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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Recover Deleted Encrypted File With Certificate [migrated]

I have accidentally deleted an encrypted folder and clear the recycle bin. I have the certificate of which I encrypted the folder with. Using conventional software such as Recuva, I was not allowed ...
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2answers
5k views

Is AES slower to encrypt than MD5?

Is this the right interperation of this diagram: http://www.cryptopp.com/benchmarks.html AES/CCM MiB/Second:61 Cycles Per Byte:28.6 MD5 MiB/Second:255 Cycles Per Byte:6.8 And does that ...
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1answer
39 views

Wi-Fi Protected Setup PIN method EAP Messages

Let's look at this example: router (access point) has 8-digit PIN (printed on label) and laptop wants to connect to network using WPS PIN. So user give router's PIN into laptop and laptop sends PIN to ...
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3answers
4k views

Where do I securely store application-specific symmetric key?

I am writing an application App1. This application uses SQLite database and I plan to encrypt it using AES256. For symmetric encryption I need a key, which I need to store somewhere. From a similar ...
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1answer
34 views

BBM pin to pin security

If a BBM message is intercepted over unsecure Wi-Fi and the PIN of the intended recepient is known. Can it be decrypted easily.
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2answers
4k views

Encrypted code file (.vbs) hides all my files and shows .lnk files

I am using Windows XP Professional and what happens is that when I try to connect any gadget like a pen drive or a mobile through USB, all my data gets hidden and it shows a 1 kb file which is a .lnk ...
2
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2answers
183 views

End to end security for REST services, any emerging standards?

I work with integration in the healthcare sector, where end-to-end security is important. We integrate with numerous SOAP services, and use the WS-security features to encrypt and sign requests and ...
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2answers
39 views

Guarantee one unique identity per node

I'm in the early stages of designing a decentralised systems protocol, based on a blockchain, for a thesis. For the protocol to remain secure, each node in the system must be capable of generating ...
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0answers
14 views

Is encryption with a destroyed key a good cryptographic hash function? [duplicate]

Obviously this isn't something I was going to implement, but it was a question floating at the back of my mind. So let's say that instead of hashing passwords to store in the database, you encrypt ...
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2answers
112 views

Can we store sensitive client information with the admins without them(admins) identifying it?

I am trying to design a pairing application for my university this valentine. How is it supposed to work, you ask?? The clients will submit preferences specifically names to the server and after some ...
3
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2answers
57 views

In what case should one encrypt cookies?

I am curious how one decides whether to encrypt cookies or not? And if so when should one use public private key over symmetric encryption?
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2answers
70 views

Where should I store OAuth2 access tokens?

I am building a REST API back-end, for a mobile application. In our design choice, we decided to let OAuth2 providers handle the login security. However, I am not sure what the best practice is for ...
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2answers
87 views

How to securely transfer password from a registration page to the database [duplicate]

What steps must be followed to send password securely from the user registration page (i.e. client side) to the server over a non encrypted channel (http) when the user registers for the first time ...
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0answers
10 views

Is it OK to seal data to TPM SRK directly?

In reviewing various TPM programs and libraries, I have noticed that when sealing data to the TPM, a new key is always created (wrapped by the SRK), and that new key is loaded and used in the seal ...
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1answer
99 views

Is a 43 character GPG (symmetric) passphrase as secure as a 256-bit key?

A 43 character securely randomly generated mixed case alphanumeric password (with 2 extra chars to give 64 possibilities per character) would constitute 258 bits of entropy (6 * 43 = 258). Since the ...
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1answer
31 views

Is there a 'key space' equivalent for encryption keys?

If a key space is the term given to the collection of all possible decryption keys for a given cryptosystem, then what is the collection of all possible encryption keys called?
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1answer
59 views

Covert, Overt, and side channels

I am really confused between the following three terms: Overt Channel. Covert Channel. Side-Channel. I feel frustrated! I've been searching about them to find a clear explanation but I keep ...
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1answer
33 views

Deciphering data in cloud by a specific group

I need to encrypt some data and send it to cloud to be seen by a group. I don't know how to include the group characterization to let just group's members decrypt the data. Also, I want to know how ...
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0answers
4 views

Question about Keeloq [migrated]

I have a question about Keeloq security. I have a original remote (BFT Mitto 2). I know this chip used HCS301 with Keeloq implementation. I would like to clone this remote for my girl friend because ...
27
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4answers
17k views

What steps do Gmail, Yahoo! Mail, and Hotmail take to prevent eavesdropping on email?

I would like to ask what happens when an email is sent from gmail, yahoo or hotmail public web email services? I don't understand email protocols in details, but as far as I know email traffic is ...
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1answer
159 views

SQL Server Asymmetric Encryption Keys

I have used SQL Server database with data to be encrypted and I will use symmetric key for encryption and will encrypt it by asymmetric key now comes the question how to give user permission to ...
7
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1answer
101 views

Encrypting individual files on OS X

I am about to go paperless, and I want to protect the documents that I scan. The use case is that I'll be scanning paper documents, encrypting each file, and storing them locally and on various backup ...
5
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2answers
587 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 ...
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1answer
64 views

How to encrypt/decrypt with only encryption hardware?

Alice and Bob have agreed a symmetric key to be used for encrypting messages to be sent over an insecure (wrt a passive adversary) communication channel. Both of them have hardware devices for ...
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0answers
35 views

DSS digital signing approach

Under the DSS approach to digital signing, what is the advantage of using two pairs of keys for each signature?
5
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3answers
1k views

Is ENCFS secure for encrypting Dropbox?

I've encrypted my dropbox-folder with encfs according to a few tutorials I found on the web, advocating this approach. But I've found the following critical statement concerning encfs'security in ...
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4answers
6k views

Is there an encryption algorithm that is fully secure?

Is there an encryption algorithm that is completely secure and isn't based on difficult computational algorithms? If such an algorithm exists, why we don't we use it in SSL/SSH?
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0answers
90 views

Can I make a digital time capsule? [closed]

Say I wanted to make a super awesome time capsule of some digital information. How would I encrypt it so that no one would be able to open it until a specified date? (E.g. 100 years from now.) At ...
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1answer
26 views

Secure Electronic Transaction (SET Protocol)

I've looked into the SET protocol and some of the information are outdated. Therefore, I would like to ask if the SET protocol uses 3DES or AES or just the DES and the RSA?
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0answers
15 views

Is cryptsetup luksFormat -y --cipher aes-xts-plain --key-size 512 /dev/sdax a insecure setup for luks [duplicate]

Is cryptsetup luksFormat -y --cipher aes-xts-plain --key-size 512 /dev/sdax insecure. If so why and what setup would be good for keeping corporate information safe?
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0answers
50 views

how to decrypt it on RSA encrypted message? [closed]

You must decrypt the following RSA encrypted message, the thing is you only got public key :/ which is as following ...
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1answer
38 views

Timing side-channel attack example

I understand that timing side-channel attack is a measurement of time taken to execute cryptographic algorithms. I'd like to see a simple example that explains how timing attack takes a place on any ...
1
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1answer
23 views

Stateless AEAD (AES-GCM) based tokens

I want to generate secure data tokens which can be shared with the client for uses like password reset, etc. which involves low storage overhead at server end. Ideally I am interested only in managing ...
1
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1answer
105 views

Network Security with EAP: PEAP and Phase 2: MSCHAPv2?

I want to connect to my college WiFi but I’m worried about the security (data leakage, hacks, MITM). The configuration I used to connect to my college WiFi is as follows, EAP: PEAP Phase 2: MSCHAPv2 ...
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6answers
12k 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 ...
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1answer
72 views

Questions on the variations of RSA keys

I've built a simple application that reads in an RSA key, checks the header and starts identifying properties of the RSA key to make sure it is valid (Using child_process in express to run $ ...
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0answers
96 views

How secure is Veracrypt/Truecrypt with a 60 char password?

I have a 10gb drive encrypted by Veracrypt with a 60 char password. If someone gets their hands on it how will it a skilled attacker to crack my password? The password has around 30 characters of ...
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2answers
57 views

sharing private key sTunnel

All of the sTunnel guides and implementations at work do the same thing, they say once the private key and the public cert are created on the server, you need to cat them together and then share with ...
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1answer
44 views

What password based key derivation does PKCS #12 use?

I would like to make a note that I have read all of rfc 7292. I am trying to decrypt encrypted private key in a pkcs#12 pfx file. The private key is enveloped within pkcs#8 shrouded key bag. The ...
3
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3answers
293 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 ...
4
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4answers
200 views

How can using multiple laptops improve security?

My being an admirer of Edward Snowden I've read several books about him. In each book and article there was said that he used four laptops in Hong Kong. Not for storing the documents, but because it ...
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2answers
121 views

Hashed master password and generated encryption key in a password manager program

I'm writing a WPF password manager application to practice programming, so far this is the scheme I intend to use to store master password and individual site password: Master password: Generate a ...
4
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0answers
251 views

Why does Java allow AES-256 bit encryption on systems without JCE unlimited strength policies if using PBE?

It's fairly standard knowledge that due to the cryptography export controls, Oracle JRE ships with "limited" cryptographic strength enabled as listed in the JCA Documentation. For AES, the default max ...
6
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1answer
263 views

Should veil framework produce packed and obfuscated binaries which bypass virustotal?

I have been working with the veil framework to test an internal IDS system I have in place. I have used a public malware sample which produces an 8/53 hit score on Virustotal and run it through the ...
2
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3answers
2k views

Key Exchange using PKI

I'm new to the field of cryptography and trying out a sample program to understand PKI key exchange mechanism. I tried creating a self signed certificate using openssl openssl req -x509 -nodes ...
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1answer
84 views

Turning hex string into readable chars [closed]

I have this blob of hex data which can be found on https://www.reddit.com/r/codes/comments/421xek/can_somebody_help_me_decode_this_blob/ and I am looking to turn it into ...
2
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2answers
99 views

Is encrypted cookie without authentication secure enough?

I have some sensitive data in the cookie, e.g. it contains the user id that is later on used to execute the query and we trust the cookie because it is encrypted. All communication happens only on ...
0
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1answer
90 views

Sending Group Keys over network

For multicast encryption one user creates group keys on his local (Symetric and asymetric). If we encrypt these with other group user's public keys and send over networks . Is this acceptable? Can ...
2
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1answer
157 views

Encrypting data before sending to SaaS tool and decrypting on browser view

I'd like to send data to a SaaS tool, where the data is stored in the cloud. I'll use Google Analytics as an example, but it applies to any similar service. Google Analytics does not allow you to ...
1
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2answers
53 views

plain FTP (no encryption)

Person A want to send important excel files to Person B using plain FTP (no encryption). Person A says the "issue with private key encryption is that its tough to maintain across the company. Sharing ...