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
61 views

How is PKI used to encrypt an e-mail for multiple recipients?

My understanding is that when an e-mail is encrypted and sent to a recipient, the recipient's public key is used to encrypt the e-mail, and then only the recipient can decrypt it with their private ...
2
votes
1answer
37 views

What security layers of protection are available over XMPP?

I have been working on an application running over XMPP. I would like to know which all popular security layers are available over the XMPP protocol, similar to SSL over http.
14
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3answers
856 views

start point into cryptography and encryption [closed]

Recently I am growing passion for security/encryption/cryptography. I follow some famous people in this domain on twitter and read articles over the web. However, this topic seems deep and every time ...
1
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1answer
66 views

encryption of Google's android apps

Does Google use encryption on it's Android apps like Gmail, drive, Google Play, docs, others in authentication and transit? What the type of encryption is it? Is it secure? I have tried searching ...
0
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1answer
45 views

Indexing encrypted data for efficient searching

I have implemented encryption for certain columns in a database. In some cases it may be necessary to search by these columns, either for exact matches or for substrings. At the moment, there is less ...
0
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2answers
57 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
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1answer
84 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 ...
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votes
1answer
101 views

How secure are encrypted USB sticks really? [closed]

So I have read some articles (this being one https://nakedsecurity.sophos.com/2010/01/05/flash-drive-manufacturers-warn-hackers-decrypt-secure-usb-sticks/) that point out some flaws with certain ...
1
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1answer
43 views

LUKs Header Backup Security

It seems that one of the weak points in LUKs encryption is that the LUKs header can be a single point of failure if you do not create a backup header for it. My question is: What methods of securing ...
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1answer
41 views

Is digested password safer than salted password?

which scheme is the better one in your opinion? I know that both are secure but which is better one? I know that digested passwords are very difficult or even impossible to decrypt. Thanks for your ...
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0answers
10 views

I want to implement EAP TLS based authentication in my Java project how can I implement ? is there any API available in Java for using that protocol? [migrated]

I want to implement EAP TLS based authentication in my Java project how can I implement ? is there any API available in Java for using that protocol ?It will be great help for any reference .
2
votes
1answer
78 views

Wrapping my head around Protonmail

I've been trying to grasp how Protonmail could work. From what it gather, it works like this: When you signup, you create an account password and a mailbox password. A PGP private/public key pair is ...
0
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1answer
73 views

Thunderbird password decryption from the signons.sqlite and keys3.db without using any third party tools

I understand from the Mozilla documentations that the passwords are stored in the following two files which are located at ~/.thunderbird/*.default location: ( I use Ubuntu 13.10) signons.sqlite ...
3
votes
1answer
174 views

Prevent BEAST attack without RC4 cipher suites

It is common practice to prevent the BEAST attack using the following ciphers in Apache SSL configuration: SSLCipherSuite RC4-SHA:HIGH:!ADH Unfortunately, RC4 has been found to be flawed and it is ...
0
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1answer
47 views

Bridge mode question [closed]

İ have an outdoor in my shop and distributing my network to customers using mac filtering opition.. one of my neighboor got a weak signal....so, he bought a wirelss repeater to recieve a better ...
0
votes
2answers
122 views

How do security agencies share their data with each other? [closed]

I am trying to develop an application for some hypothetical security agencies for sharing their data with each other for a college project.I have three questions, 1.How do security agencies share ...
0
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2answers
98 views

Are there any good tools to test the encryption quality of data?

I am trying to increase my understanding of data encryption, and I was wondering this. It would be really nice if there were any good tools to test how secure my encrypted data is, for example how ...
2
votes
1answer
76 views

Any ways to protect my user data on company computers?

I have a desktop computer at work running Windows 8.1 Pro. For logging in I use a domain account and I have logged in with my Microsoft account to get access to my Onedrive and syncing of email ...
0
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4answers
156 views

How safe is it to use older/unknown Encryption methods for plaintext?

When mailing or chatting with people, it had crossed my mind, what if, for simple communication, someone would use an older encryption method (i.e., ENIGMA), to encrypt their message? Would because ...
0
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0answers
14 views

Security in MPI implementations

I came across a research paper andproject discussing about the implementation of encryption/decryption in the channel layer of MPICH2 called the ES-MPICH2 library ...
0
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2answers
86 views

Trust level of whole disk encryption software

For example, if we take this software into account: Symantec Endpoint Encryption Sophos Safeguard Encryption How can we trust suppliers of whole disk encryption software in the lights of the ...
35
votes
5answers
3k views

Pattern to allow multiple persons to decrypt a document, without sharing the encryption key?

Current setup We have a service that allows users to upload documents through a website and stores the uploaded documents encrypted on disk. The documents on disk are encrypted with a per-user key, ...
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votes
1answer
119 views

What kind of encryption is this? [closed]

I'm trying to discover what type of encryption was used to generate this strings: Qo94v0JpPaL59LS6U3xfEB4nVgc= +3ZaEliGZ7DWte+LaviHvOlcg9A= v44x/KnS/JyOVDtbmbkFkJEgkWs= y75nHoG/yXwutlixBX7/jRXsv+o= ...
1
vote
1answer
79 views

Client Hello message suggests cipher suite which is not in the list specified by setEnabledCipherSuites() method

In my code, I use JSSE6 API to specify a list of enabled cipher suites. I aimed to only allow 168 bits or higher encryption cipher suites, below is a part of my code: /** List of 168 bits encryption ...
0
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1answer
104 views

Why is not safe to use the same public key in RSA?

In the RSA context, why is not safe to use the same n (public key)for different people?
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2answers
88 views

Find DES encryption key having input and encrypted output

Having the source string: S3nh4#1 And the generated encrypted string: csf7259aT07Rw Using this script, it identified the algorithm used to encrypt as DES(Unix) I wonder if it is possible (in ...
1
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1answer
66 views

How to cryptoanalyze a one time pad that uses a plain text document as the pad?

I have read that in order for a one time pad to be truly secure, the pad itself must be random data. Given the practical difficulty of sharing a secure random pad, I was wondering what would be the ...
2
votes
1answer
43 views

ecryptfs - relationship between passphrase and sig-cache.txt

I have previously used TrueCrypt for creating encrypted directories on servers. I am now trying ecryptfs due to the end of development announcement in May. I see that when I encrypt a directory and ...
5
votes
2answers
683 views

Can the IV + Salt be the same?

During my encryption app i've got the password creation bit: PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, keyLength); and later on the actual encryption part: ...
0
votes
2answers
258 views

Difference Between MD4 and MD5 encryption

During coding, I have used both MD4 and MD5 encryption techniques. But there hasn't been any noticeable security difference between either of them. And yet, most of them prefer MD5, in fact specify ...
3
votes
1answer
64 views

Session Management for Private Key Passphrases in a Web Application

Use Case I would like to encrypt data in a database for a Web Application. The following requirements exist: Decryption should only be possible when a user provides a passphrase Encryption should ...
0
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2answers
35 views

encryption using two keys

The use case is analogous to accessing a safe box in a bank. There is a per-user key, unique for each user, either generated by the system or hashed from the user's password. And there is a ...
3
votes
1answer
138 views

Using Facebook via Tor

I think about using Tor for nearly everthing, including Facebook, because FB often tags the users even on other sites, for example per Like-Button, Cookies etc. Now I think about using the Tor ...
2
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2answers
83 views

Encrypted container on top of a copy-on-write filesystem

The way I understand it, when you write to a copy-on-write filesystem, data never gets overwritten in place, instead new data is written to a new location, and the old data will only be overwritten ...
1
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1answer
98 views

All users can write only one can read system

The system I want to implement has the following requirement: All users can insert some sensitive data, but only one, master user, can see it. There is any known, already implemented solution to this ...
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2answers
113 views

Is using TrueCrypt in OSX secure? [duplicate]

What would be a more secure way to encrypt files using TrueCrypt 7.1a. The is an airgapped computer (wifi, bluetooth, speakers and mic removed too). The encrypted files will be on an external drive in ...
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0answers
28 views

Review of the “Connections Tab” in my browser using secured sites

Can someone help me understand the following information better when looking at a secured site in my browser. For example I'm looking at a site now and it says the following in the connections tab ...
0
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1answer
279 views

Wifi Educational Hacking - Aircrack-ng wpa vs wpa-psk

I have a question about the max amount of dictionaries need to crack a wpa2 or wpa2-psk password I am using aircrack-ng on ubuntu Is there any possible way to calculate the maximum amount of ...
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votes
0answers
38 views

Data protection on DVD's

I would like to encrypt data on a dvd such that one can read but not write the dvd. Ive tried Nero 15 but it requires that I send a public key to the user which I find counter-productive. Any ideas
3
votes
1answer
76 views

Encryption and HMAC with the same password

I need to send authenticated ciphered messages by using a single password. Reusing the same (derived) key for the block cipher and the HMAC is not a good practice, I know. My initial idea is to ...
3
votes
1answer
81 views

How to best to secure data over HTTPS

My aim is to have an (iOS) app in which the user would login, then on sucsessful login, gain access to additional information over an encrypted webservice (undecided). From research, I understanding ...
3
votes
1answer
94 views

Is it a good idea to do double AES encryption with 2 different keys, when one is held by the user and one stored on the server?

I'm building a web app. The app needs to keep certain data within the database very secure. Please assume for the moment that I don't have a HSM or Key-Management facility and can't afford to ...
1
vote
0answers
42 views

SSL Asymmetric encryption newbie [duplicate]

I am relatively new to the world of cryptography and was wanting to develop a webpage which allows credit card payments. Thus, I looked into the digicert ssl service, hoping that it could do what I ...
2
votes
2answers
109 views

Does client side encryption really add security?

A lot of password managers seems to promote client-side encryption as a key feature of their service. For example : LastPass, Firefox Sync, PasswordBox, etc... They all say something like Even we ...
0
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0answers
19 views

Infer encoding mechanism from n-grams distance

I have a series of obfuscated strings which across the set of strings have regions of high variance and regions of low variance (implying some encoding mechanism as opposed to an encryption procedure ...
2
votes
2answers
78 views

TLS reliance on System Time

I'm interested to know if there is any reliance on system time (as defined by Linux or windows) when initiating a secure handshake. I'm aware that TCP typically uses a random number (RFC 1323) to ...
2
votes
1answer
82 views

How does Putty derive the encryption key in its .ppk format?

I have been doing some reading on the mechanics of managing RSA key pairs, during which I learned that OpenSSL by default derives the encryption key by using MD5 on the passphrase (bad!) without any ...
0
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2answers
86 views

Should I use HMAC in this situation

I need to store a big message encrypted on a server. What I am about to do is: Encrypt the message with a AES key; (Authentication) Hash the message with SHA512 and encrypt the hash with RSA priv ...
1
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4answers
160 views

Is 3DES outdated for message authentication code computing?

I am working in IT department of a bank, currently we use 3DES to compute MAC of packet, is that safe enough using 3DES? Should we use any other more modern algorithm?
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0answers
51 views

Encryption algorithm keySize restriction in JSSE 7

I have an application which uses SSL (JSSE Implementation). Currently from my client side, the "Client Hello" message suggests a list of cipher suites that consists of both 128 & 256 bits key ...