Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

learn more… | top users | synonyms

0
votes
2answers
43 views

Is there a secret-sharing public-key-encryption-based service? [on hold]

I need to share some sensitive information with someone else who can only communicate via E-mail. I don't love the idea of sharing this information freely over email in plain text, so I was ...
1
vote
2answers
86 views

Will an IP packet to the own IP address ever leave the computer?

I am working on a system that consists of several applicaitons communicating with each other. Some of these applications will run on the same server and some will run on a different one. So there is ...
1
vote
3answers
60 views

How can DH provide a known secret to two parties over an unencrypted connection without it being intercepted via MITM?

Without using Private and Public keypairs, i do not understand how Diffie-Hellman is able to generate a secret key between two parties on the internet without passing something between that could be ...
0
votes
0answers
24 views

HTTP vs. HTTPS- detailed procedure to implement HTTPS [migrated]

I have a third party system deployed on Apache web server and Jbose application server, but no SSL implemented. Please tell me the detail procedure on how can I implement the HTTPS feature on my ...
1
vote
2answers
91 views

Can ISP use MITM attack to “break” encrypted traffic?

Use connection of A and B as an example. Their communications were encrypted by Public Key Encryption. Before they exchange their public key, ISP MITM attacked. A got "B"'s public key (ISP generated) ...
0
votes
2answers
29 views

Is server-side access control sufficient or should I encrypt querystrings

I've got an ASP Classic system that passes around sequential ids corresponding to keys in the database. I had gotten an encryption module (chilkat, an activex control) that I was using to encrypt and ...
4
votes
1answer
82 views

Is a Linux environment PCI compliant if the swap file is not encrypted and PANs are loaded into RAM?

Is a Linux environment PCI compliant if the swap partition/file is not encrypted and PANs are loaded into RAM by an application?
0
votes
1answer
41 views

A folder lock/encryption program that can do this? [on hold]

I am looking for a program that can lock or encrypt folder, but in case if my laptop is stolen and C drive is reformatted and reinstalled, and i have locked folders on D drive, these folders to remain ...
0
votes
1answer
33 views

XTS vs AES-CBC with ESSIV for file-based filesystem encryption

In a blog post I recently read called "You Don't Want XTS," the author explains some of the pitfalls of using XTS to encrypt filesystems. Specifically, he recommends against ever sharing encrypted ...
23
votes
2answers
3k views

Break the popularity contest crypto

There is a very interesting puzzle on the Programming Puzzles and Code Golf site to Rearrange pixels in an image so it can't be recognized and then get it back. I understand that this is not ...
2
votes
3answers
63 views

VPS Privacy: OpenVZ vs KVM vs Xen

Considering OpenVZ, KVM and Xen: Which VM technology is the most difficult for the host's administrators to access given an encrypted root partition? Can I have a reasonable expectation that rogue ...
0
votes
0answers
14 views

user defined counter increment function for blowfish CTR in java [migrated]

We did some research but couldn't find the answer. The javax crypto blowfish counter increment function seems to be fixed ( standard inc by 1? ). How to change the increment function, say by 4? Or ...
0
votes
2answers
108 views

Hacking machines using internet packets [on hold]

I have a friend (X) who hacked the whatsapp account of someone (Y) using iphone. He told me that he sent a packet to the iphone of Y that appears as a normal whatsapp message but now he can see all ...
0
votes
1answer
30 views

PCI compliant transparent data encryption at disk/folder level on windows?

Is there a way to achieve pci compliant data encryption at disk/folder level in windows in a way that is transparent to applications(they must be able to write/read to encrypted folders/disks as if ...
0
votes
2answers
69 views

Encryption mechanism

I want to send data over the Internet securely. For that, I am using an public key of the receiver to encrypt the data. In this case, if an intruder in the network modifies the data, like placing the ...
1
vote
2answers
73 views

Database compromised and some passwords cracked

I run an MMORPG game and today while moving from one server to another, apache failed and listed some of the data on the server including a back-up of all the source code + database which a few people ...
1
vote
1answer
25 views

Importance of password strength with secure element?

Greetings SE security community. Background: I have a number of items like certificates, databases, and encrypted file systems that require private keys. In order to avoid having duplicates of these ...
0
votes
1answer
23 views

How is the Premaster secret used in TLS generated?

I believe that it uses some combination of the random values sent in the hello messages. From RFC 2246: (TLSv1.0) RSA encrypted premaster secret message Meaning of this message: If RSA is ...
1
vote
2answers
40 views

pci compliance and temporary files

Does storing temporarily a non-encrypted file containing some PANs violate pci requirements? (for example because it is being processed by an application, or to open it on a file editor)
-1
votes
1answer
52 views

PHP/Ajax Data transmission security

I'm learning about web security mechanisms. I have developed the following system in PHP and JavaScript: assuming that I have a page named: messages.php which is a real-time chat system. first when ...
0
votes
2answers
65 views

How to generate a superkey to decrypt strings

I'm working on an application where users have a key or password generated by me that is used to encrypt a string. Each user has their personal key, and no user should be able to decrypt another ...
0
votes
1answer
28 views

Can any ECC field element be safely serialized as “compressed” and then restored as uncompressed?

I have a library that stores all its ECC Field Elements in uncompressed form, in a bloated Base64 XML format, and storage has become a concern. (We want to support QR code as a form factor,etc) ...
4
votes
2answers
118 views

Safety of using online proxy?

Lets say for example I have to use a public online proxy like https://www.zend2.com to load a php webpage controlled by me containing sensitive data over https. How would i make sure that the proxy ...
0
votes
1answer
37 views

GPG encryption and signing

Why don't the commands gpg2 --armor --sign file.txt and gpg2 --clearsign file.txt have the same output? Also when I use just --sign I get a bunch of binary gibberish surrounding the message in ...
1
vote
7answers
163 views

What are the benefits of encryption for everyday people?

In addition to the fact that encryption systems like PGP are notoriously difficult to use, and that encryption doesn't always jive with cloud-based services like webmail, the fact is that most people ...
0
votes
1answer
53 views

What Linux software can I use to explore entropy of a file?

I've heard of tools that could be used to graph entropy of a file. Is there a graphical Linux program that I could use for this job that would let me conveniently explore which blocks of a file have ...
0
votes
1answer
33 views

Identifying stream cipher algorithm based on encrypted content

Is it possible to identify the algorithm used for the stream cipher based upon analysis of an encrypted stream?
2
votes
1answer
53 views

Would it be possible to add additional files to a password protected zip 2.0 file

So the scenario is this: I don't have the ability to determine/recover the master password for a production system that uses zip 2 archives. However, I need to be able to add new files to existing ...
0
votes
0answers
9 views

How to store hexencoded ciphertext in Java [migrated]

I am tasked with finding the secret message and I believe that I will have to XOR the different ciphertexts, but I don't understand how to store a ciphertext in a variable in Java. I could not find ...
0
votes
1answer
22 views

In TLS1.2 AES-GCM mode, what happened when input is not exactly the multiple of its block size?

I know that AES-GCM mode does not need padding, and its output are exactly the length of input data plus the tagging. But I am a little bit lost, as AES itself is block cipher, it could only operate ...
0
votes
1answer
59 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.
0
votes
1answer
50 views

Using ECC like RSA, to Encrypt/Decrypt

Is there any way to implement encryption/decryption using ECC, like RSA does? For example, say some user wants to send a message containing a symmetric key to user X. Then, in RSA, I could just ...
1
vote
0answers
68 views

Traveling abroad with encryption software on my computer [closed]

I have software installed on my computer that has encryption capabilities. This is the case both for things like VPN/SSL, and also GPG. I don't really use GPG (there are not that many people I can use ...
0
votes
0answers
32 views

Sector of small data encryption and transmission

I'm not sure my question is right for this site but still, since its information security so here it goes, I really want to know is there any sector of data encryption that allows or deals with very ...
-1
votes
0answers
11 views

how to devise a packet into different blog to encrypt by AES

i need to encrypt a packet about 1024byte but my code can only encrypt 16byte. i wanna know how to devise it into several parts to encrypt by AES. and i wanna the answer can be used in C language...
1
vote
6answers
759 views

Is it theoretically possible to decrypt a file without the key/password?

Hear me out ... On TV shows like Criminal Minds they make it out to appear that any encrypted files can be easily decrypted, even without a key. The character, Garcia, just simply "pushes some ...
0
votes
2answers
58 views

Are files hosted on cloud servers/websites/databases manually checked by people?

I was wondering ... when I upload a file to, say, Dropbox, does anybody personally check it to see what it is? Say I upload a copy of my Blu-ray movie to cloud storage ... will anyone check, and ...
0
votes
1answer
41 views

What is the strategy used by the itunes store and Google Play to protect and securely install applications on eligible devices?

The requirements for a system like itunes store or google play are as follows; identify and authenticate the user determine if the user has paid for a given app if s/he has, securely transmit the ...
2
votes
1answer
79 views

Properties of AES Encryption

First of all, I apologize if these questions can be answered using a web search, but I'm sort of a crypto noob and don't know what to search for. Given N AES encrypted messages (where the message ...
0
votes
1answer
68 views

How to store a hexadecimal string representation in C++ for use in cryptography

Homework question The full question is the following: Suppose you are told that the one time pad encryption of the message "attack at dawn" is 09e1c5f70a65ac519458e7e53f36 (the plaintext letters are ...
3
votes
1answer
103 views

Encrypting data within SQLite database in JAVA - How to store key?

So, a bit of context before I start may be handy. I am developing a JAVA desktop application which will use an SQLite database to store/process data. The application will utilize authentication to ...
3
votes
1answer
130 views

How to decrypt a file when I have its key?

How could I decrypt a file (encrypted with AES-128) using openssl ? I do not remember the passphrase I used to encrypt it, but I saved the key generated and used to encrypt my file. How could I use ...
65
votes
5answers
6k views

How can my employer be a man-in-the-middle when I connect to Gmail? [duplicate]

I'm trying to understand SSL/TLS. What follows are a description of a scenario and a few assumptions which I hope you can confirm or refute. Question How can my employer be a man-in-the-middle when ...
2
votes
0answers
39 views

How to identify an encryption algorithm [duplicate]

I have found a small encryption in a programm and would like to identify it, in terms of the public name. I have been programming with a DES and with TEA, but what i have here is not even similar with ...
1
vote
0answers
15 views

PBKDF2 hashing over TLS for encrptig password [closed]

i wanna use PBKDF2 hashing over TLS for encrypting password and session and that way stop hackers from breaking into my connection. How to do it in java.
4
votes
1answer
133 views

Why run ondemand scanners in failsafe mode when the virus could have encrypted itself?

The internet is full of guides of how to remove malware on already infected computers. Normally, step 1 is to enter failsafe mode, so that the virus can't interfere with the anti-virus program that ...
13
votes
3answers
2k views

Is amazon S3 secure enough to hold personal documents?

I have a client who is looking to hold personal information such as Driving Licences and Insurance documents in order to verify if a user of the site is who they say they are and lives where they say ...
1
vote
2answers
240 views

What's the point of the nonce in CTR mode?

Does having a nonce in CTR mode actually improve security (vs. just using 1, 2, 3, etc. - basically a constant nonce of 0)? As far as I can tell, the best-case scenario security-wise is that the ...
1
vote
1answer
74 views

How do web email clients store my passwords from other providers?

The situation comes down to this: When I enter in hotmail, it retrieves my messages connecting to other providers: they could only do so by using my email and password. Since I had signed in a ...
1
vote
2answers
145 views

This protocol is vulnerable, but why?

I know that the following authentication protocol is vulnerable, but I can't understand why. A and B share a secret key K (64 bits) R1 and R2 are two 64 bit numbers A-->B: I am A B-->A: R1 ...