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Introduction

The AES encryption algorithm encrypts and decrypts data in blocks of 128 bits. It can do this using 128-bit, 192-bit, or 256-bit keys. AES using 128-bit keys is often referred to as AES-128, and so on. The following diagram provides a simplified overview of the AES process Plain text. This is the sensitive data that you wish to encrypt. 128-bit encryption is a data/file encryption technique that uses a 128-bit key to encrypt and decrypt data or files. It is one of the most secure encryption methods used in most modern encryption algorithms and technologies. 128-bit encryption is considered to be logically unbreakable. 128-bit encryption is a data/file encryption technique that uses a 128-bit key to encrypt and decrypt data or files. It is one of the most secure encryption methods used in most modern encryption algorithms and technologies. 128-bit encryption is considered to be logically unbreakable. The all-in-one ultimate online toolbox that generates all kind of keys! Every coder needs All Keys Generator in its favorites! It is provided for free and only supported by ads and donations.

We get many queries from people about how to use keys in cryptography and how to represent them. This page is a simple introduction. If you take away nothing else, remember thata password is not a key.

Contents

What is a key?

A definition of a key from ISO/IEC 10116 (2nd edition): 1997 is

A sequence of symbols that controls the operation of a cryptographic transformation (e.g. encipherment, decipherment).

In practice a key is normally a string of bits used by a cryptographic algorithmto transform plain text into cipher text or vice versa. The key should be the only partof the algorithm that it is necessary to keep secret.

Key length

The key length is usually expressed in bits, 8 bits to one byte. Bytes are a more convenient form for storing and representing keys because most computer systemsuse a byte as the smallest unit of storage (the strict term for an 8-bit byte is octet). Just remember that most encryption algorithms work withbit strings. It's up to the user to pass them in the required format to the encryption function they are using. That format is generally as an array of bytes, but could be in hexadecimal or base64 format.

In theory, the longer the key, the harder it is to crack encrypted data.The longer the key, however, the longer it takes to carry out encrypion anddecryption operations, although with modern computers, this is not normally an issue.Speed might be an issue with a smart card, for example.

Block cipher encryption algorithms like AES and Blowfish work by taking a fixed-length block of plaintext bits andtransforming it into the same length of ciphertext bits using a key.Blowfish uses a variable key length between 8 and 448 bits long. It is atthe choice of the two parties exchanging data to agree what length they use. Most other block cipher encryption methods have a fixed length key. For example, DES has a64-bit key (but only uses 56 of them) and Triple DES has a 192-bit key (but only uses 168 of them).IDEA uses a 128-bit key.The Advanced Encryption Algorithm (AES) has a choice of three key lengths: 128, 192 or 256 bits.Public key encryption algorithms like RSA typically have key lengths in the order of 1000-2000 bits.Be careful with the difference in key lengths for block cipher algorithms and public key algorithms.According to SP800-57 Part 1 Table 4, a 192-bit Triple DES key is equivalent in security terms to a 2048-bit RSA key, andan AES-128 key is equivalent to a 3072-bit RSA key.

How relevant is key length?

To crack some ciphertext encrypted with a 64-bit key by the brute-force method oftrying everycombination of keys possible means you have 2^⁶⁴ possible combinationsor 1.8 x 10^¹⁹ (that's 18 followed by 18 naughts). You can expect, on the average, to find a correctanswer in half this number of tries. If you have a computer that can carry out one encryptionoperation every millisecond, it will take about 292 million years to find the correct value.Speed up your computer by a million times and it will still take about 3 centuries to solve.The equivalent brute force technique for a 128-bit key will, in theory, take a 'long time', probably past the expected life of the universe.But, in practice, a set of supercomputers operating in parallel can crack a 64-bit key ina relatively short time. If an attacker has access to a large selection of messages all encryptedwith the same key, there are other techniques that can be used to reduce the time to derive the key.

Will other people try and crack my ciphertext?

Your competitors in business and people who you suspect log your encrypted credit card number from the Internet don't usually have these facilities at their disposal. However, if an organisation like the NSA wanted to,they may well be prepared to put such resources into it. We doubt that the NSA or anyone else forthat matter is routinely decrypting all your PGP emails.You are not that important - see SatireWire'svery amusing article Hackers Beg Boring People To Stop Encrypting Email.Security Experts Concur Most of You Have Nothing Worth Encrypting.However, 'they' may well be flagging emails that are sent encrypted andkeeping a copy of them. If some other incriminating evidence comes up about you, they may then go back and try to decrypt them.On the other hand, they could just arrest you and force you to tell themyour password: how long are you prepared to protect your secret love letters when someone is using a thumbscrew on you?

How do encryption schemes fail?

Most encryption schemes are cracked not by brute forcetrying of all possible combinations of key bits, but by using otherknowledge about how the sender derived the key. This could be a faultyrandom number generator known to used by the system, or knowledge that theuser derived the key solely from a password of only the letters a to z, or just used simpleEnglish words. Or perhaps by finding out the keystrokes typed on the keyboard bythe user with a keystroke logger, or by bribing (or torturing) someone to give them the key, or by reading the post-it note the user has conveniently left on the side of the computerwith the password written on it.The traps are many and subtle and even the experts get it wrong. Why spend hours trying to pick the expensive security lock when the owner of the house has left a window open?

Strictly, it's not the length of the key, but the 'entropy' in the methodused to derive the key. There is approximately one bit ofentropy in an normal ascii character. If you derive a 128-bit key from a passwordor pass phrase, you will need a very long pass phrase to get enoughtheoretical entropy in the key to match the security of the underlying keylength: Bruce Schneier estimates that you need a 98-character English passphrasefor a 128-bit key. Most people can't be bothered with such a cumbersome passphrase.

Using AES with a 128-bit key should provide adequate security for most purposes. The longer you intend to keep the encrypted data secret, the longer the key you should use, on the principle that cracking techniques will continue to improve over time.Bruce Schneier recommends a 256-bit key for data you intend to keep for 20-30 years.

No one is going to criticise you for using a key that is too long provided your softwarestill performs adequately. However, in our opinion, the biggest danger in using a key that is too large is the falsesense of security it provides to the implementers and users. 'Oh, we have n-million-bit security in our system' may sound impressive in a marketing blurb, but thefact that your private key is not adequately protected or your random number generator is not random or you have used an insecure algorithm may mean that the total security is next to useless.

Remember it is the security of the total system that counts, including procedures followed by users.

Choice of Algorithm

Whatever you use, use an accepted algorithm: AES, Blowfish, Triple DES,IDEA, etc. Don't try making up your own algorithm; you aren't that good. The only secret should be in the value of thekey. Everything else should be publicly available for scrutiny. Any systemthat is otherwise is known as 'snake oil'.

Password, pass phrase and key

People often get confused between 'password' and 'key'. A password istypically a series of ASCII characters typed at a keyboard, e.g. 'hello123' or 'my secretpass phrase'. This makes it easier for users to remember. They are, ofcourse, much easier to crack because there are significantly fewercombinations to choose from.

A pass phrase is simply a password that consists of several words in a string, e.g. 'she sells sea shells', so the terms 'password' and 'pass phrase' are equivalent for our purposes.In principle, a pass phrase makes it easier for a user to remember a long combinationof characters. In practice, this adds to security only if the pass phrase is somethingknown only to the user. Don't use quotes from famous literature - hackers read them, too.

A key used by an encryption algorithm is a bit string. A 128-bit key willhave exactly 128 bits in it, i.e. 16 bytes. You will often see keys writtenin hexadecimal format where each character represents 4 bits, e.g.'FEDCBA98765432100123456789ABCDEF' represents 16 bytes or 128 bits. The actual bits in thisexample are

There are many, many more combinations of 128 bits thanof combinations of a few simple letters of the alphabet.This is where the security comes in.

How should I derive the key?

How you get from the password to the key is one of the tricks to ensuregood, underlying security. One method is to use a one-way hash functionsuch as SHA-1 or MD5. This takes a message of varying length and creates adigest of a fixed length. MD5 produces a digest of 128 bits or 16 bytes; SHA-1 produces one of 160 bits or 20 bytes. (Thanks to Jorge Fabregas for pointing out that an MD5 digest is 128 bits, not 64.)

The same message will always give the samedigest, but it should be impossible (strictly, computationally infeasible)to derive the message from the digest. Well, maybe not. Remember that hackers know the digest values for all the simple passwords: for example, MD5('password')=5f4dcc3b5aa765d61d8327deb882cf99.

To improve security, we should mix in a few randombytes (a salt) with the message and re-hash it a given number of times to produce abit string to use as a key. Obviously, whatever method you use, you will need to be ableto reproduce the same key given the same password when you come to decrypt your message.

Example 1

We are using an encryption algorithm that uses a 128-bit key. Our userhas entered the ascii string 'abc' as the password they want to use to encrypt their secret data. The data may involve details of secret liaisons that our client is havingwith his mistress,or an important business deal, or the medical history of a patient, or the codeword to trigger a world-wide nuclear war. We don't care about the significance; we are going to apply our encryption algorithm that requires a 128-bit key to transform plain text into cipher text.Our problem is how to derive a key.

The ascii string 'abc' consists of the three bytes with hexadecimal values 61, 62, 63.We need 16 bytes for our key, we only have 3. We could just do a direct conversionand use the key Obviously this does not give us much security as we are only using 24 out of the 128bits. The fact that 'abc' will only take a few seconds to guess anyway is another issue.

If we hash this with MD5 we get the following 16 bytes:

If we hash these bytes again, we get:

and so on. Notwithstanding the poor choice of password in the first place, these bit strings could be used as keys in our encryption algorithm.

If we only needed a 64-bit key, we could just use the first 8 bytes. If we needed a256-bit key, we could concatenate (join together) the two hash digests and use that.

However, there are limitations in this simple method. True, we have expanded our simplethree-character password into a longer bit string, but if an attacker knows the methodwe have used to derive the key from the password, he, too, can do the same for all possiblecombinations of letters. The key space is still just as small as we started with.An attacker could just prepare a lookup table of hashed results for all the possible combinationsof words in the dictionary and use that.

A good designer should assume that the key derivation method is known to an attacker. It is not good enoughjust to hope it's well hidden. The only secret should be the password itself.

Example 2

There are two standard methods to hinder an attacker's ability to reproduce our key derivation function. The first is salting and the second isstretching where we introducean iteration count. Salting involves mixing in some random data with thepassword. This greatly increases the possible number of keys that could be derivedfrom a given password and prevents an attacker from compiling a dictionaryof pre-computed values. The iteration count specifies that the function must be repeated a given number of times,say, a minimum of 1000. This forces an attacker to go to a lot of extra work when trying out alternatives, but is not particularly onerous for a valid user.

You must be able to communicate the salt and iteration count to the other party so they can reproduce the same key from the password. This informationcan be sent in the clear. The iteration count can be agreed and fixed for all messages,but the seed must be different for each message.

In this example, we start with our password 'abc' but select a random set of 8 bytesto use as a salt (S), say,

and specify that the iteration count (c) is to be 1000. We concatenate our password and salt and compute the hash of this:-

Then we repeat this until we have carried out the hash 1000 timesWe use the final digest 8FD6158BFE81ADD961241D8E4169D411 as the key to encrypt the data.

The next time we send a message, we use the same password but a different salt, say,

and specify the iteration count to be 2048. In this case, using the same method as before, the resulting key will beCC584D1EE305FB7EF65926F62E88DFE3.

Note we are not condoning using such a simple combination as 'abc' as a valid password.It is merely used to show the technique.

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This password-based encryption algorithm is known as PBKDF1.The Visual Basic code basMD5pbe1.bas shows how to carry out above computations.Thanks to Chris Searl for pointing out an error in an earlier version.

Another complication arises with systems set up for oriental characters. We could writea book on this topic (and many people have). Put simply, if your computer is set up for US-English, all the characters you need to display can be representedby a single 8-bit byte. So it is a simple matter to go from the string 'abc' to the three bytes 0x61,0x62 and 0x63 that we can then use to derive our key bit string. When we start using systems set up for oriental characters, things get complicated,and converting a password string into bytes becomes messy. See Cryptography with International Character Setsand Cross-Platform Encryptionfor more information on this topic.Just remember that, in Visual Basic, always use the Byte type to do yourcryptographic operations and always convert your password String type into a Byte array first.

Password-Based Encryption Algorithms

The RSA Laboratories documentPKCS#5: Password-Based Cryptography Specification Version 2.0describes two secure password-based encryption (PBE) algorithms.This Visual Basic code basPBKDF2.bas demonstratesthe use of the PBKDF2 algorithm using the built-in function in ourCryptoSys API package.

Hindering brute force password cracking

If we have an application that uses a password to allow users access to sensitiveencrypted data, it is exposed to the possibility that someone may just try every conceivable password until they succeed. There are automated programs out therethat do just that.Most users if left to themselves will choosesimple, easy to remember passwords that considerably reduce the possible number ofcombinations.For some interesting research on this topic seeThe Memorability and Security of Passwords by Ross Anderson and othersfrom Cambridge University.

As a designer there are two simple techniques to use to improve security:

1. Three strikes and you're out
2. Introduce a delay before responding

In the first technique, you only allow the user three attempts to log in and then shut down the application, or at leastthe user's access screen. This is easy to implement on an EXE application on a PC, but harder todo with a web application where each attempt to log in is a separate event as far as the serveris concerned and people can just keep trying.

In the second technique, you deliberately introduce a short delay of, say, half a second, before confirming or rejecting the user's attempt to log in. The user will hardly noticesuch a short delay, but this will severely hamper a cracker's automated attempt to tryall variations in a short time.

Oh yes, and don't limit your users to ridiculously short passwords.

What's base64 encoding?

'Encoding' simply means converting data from one form to another, notnecessarily encrypted. Just remember that Encoding is not encryption.base64 encoding is a method to convert 8-bit characters to 7-bitcharacters so they can be transferred over the internet. MIME uses this; so does PGP.It's also known as radix 64 encoding. Binary data encoded with base64 encoding looks like

This represents the 8 bytes

A base64 string consists of the 64 characters A-Z, a-z, 0-9 and '/' and '+', and can be terminatedby up to two '=' characters for padding.Each four base64 characters represent three bytes. A valid base64 string will always be an exact multiple offour characters long. In practice, programs that decode from base64 will (should) just ignore characters that are notvalid; but if a '=' character is found, it should be taken as indicating the end of the data.

Hexadecimal notation

Hexadecimal means a number expressed in base 16. The convention is that each digitcan be between 0 and 15 in value and is represented by the characters 0-9 and A-F. It does not matter whether the letters are in upper- or lower-case. The 4-bit number that a hexadecimal digit represents is sometimes referred to asa nibble or nybble ('byte', 'nybble', get it?).

Hexadecimal	Decimal	Binary
0	0	0000
1	1	0001
2	2	0010
3	3	0011
4	4	0100
5	5	0101
6	6	0110
7	7	0111
8	8	1000
9	9	1001
A	10	1010
B	11	1011
C	12	1100
D	13	1101
E	14	1110
F	15	1111

In the C programming language, hexadecimal values are expressed in the form 0x7ABF, where the '0x' signifies a number following in hexadecimal. In Visual Basic, the format is &H7ABF. In Assembler language, the format is 7ABFH.They all mean the same thing.The usual convention is that bits to theleft are the most significant and those to the right are the least significant. This would mean that 7ABF (or 0x7ABF in C or &H7ABF in Visual Basic) would represent thedecimal integer 31423. (Hint: use the Calculator that comes with Windows todo these conversions - use it in Programmer mode.)

Try this in your Visual Basic (VB6) debugger:-This shows how to convert between hexadecimal and decimal format in Visual Basic.

Now try this example:-

Now why doesn't the second statement give us what we expect? This is because of thesign bit - Visual Basic 6 uses 'signed' arithmetic and we want to use 'unsigned'.This is a topic for another time. (For the solution, see Binary and Byte Operations in Visual Basic on our Cryptography page.)

What's big-endian and little-endian?

How your computer actually stores its data is another issue again - there are big-endian computers that store their data with the most significant byte first, and little-endiancomputers that store their data with the least significantbytes first. Unix-based systems are often big-endian. Intel-based Windows computers are little-endian.However, this is only of interest to us if we go poking around looking at howthe bytes are arranged inside our computer memory and, for practical purposes, only serves to confuse an otherwise messy subject. The usual convention is to write out bit strings with the most significant bit first.

Other Information

For an introduction on how to use padding in cryptography, seeUsing Padding in Cryptography.

Contact

To comment on this page or ask a question, please send us a message.

This page last updated 14 October 2014

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Note

No new features or functionality are being added to Media Services v2.
Check out the latest version, Media Services v3. Also, see migration guidance from v2 to v3

You can use Media Services to deliver HTTP Live Streaming (HLS) and Smooth Streaming encrypted with the AES by using 128-bit encryption keys. Media Services also provides the key delivery service that delivers encryption keys to authorized users. If you want Media Services to encrypt an asset, you associate an encryption key with the asset and also configure authorization policies for the key. When a stream is requested by a player, Media Services uses the specified key to dynamically encrypt your content by using AES encryption. To decrypt the stream, the player requests the key from the key delivery service. To determine whether the user is authorized to get the key, the service evaluates the authorization policies that you specified for the key.

Media Services supports multiple ways of authenticating users who make key requests. The content key authorization policy can have one or more authorization restrictions, either open or token restrictions. The token-restricted policy must be accompanied by a token issued by a security token service (STS). Media Services supports tokens in the simple web token (SWT) and JSON Web Token (JWT) formats. For more information, see Configure the content key's authorization policy.

To take advantage of dynamic encryption, you need to have an asset that contains a set of multi-bitrate MP4 files or multi-bitrate Smooth Streaming source files. You also need to configure the delivery policy for the asset (described later in this article). Then, based on the format specified in the streaming URL, the on-demand streaming server ensures that the stream is delivered in the protocol you selected. As a result, you need to store and pay only for the files in single storage format. Media Services builds and serves the appropriate response based on requests from a client.

This article is useful to developers who work on applications that deliver protected media. The article shows you how to configure the key delivery service with authorization policies so that only authorized clients can receive encryption keys. It also shows how to use dynamic encryption.

For information on how to encrypt content with the Advanced Encryption Standard (AES) for delivery to Safari on macOS, see this blog post.For an overview of how to protect your media content with AES encryption, see this video.

AES-128 dynamic encryption and key delivery service workflow

Perform the following general steps when you encrypt your assets with AES by using the Media Services key delivery service and also by using dynamic encryption:

1. Create an asset, and upload files into the asset.

2. Encode the asset that contains the file to the adaptive bitrate MP4 set.

3. Create a content key, and associate it with the encoded asset. In Media Services, the content key contains the asset's encryption key.

4. Configure the content key's authorization policy. You must configure the content key authorization policy. The client must meet the policy before the content key is delivered to the client.

5. Configure the delivery policy for an asset. The delivery policy configuration includes the key acquisition URL and an initialization vector (IV). (AES-128 requires the same IV for encryption and decryption.) The configuration also includes the delivery protocol (for example, MPEG-DASH, HLS, Smooth Streaming, or all) and the type of dynamic encryption (for example, envelope or no dynamic encryption).

   You can apply a different policy to each protocol on the same asset. For example, you can apply PlayReady encryption to Smooth/DASH and an AES envelope to HLS. Any protocols that aren't defined in a delivery policy are blocked from streaming. (An example is if you add a single policy that specifies only HLS as the protocol.) The exception is if you have no asset delivery policy defined at all. Then, all protocols are allowed in the clear.

6. Create an OnDemand locator to get a streaming URL.

The article also shows how a client application can request a key from the key delivery service.

You can find a complete .NET example at the end of the article.

The following image demonstrates the workflow previously described. Here, the token is used for authentication.

The remainder of this article provides explanations, code examples, and links to topics that show you how to achieve the tasks previously described.

Current limitations

If you add or update your asset's delivery policy, you must delete any existing locator and create a new locator.

State/province - The state in which your organization is located.6. In the 'Cryptographic Service Provider Properties' window, leave both settings at their defaults (Microsoft RSA SChannel and 2048) and then click next.8. Generate private key from certificate request template. City/locality - The city in which your organization is located. Click Next.7.

Create an asset and upload files into the asset

To manage, encode, and stream your videos, you must first upload your content into Media Services. After it's uploaded, your content is stored securely in the cloud for further processing and streaming.

For more information, see Upload files into a Media Services account.

Encode the asset that contains the file to the adaptive bitrate MP4 set

With dynamic encryption, you create an asset that contains a set of multi-bitrate MP4 files or multi-bitrate Smooth Streaming source files. Then, based on the specified format in the manifest or fragment request, the on-demand streaming server ensures that you receive the stream in the protocol you selected. Then, you only need to store and pay for the files in single storage format. Media Services builds and serves the appropriate response based on requests from a client. For more information, see Dynamic packaging overview.

Note

When your Media Services account is created, a default streaming endpoint is added to your account in the 'Stopped' state. To start streaming your content and take advantage of dynamic packaging and dynamic encryption, the streaming endpoint from which you want to stream content must be in the 'Running' state.

Also, to use dynamic packaging and dynamic encryption, your asset must contain a set of adaptive bitrate MP4s or adaptive bitrate Smooth Streaming files.

For instructions on how to encode, see Encode an asset by using Media Encoder Standard.

Create a content key and associate it with the encoded asset

In Media Services, the content key contains the key that you want to encrypt an asset with.

For more information, see Create a content key.

Configure the content key's authorization policy

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Media Services supports multiple ways of authenticating users who make key requests. You must configure the content key authorization policy. The client (player) must meet the policy before the key can be delivered to the client. The content key authorization policy can have one or more authorization restrictions, either open, token restriction, or IP restriction.

For more information, see Configure a content key authorization policy.

Configure an asset delivery policy

Configure the delivery policy for your asset. Some things that the asset delivery policy configuration includes are:

• The key acquisition URL.
• The initialization vector (IV) to use for the envelope encryption. AES-128 requires the same IV for encryption and decryption.
• The asset delivery protocol (for example, MPEG-DASH, HLS, Smooth Streaming, or all).
• The type of dynamic encryption (for example, AES envelope) or no dynamic encryption.

For more information, see Configure an asset delivery policy.

Create an OnDemand streaming locator to get a streaming URL

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You need to provide your user with the streaming URL for Smooth Streaming, DASH, or HLS.

Note

If you add or update your asset's delivery policy, you must delete any existing locator and create a new locator.

For instructions on how to publish an asset and build a streaming URL, see Build a streaming URL.

Get a test token

Get a test token based on the token restriction that was used for the key authorization policy.

You can use the Azure Media Services Player to test your stream.

How can your client request a key from the key delivery service?

In the previous step, you constructed the URL that points to a manifest file. Your client needs to extract the necessary information from the streaming manifest files to make a request to the key delivery service.

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Manifest files

The client needs to extract the URL (that also contains content key ID [kid]) value from the manifest file. The client then tries to get the encryption key from the key delivery service. The client also needs to extract the IV value and use it to decrypt the stream. The following snippet shows the <Protection> element of the Smooth Streaming manifest:

In the case of HLS, the root manifest is broken into segment files.

For example, the root manifest is: http://test001.origin.mediaservices.windows.net/8bfe7d6f-34e3-4d1a-b289-3e48a8762490/BigBuckBunny.ism/manifest(format=m3u8-aapl). It contains a list of segment file names.

If you open one of the segment files in a text editor (for example, http://test001.origin.mediaservices.windows.net/8bfe7d6f-34e3-4d1a-b289-3e48a8762490/BigBuckBunny.ism/QualityLevels(514369)/Manifest(video,format=m3u8-aapl), it contains #EXT-X-KEY, which indicates that the file is encrypted.

Note

If you plan to play an AES-encrypted HLS in Safari, see this blog.

Request the key from the key delivery service

The following code shows how to send a request to the Media Services key delivery service by using a key delivery Uri (that was extracted from the manifest) and a token. (This article doesn't explain how to get SWTs from an STS.)

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Protect your content with AES-128 by using .NET

Create and configure a Visual Studio project

1. Set up your development environment, and populate the app.config file with connection information, as described in Media Services development with .NET.

2. Add the following elements to appSettings, as defined in your app.config file:

Example

Overwrite the code in your Program.cs file with the code shown in this section.

Note

There is a limit of 1,000,000 policies for different Media Services policies (for example, for Locator policy or ContentKeyAuthorizationPolicy). Use the same policy ID if you always use the same days/access permissions. An example is policies for locators that are intended to remain in place for a long time (non-upload policies). For more information, see the 'Limit access policies' section in Manage assets and related entities with the Media Services .NET SDK.

Make sure to update variables to point to folders where your input files are located.

Media Services learning paths

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Media Services v3 (latest)

Check out the latest version of Azure Media Services!

Media Services v2 (legacy)

Provide feedback

Use the User Voice forum to provide feedback and make suggestions on how to improve Azure Media Services. You also can go directly to one of the following categories: