys when migrating to a new subkey pair?

I've been using GnuPG with an offline master + online subkey setup for a while now. All my email is signed with the signing-only subkey and encryption is done with the encryption-only subkey. The ...
0
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2answers
78 views

Can I VPN a phone's connection to my home network, and then apply my home firewall to my phones network connections?

I have a decent firewall/router at home, and I was wondering whether it would be possible to use my home firewall for the connections that my phone makes, even when I'm not at home. It would mean ...
-1
votes
2answers
82 views

How is encryption broken [duplicate]

The title describes pretty well what I want to ask, because I just can't wrap my head around it. I understand the basics of breaking encrypted data with the method of kind-of-bruteforcing where you ...
-6
votes
1answer
67 views

What encryption is this? [closed]

7c4a8d09ca3762af61e59520943dc26494f8941b This is 123456, I don't know what kind of encryption it is and all the passwords are saving as it in my database so i need to know
3
votes
1answer
72 views

Why is plain dm-crypt only recommended for experts?

I am curious about the following claim from the Cryptsetup FAQ: 2.4 What is the difference between "plain" and LUKS format? First, unless you happen to understand the cryptographic background ...
2
votes
2answers
137 views

Save application autostart login token on computer

I need to login desktop application while autostart on server (like skype does). What is the best practice to save authentication token (password)? Should I use something like RSA encryption (which ...
-1
votes
0answers
15 views

Would BitLocker and SysKey be a possible and good security combo? [migrated]

Is it possible to have Bitlocker and SysKey work together on a Windows machine? If so, could you have them both work on a single USB thumb drive? Would the Thumb Drive have to be partitioned? If no, ...
0
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2answers
24 views

Advantages of Enabling Firmware Password Protection

What security advantages, if any, would be gained by enabling Firmware Password Protection on a mac that allready has filevault encryption for the disk?
1
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0answers
56 views

If someone hacks our server, how can we prevent them from decrypting data stored in Vault?

I have been tasked with evaluating Vault in our company and the first question asked by an architect was: If someone hacks our server, how can we prevent them from decrypting data stored in Vault? ...
3
votes
3answers
96 views

Authenticity of PDF document printed from Word

My MS Word Add-In generates PDF preview of DOCX file on client PC and uploads both files to server. I cannot generate PDF on server. Is there any way to make sure that the PDF is the printed version ...
35
votes
8answers
4k views

Is full disk encryption on a server in a secure data center pointless?

I am having a debate with several people regarding how much protection full disk encryption provides. dm-crypt is being used to encrypt data which is required by my company to be encrypted at rest. ...
39
votes
7answers
8k views

Why isn't open WiFi encrypted?

As far as I understand, WiFi networks that require no password send traffic through the air unencrypted. Those that require a password encrypt each connection uniquely, even if they're all using the ...
-1
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4answers
127 views

What mail applications use crypto?

I just read that everyone in the world can ready my mails (if intercepted in traffic by eavesdropping?). Also, it reads that current versions (book's from 2004 so I assume that new versions adopt ...
0
votes
1answer
67 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 ...
6
votes
0answers
61 views

How to make sure that the cryptographic hardware accelerator is being used in am335x?

I want use the AES hardware accelerator in am335x. I was able to generate the cryptodev.ko and cryptosoft.ko. From my application program I am making use of openssl apis in CBC mode. I wanted to ...
0
votes
4answers
308 views

Is end to end email encryption possible without unique domain/subdomain for each user?

Lets say Alice@gmail.com wants to send message to Bob@secureMail.com Alice <--> gmail.com <--> secureMail.com <--> Bob We know gmail.com can read the unencrypted message. Is it possible for ...
2
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5answers
3k views

Does the padlock on my browser really indicate a reasonable assurance against eavesdropping?

I know that there have been broken or weak SSL implementations. Do browsers actually have decent standards for what they'll accept and display "the padlock"? Furthermore, are there any practical ...
3
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1answer
2k 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.
3
votes
2answers
168 views

RSA public key and private key lengths

I'm having a problem understanding the size of an RSA public key and its private key pair. I saw different key sizes for RSA algorithm (512, 1024,... for example), but is this the length of public ...
2
votes
3answers
4k views

Is Aescrypt a valid tool for encryption or not?

I'd like to know if Aescrypt is a valid tool, or if for a very secure protection, the only choice is to use a software like gpg, or similar. More I've another curiosity, if one doesn't want to use ...
30
votes
4answers
15k 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 ...
0
votes
1answer
35 views

SQL Server Format-Preserving encryption

I have old system with database that has table with column of type char(20) and the customer decided to encrypt that column for some business needs however for some system integration needs the ...
3
votes
0answers
47 views

How to encrypt and authenticate large amounts of data with NaCl

In a current project the NaCl-library crypto_box function has been used to encode and crypto_box_open to authenticate and decode data. However the library does not seem to support de- / encoding of ...
1
vote
1answer
63 views

Security concerns of browser injected JS

To employ end-to-end encryption, I am using a small tool that encrypts contents that is then posted and stored on our servers. While there are several concerns on client based encryption, I think it ...
19
votes
2answers
41k views

Security comparsion of 3DES and AES

Which one is more secure and least possible to be broken through cryptanalysis AES or 3DES (no matter performance)? I need to use encryption for my projects to store and secure sensitive information ...
2
votes
2answers
110 views

Are hashes of hashes used for password storage in practice? Why/why not? [duplicate]

A naive developers might store a password in the database directly, which would then be compared directly with the password sent from a client. A more security conscious developer might instead store ...
10
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5answers
14k views

What does “key with length of x bits” mean?

I'd like to know what it means to say "the cryptosystem C uses keys with a length of x bits". I do not understand what the bits length means... doesn't it depend on the encoding? The same word encodes ...
63
votes
14answers
9k views

Ensure that a file can only be decrypted after a specific date

Are there any cryptographic schemes/protocols that would allow me to encrypt a file, make it publicly available, but ensure that it can only be decrypted after specific date? I assume it would be ...
3
votes
1answer
53 views

Is it safer to store valuable information on a unsecure client or send the data through the internet?

Background: I'm creating a secure web app with the purpose to act as a no-knowledge storage for small data (we're talking a few bytes). Since all the encryption and decryption happens client-side, ...
14
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1answer
2k views

PayPal encrypted with obsolete cryptography

My Chrome just complained from PayPal's security, similarly to this issue: Google Chrome "Your connection to website is encrypted with obsolete cryptography" The identity is verified, but ...
15
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2answers
2k views

Does AES-192 provide better encryption than AES-256?

this wikipedia article describing AES says: Related-key attacks can break AES-192 and AES-256 with complexities 2^176 and 2^99.5, respectively. Does this mean that AES-256 is actually a weaker ...
1
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0answers
48 views

What is the difference between XOR and poly-XOR? [closed]

What is the difference between XOR and poly-XOR in encryption?
3
votes
3answers
119 views

How do I deal with browsers complaining that my MediaWiki website has unsecure resources? [closed]

I recently bought a subscription to a NameCheap shared hosting plan, and I plan to primarily run MediaWiki on it. I've managed to setup everything fine except for the SSL encryption. When I visit my ...
1
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2answers
131 views

Securing user's data against an attacker that may gain server root

I'm designing a web application that is going to handle very sensitive data, storing it on behalf of its users. A kind of online safe, if you will. A user's secure data should only be visible to her, ...
1
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1answer
1k views

Using AES as a Stream Cipher

I need to send a lot of small messages that are usually between 128 bits and 256 bits long, and each message is encrypted with a separate 128 bit AES key. Therefore, to send each message with the key ...
12
votes
8answers
50k views

How can I determine the encryption strength of an SSL connection

If I've connected to a https url, how can I determine the cipher strength of the connection? My understanding is that after the asymmetric public-key handshake the information is encrypted using a ...
-1
votes
1answer
102 views

Cryptowall encryption files

This is a question concerning the way the Cryptowall ransomware encrypts files on the victim's computer. Someone knows if it is possible to recover the encryption key comparing the encrypted file and ...
2
votes
1answer
218 views

Is this a sensible way to encrypt user data?

I want to make a site for storing sensitive user data, that retains per-user data encryption in the event that the database is compromised. This is the model I was thinking of, to give the best ...
1
vote
1answer
8k views

Encrypting string in JavaScript and decryption in Java [closed]

I would like to know if there is any library to do encryption in JavaScript and decryption in Java. I have already tried many APIs, but am not getting the same values in Java. I want public-private ...
-2
votes
1answer
83 views

What is encryption by RSA with AES? [duplicate]

By visiting some websites, like bank websites, we can see for example: TLS_DHE_RSA_WITH_AES_128_CBS_SHA, 128 bits, TLS 1.0 I would like to know: What does mean CBC? TLS 1.0 is an old version, is ...
2
votes
0answers
95 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: ...
111
votes
2answers
72k views

What is the difference between https://google.com and https://encrypted.google.com?

Is it there any difference between the encrypted Google search (at https://encrypted.google.com) and the ordinary HTTPS Google search (at https://google.com)? In terms of security what were the ...
1
vote
1answer
217 views

Chat encryption system avoiding protocol sniffing and then key+decryption replay?

I'm working on a chat system and I want to add it some kind of security (not just HTTPS with SSL since I've read it can be sniffed and decrypted with a few tools). Now, my knowledge in cryptography is ...
1
vote
1answer
91 views

Secure socket communication between iOS device and 3rd party server

I'd like your advice on what is the best approach for the challenge in my hands... I'm developing an extension to a 3rd party software. I'm doing my development using Python/Twisted/Autobahn. The end ...
0
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0answers
45 views

Designing a security system for road pricing

It's my first semester with Information Security and I still feel a little lost. Sorry in advance for stupid mistakes I may have made. the examples in round brackets below are my own ideas, wrote ...
6
votes
1answer
527 views

can multiple encryption of data with multiple keys increase the security?

I mean: does encrypting data multiple times have an effect on diffusion and confusion? Does it increase security, or does it have no effect? Is it useless? Does it make it harder to break the secret, ...
1
vote
0answers
14 views

using crt for encrypting files/texts [duplicate]

I work with GPGTools under Mac where, after creating a public/private key pair for myself, I usually get .asc from other users, import it and then I'm good to go. Now, I got an actual certificate from ...
55
votes
3answers
61k views

Is Telegram secure?

There is a new WhatsApp-killer application called Telegram. They said that it's open source and that it has a more secure encryption. But they store all the messages in their servers and WhatsApp ...
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0answers
91 views

What web browsers support ECC vs DSA vs RSA for SSL/TLS?

We are updating our wildcard certificate and see that we have the option to use both RSA or DSA with Symantec (for free), while Digicert offers 3 options for wildcards ECC, DSA and RSA. Is there a ...
0
votes
1answer
136 views

Decrypting SHA-256 with known plain text

If i have a SHA-256 hash and I know what could be the crypted string is it possible to decode it faster? Lets say I know the string is formed like this : %d-%d-%d-%s %d being numbers from 1-25 %s ...