Integrity is the property of preventing unauthorized modifications of an asset. In other words, integrity protects against the threat of tampering. It is one of the three key security properties of an asset, along with confidentiality and availability.

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Company decrypting SSL, is it common?

We've just implemented a proxy that decrypts all SSL traffic in order to classify and scan it. Naturally a lot of our users feel concerned. We're a small company (100 users) owned by a big company ...
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2answers
149 views

Stream/block cipher add a simple hash to guarantee integrity

The question is simple: Adding a hash to a message and then encrypt it using a stream cipher / block cipher. Why can't this guarantee integrity of the message upon decryption?
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89 views

Hashing a hard drive before shutdown

Problem: Currently have no way to verify integrity of my offline encrypted system. I would like to ensure the system hasn't been physically tampered with while I've been away from it. (To ...
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1answer
105 views

Why does integrity exclude confidentiality? [closed]

I'm trying to understand the CIA triad. I read that all three parts of the triangle exclude each other, but I don't understand why you can't have full integrity and full confidentiality? I figure you ...
0
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1answer
52 views

Security Engineering Potential Threat?

I've been working on some security engineering problems and there is no solution provided so if someone can clarify, would be great. From the point of view of security engineering, which is not a ...
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2answers
46 views

Application Authentication [duplicate]

We are developing an Android/iOS app. This app tracks the user's GPS coordinates and send them to the server along with other data. The integrity of the sent data is too critical for our service. We ...
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2answers
43 views

Protect against malicious client with key derivation function (PBKDF2)?

Consider a protocol that allows clients to retrieve XML "forms" from a server. Forms are identified by a unique, randomly generated form ID that is embedded in the form. Clients fill out the form and ...
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4answers
997 views

Why secure encrypted data consistency by strong hashing?

Consider the SSH protocol: the SSH packet is like [data, SHA1(data)]. The packet is entirely encrypted by a block cipher. The question is, why do we need a strong hash to protect the packet ...
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1answer
67 views

Good way to make a secure token for logged out users

I work for a firm that has a marketplace on the web. We want to make a link with a token that stops an ad on the marketplace without the user being logged in. Someone suggested that we make a token ...
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2answers
73 views

Is there any reason to send file checksum for signed, encrypted files with MDC

I am using OpenPGP and sending a signed, encrypted file with forced MDC (Modification Detection Code) over the network. In typical file transfer scenarios where security is not in picture, an md5 ...
4
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1answer
94 views

MD5 security concerns in download verification

The MD5 hashing algorithm is known to be vulnerable to collisions for a number of years now, see its Wikipedia entry. Still, I see that in many places throughout the web, MD5 is used to verify ...
2
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1answer
120 views

TLS WG Charter and Security Goals

I was looking at the TLS Working Group Charter. I noticed that confidentiality and integrity of messages for those who desire it are not goals for the group. Naively, I believe confidentiality and ...
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1answer
41 views

Downloading Text from Articles [closed]

Is there any security measures that I should take when downloading article text from the web as far as file integrity? For example, I've written a bot that retrieves article text from a user's blog ...
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0answers
98 views

Which system files are targeted by malware on Windows XP?

On Windows XP, what are the main system files and DLL files are targeted by malware ? I need this information in order to make a hash of those files and check if my system will be compromised in the ...
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1answer
42 views

Does ASP.NET guarantee the integrity of a page's controls on a post back?

Say you have an ASP.NET page that lists the prices for certain items in labels. I know it's cringe-worthy, but say you took the price of the item from the label on the page to determine what the user ...
2
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1answer
77 views

JavaScript code authenticity when loaded from 3rd party website

Background A discussion about not sourcing JavaScript files from other websites (http://www.reddit.com/r/netsec/comments/29hfhz/please_dont_use_externally_hosted_javascript/) got me thinking. ...
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2answers
48 views

Purpose of integrity checking in installers

There are many programs available (like NSIS) that generate installers from a collection of files. One thing that I have noticed is, the installers produced by these programs have some kind of ...
6
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1answer
235 views

What prevents the Intel TXT boot loader from being maliciously altered?

From my understanding of Intel TXT, the technology can be used to put the processor in a trusted state where measurements can be performed. My understanding looks something like this, where I believe ...
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0answers
55 views

Is the digital declaration just an obscure proposal?

One professor from my university proposed me and some colleagues to work on a paper about the digital declaration (which is supposed to be better than the digital signature) for passing the subject. ...
5
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1answer
278 views

Is the SD card write protection hard-wired or optional?

According to Wikipedia, the SD card reader recognizes if the little tab on the left of the SD card is in the "lock" position or not. Thus, a SD card reader can still write on the SD card even if the ...
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2answers
104 views

How to prove the integrity of a digital file if certificates are not an option

Certificates are a fantastic way to prove the integrity of a file - provided that they have been signed from the beginning. This methodology can prove the files authenticity, in addition proving it's ...
4
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4answers
230 views

Contact person by phone, when their phone might have malware

I have a problem setting where I want to contact a user by phone, and where I need to protect the integrity of the phone call as much as possible. I'm wondering about how to design the interaction in ...
3
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1answer
1k views

Who is the creator of the CIA triad?

The Information Security goals - Confidentiality, Integrity and Availability (CIA) - are often referenced to as the CIA triad. As I am writing on my master thesis, I am wondering to which resource I ...
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2answers
72 views

How to detect changes to client

I am developing a Java game and money is involved. As such, I want to prevent people from modifying the client if at all possible (I'm a game designer, not a security expert). I know that it is ...
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2answers
133 views

Data integrity of malicious content in the database

From a data integrity standpoint, if I persist the following code into my database: <script> alert('hi'); </script> should I sanitize it before persistence, for instance making ...
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3answers
220 views

Security goals vs ITU-T security services

I am doing a course on cryptography, and there I learned that the major security goals are Confidentiality Integrity Availability Also I Learned that ITU-T provides 5 different security services ...
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2answers
1k views

How can I check the integrity of the downloaded files?

I know we use hash functions to check for the integrity of the files etc... but my question is how can we check for the integrity of the files being downloaded from some server?
2
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1answer
412 views

What extra protection is added to an REST API over HTTPS by the use of some kind of HMAC?

I'm designing a RESTFUL API that will always be used over HTTPS, what security advantages over the use of HTTP Basic Auth could be brought to my system by using such kind of message authentication ...
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2answers
523 views

Prevent my site to be sniffed and changed by man-in-the-middle-attacks

I want to secure site which is locally used for Prepaid Services, the site has been hacked many times, for the first step, I implemented SSL and its now working fine, however, I want to be sure that ...
3
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1answer
479 views

Is Torrent safe for sharing legitimate files (file verification)? Does it use SHA1 or SHA256?

Let's assume that a legitimate torrent file has been safely and successfully downloaded over HTTPS and perhaps even OpenPGP verification was used to verify the integrity of the torrent file. How good ...
16
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1answer
634 views

Is there a way to verify a binary against the sources?

It seems like there is no practical way to verify the full integrity path of precompiled and packaged software? I can check the downloaded package itself by hashes, but I have no verification if the ...
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2answers
149 views

Check integrity of GnuPG inside of GPGTools?

Is it possible to check the integrity of the GnuPG files inside of the downloaded installation package of GPGTools? I know how to check the integrity of the .dmg file (compare the SHA1 hash), but I ...
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2answers
125 views

Allow or Deny Access to a Network Based on Client Hardware [duplicate]

We have to build a product that will have a network. Users will be able to connect to this network by downloading a client. However, before allowing them to access the network we want to check if ...
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1answer
77 views

How to protect integrity of resource files in a white-box attack context?

In a white-box attack context (e.g. PC, tablet, smartphone), there is no trusted entity, which can be used to guarantee some reasonable security. TPM is not considered a solution because it is not ...
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2answers
244 views

Recommended authenticated stream cipher for minimum overhead?

I'm running my TCP/IP protocol secured by encrypting each packet with AES128/CBC, bundling a SHA256 HMAC over that packet. This causes quite a bit of space overhead for small packets, so at first I ...
4
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1answer
394 views

In the Clark Wilson models, why can't the TPs be executed in parallel?

I am studying the Clark-Wilson model, I can't exactly understand why the TPs must be executed in serial, is there a way to execute them in parallel? What would happen if I did execute them in ...
4
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3answers
2k views

Using MD5 for file integrity checks?

General Always check the MD5 hashes of the .NET Framework assemblies to prevent the possibility of rootkits in the framework. Altered assemblies are possible and simple to produce. Checking ...
5
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1answer
136 views

Integrity check against package repository?

I have a Debian installed. When there are security updates, I review and install them as soon as possible and think about using automatic updates. From time to time I want to boot from a clean boot ...
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4answers
1k views

Safest way for multiple users post to a single social networking account

Suppose I have a team or organization managing a single twitter account and a single facebook page. Different users need to be able to post content to the same account. How can I minimize the risk of ...
3
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3answers
309 views

How do I transfer the HMAC?

I have a file I'd like to encrypt with a symmetric key using AES-256 and then use an HMAC for integrity. So I don't "roll my own" scheme which I know is a big mistake, what are the standards for using ...
5
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1answer
130 views

Authentication by Signing or MAC?

I'm still new to security, so I'm sorry if this question doesn't make sense or if I'm completely off base with something. I've got some messages I want to encrypt (probably with AES-256-CBC) and send ...
3
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2answers
246 views

Confidentiality and integrity for web session

When the client authenticates with our service, he is issued an opaque "token". This token includes the information, that identifies the client and some other information about the client ("payload"). ...
5
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2answers
1k views

What security standards and regulations are in place for bank ATM?

Are there any international or US mandated standards and regulations that apply to communications between automatic teller machines and bank's central office? Are banks or ATM operators subjected to ...
4
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2answers
631 views

How to correctly implement AES in a backup application

I am writing a back-up application which should have the feature of encrypting the back-up. It must encrypt file data, paths and filenames. The application is being written in C# (.NET). Target is ...
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1answer
114 views

Ciphertext for email vs Ciphertext for database

Let's say Bob wants to send a message to Alice. This communication requires to achieve confidentiality, integrity, proof of origin, non-repudiation. Therefore we can use this cipher-text: ciphertext ...
0
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3answers
1k views

Why is it necessary to match the checksum of a download with another file provided by the same server? [duplicate]

Possible Duplicate: Does hashing a file from an unsigned website give a false sense of security? On many servers providing files for download, there is a file on which checksums are ...
3
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2answers
266 views

What's the point of using multiple checksum algorithm with “aide”?

In aide the author offers more than one hash algorithm to do the check-sum, why is that? Aren't a single one, i.e sha512 enough for determining file changes? I believe these algorithms are all ...
0
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1answer
80 views

how to stop write downs

Consider a scenario with two security levels, Alice and Bob. Bob is Alice's boss. Bob must be able to read Alice's documents but not write anything to her documents. I am using encryption keys to ...
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2answers
494 views

Access control matrix and integrity

Can access control matrix in addition to confidentiality provide the integrity of the objects to which access is being controlled?
2
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1answer
229 views

Password checking in the context of symmetric encryption

It is my understanding that block ciphers like AES don't have any built-in mechanisms to verify data integrity upon decryption, although some modes of operation might provide that. I played around ...