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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Encrypt password with salt

Can anyone explain why formula 1 is safer than formula 2?I don't get it even I get the answer. According to 2, it says as s is in plaintext form, the attacker can decrypt the password by (y.s). Isn'...
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50 views

Sensitive files in the Cloud: Automated mounted TrueCrypt volume

My current setup currently I'm using Boxcryptor Classic 1.x (still compatible to EncFS) to mirror some files with SyncBack Pro into the virtual Boxcryptor-Harddisk. Those get then encrypted by BC ...
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41 views

Best way to store SQLite password offline? [duplicate]

I'm developing a Windows application that uses SQLite, and I want to encrypt it (there is some sensitive information). The trouble is that one of the application requirements is that it must work ...
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59 views

What kind of encryption/encoding is this? [duplicate]

Unknown encryption/encoding: %7D12%25YEK%7BcX%25%26VF%5ExiGBL20E%7F%11,WJGLSSx%07DE%5D%5E%2B%26*2do_Le%1D%0D%13%2BG%5CAdt%0D%1B%1Dsh%04q%1Cw%12%09%03%17%07%02%7Cq%1E%11yulaOL%02B%5CTG%0D36%13ZCd.@...
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2answers
74 views

Storing two copies of data, encrypted in different ways

Our website has some personal data that needs to be visible to both the user it belongs to and the administrators. It also needs to be encrypted. As we want to maintain a simple system, just username ...
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0answers
35 views

Unable to view USB Hard drive contents after lock(read-only access)

My work laptop has PGP Desktop 10.3 and when I connected my USB flashdrive it prompted me to Encrypt or Lock. Given the information on both of these options the only choice I had in order to access ...
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24 views

AES256 nopadding vs PKCS7Padding

I was looking over AES Crypt's Java lib which seems like a secure AES encryption software and I noticed that they are using nopadding. Can somebody explain to me what the benefit of using nopadding as ...
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0answers
89 views

Decryption with two-way authentication

We have a Customer who wants his sensitive user-data stored with an encryption. These are the basic requirements: Sensitive user-data is stored in a database using encryption A remote-attacker who ...
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1answer
73 views

Is there a ransomware variant that checks for file's magic numbers to encrypt?

Is there a known ransomware-variant (Cryptolocker, Cryptowall etc.) that before encrypting the files checks for their magic numbers? Lets say that there's a Word file, that had its file extension ...
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1answer
67 views

Questions regarding AES 256

i have googled and searched quite alot but most things just state the same things but not answering my questions so hopefully you guys can help me out abit Story: i am looking at creating an ...
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1answer
46 views

How authentication tag is calculated in AES-GCM-256

I have a sample code,which encrypt and decrypt a string using AES-GCM-256. I am unable to understand,how authentication tag is being generated on encrypter side and how is that being used on ...
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1answer
295 views

How to make sure that the public key has not been tampered with during transit?

I understand how public key infrastructure works. There is a private and public key, and someone may use the public key to encrypt data that can only be decrypted with the private key. However ...
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17 views

Securing FTP Creds in a Java Open Source API

I've written a basic Java API and source code must be released to a small community for the application to function correctly. The Java API helps developers track data for their running scripts and ...
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0answers
46 views

Whatsapp and Viber information security

Is it possible for my ISP or government to MITM communication that I have made via one of these 2 services(I live in not so developed country) ? I think I am reasonably safe from attacks at transport ...
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0answers
32 views

Use MDC to provide origin authentication for public key encryption?

Why can't we use an manipultation detection code (MDC) to provide origin authentication when using public-key encryption?
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0answers
67 views

How do I securely encrypt and store database encryption keys? [duplicate]

I have a database with encrypted information, and want to encrypt each entry with a different key. Then I want to store the encrypted keys in another database. I know I have to encrypt the keys before ...
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9answers
6k views

Would an encryption scheme that generates an extra key to be securely stored offsite be a safe backdoor?

Let me be clear first and foremost: I do not think installing a backdoor in security algorithms is a good idea. They undermine the trust in the software and in the company that provides the service. ...
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2answers
218 views

How to tell if an email is encrypted, or just corrupted?

Ran a recovery program (Kroll Ontrack) on a Windows 7 PC and recovered many, many emails. Almost all of them open in my Windows 10 mail client (and Thunderbird), except for a handful from this March. ...
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2answers
150 views

store passwords as one-way-hash, or just use it as an AES key?

I want to store some data so the only one who'll be able to access it is the user itself. Here is my idea: when user registers, his password will be hashed in SHA256 (so it'll fit as an AES key), and ...
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2answers
109 views

Are the websites I visit using Windows Remote Desktop connection secure from my ISP?

Are the websites I visit using Windows Remote Desktop connection secure from my ISP? I am ok if my ISP knows the IP address of the remote desktop I am connecting with but will they also be able to '...
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2answers
26 views

Security fails in private key and xor

I've implemented a very short program to encrypt a file, and send it on a remote server. First, I build a key based on a pass-phrase and a subset of prime numbers (the length of the key is defined by ...
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0answers
41 views

Would encrypting a signed JWT prove viable to secure claims payload?

I am working on a server-client web application, and as an authentication scheme, I am issuing base64 encoded json web tokens. Consider the following token... eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9....
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2answers
82 views

What's the best place to hide long lived encryption keys

I am considering encryption options for a new Sybase project (internal facing only, sitting in our intranet) for a client that has a security policy that requires all sensitive data to use DB ...
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1answer
63 views

OpenSSL brute-force attacking and file size

I use OpenSSL with aes-256-cbc to encrypt a 30 GB tar file containing a recent backup of my hard drive. Now suppose somebody wants to run a brute-force attack on this file, trying out all possible ...
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1answer
45 views

Why is CBC-MAC insecure for variable length input?

Can anyone explain why CBC-MAC is not secure for variable length message? I read many books, but there are still some confusion. Like the highlighted parts in following pictures Slide 32: Slide 33:...
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1answer
83 views

Handling user login using asymmetric cryptography

Is it possible to implement a login protocol with asymmetric cryptography instead of the hashed password method? For example, while creating an account, the client generates a private/public key pair ...
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2answers
101 views

Is encrypting a CRC with the plaintext ok?

We're using encrypt-then-mac for authenticated encryption, and recently added a CRC32 to the plaintext. Are there any security problems with using a non-authenticated hash mechanism (for example, ...
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1answer
122 views

How secure is FaceTime by Apple

Apple says their messages and FaceTime calls are end-to-end encrypted and nobody can access them. As I'm unfamiliar with cryptology, I've found security white paper from Apple, where says: ...
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1answer
61 views

Making an encrypted SMS app (Android) [closed]

From my limited googling I've noticed that a lot of the mainstream encrypted messaging apps all are either (or a combination of!) closed-source, run through an uncontrolled third-party server, use a ...
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54 views

Is the QUIC protocol secure?

QUIC is a new protocol for video streaming, that can establish a secure connection in one round. It is used in Google's new Duo app for example. How does it work and is it secure (comparison with TCP ...
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0answers
79 views

Security of the shared secret key for a smart meter (Linky) [closed]

Reading the specs of a new electricity smart meter (called Linky in France), I was surprised about the chosen encryption method (128 bits symmetric key AES), based on a single secret key (called CCC ...
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2answers
81 views

Is there a difference between getting encryption key versus encrypted data from server in terms of security

Suppose we have web and application servers and trying to encrypt credit card information for our financial web application. Communication between web and app servers are secured through SSL/TLS. Lets ...
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1answer
50 views

Crypto++ RSA - Encrypt and sign with the same key pair

I have a program A which needs to send messages to several instances of program B (B1, B2, etc...). The messages must be encrypted, and also signed. Which means only Bn instances can decode, and they ...
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1answer
121 views

DES Decryption followed by Encryption, will it produce the original text?

This is regarding DES. My question is, if a plain text is first decrypted (with the decryption algorithm) using Key K1 and then encrypted using same K1, would the result still be the original plain ...
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1answer
89 views

Windows security & data protection

I work for a hotel. The hotel stores a MySQL database online. This database only contains a Reference ID, number of nights and so on, but no private data. No names, no personal information on guests. ...
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1answer
98 views

Known vulnerabilities of GOST

Are there any known vulnerabilities in the GOST block cipher (GOST 28147-89)? Spcifically, I'm thinking about i.e. "master keys" which intentionally exist and are used i.e. by the Russian government. ...
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1answer
127 views

How to protect TimeMachine backups from Ransomware?

According to Heise (German) Time Machine backups can be encrypted by Ransomware. Sorry I didn't find an English source, please use Google translate. KeRanger had an inactive module ...
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1answer
101 views

Who defined the term “end-to-end encryption”?

I am trying to find the origin of the term "end-to-end encryption", but have been unsuccessful until now.
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60 views

End-to-end encryption without user-keys interaction

Is it possible to have true end-to-end encryption even if the user is not involved in generating, selecting, transporting, or storing of the keys?
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40 views

VPN chain in one machine without VM natively

Is it any way to make VPN chain in one machine (MAC or WIN) without VM natively (L2TP/IPsec)? I need this for obtain an extra layer of security. For example - if one VPN turns off I still have ...
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38 views

Preventing a key from being found by analysis

Lets say Alice wants to send an encrypted message to Bob. They both know a secret key. Alice uses the key to encrypt the message and Bob uses the key to decrypt the message. Now, if the handshake ...
5
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0answers
45 views

Why would I use at-rest encryption over a DB's key-based encryption?

Goal I want to store encrypted data in a database. Constraints Application-level encryption (encrypting before sending to the DB) is not a reasonable option for my use case. The DB providers I'm ...
5
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1answer
128 views

How to share an encryption key between different PHP applications?

I'm working with the php-encryption library to provide integration between two different applications. On one side, I have a corporative application that holds all data from users. This application ...
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2answers
93 views

What information can my ISP see using squid proxy?

My ISP provides a transparent proxy to use and I can see that they are using the squid proxy for caching this. What I am wondering is what data can they see and what can they see further if they can ...
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1answer
147 views

How can this encryption algorithm be improved?

I am currently developing an application to store my passwords safely. It will be a proof-of-concept at first, but I am planning to upgrade it later. Anyway, here is how the passwords are accessed: ...
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1answer
153 views

Is this a good scheme for storing encrypted user credentials?

We are building a service that manages multiple user accounts. For that reason, we need to store the credentials to a user's accounts using a symmetrical algorithm so they can be retrieved for the ...
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2answers
3k views

Why was DES with 112 bit keys (IBM) reduced to 56?

On the French wikipedia page about DES it says that the original DES algorithm from IBM used 112 bit keys. Why did they reduce this to 56 bits? Edit: ok NSA convinced IBM but today it seems like a ...
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1answer
179 views

Is this algorithm really end to end encrypted and secure?

I'm creating an anonymous chat where one of the premises is that the conversations are end to end encrypted. I'm using firebase so all the comunication between the clients and the server is SSL ...
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2answers
1k views

What's the difference between a hashed and an encrypted password?

Alright, so I know this may sound dumb, but I'm having a hard time understanding what an encryption would be since it's different from a hash. I've read up on it, but I'm still not quite sure. So, I ...
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1answer
156 views

How to use nmap through proxychains?

Iam running nmap through proxychains using this comand proxychains nmap -v scanme.namp.org This produced an error showing like this root@kali:~# proxychains nmap -v scanme.nmap.org ProxyChains-3....