Unlocking the Power of Digital Signature Legitimateness for R&D in Australia
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FAQs
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What is the digital signature legitimateness for RD in Australia?
The digital signature legitimateness for RD in Australia ensures that electronic signatures are legally binding and recognized under Australian law. This means that documents signed using a digital signature are considered valid and enforceable, providing security and trust in digital transactions.
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How does airSlate SignNow ensure compliance with digital signature legitimateness for RD in Australia?
airSlate SignNow complies with the applicable Australian legislation governing digital signatures, such as the Electronic Transactions Act. This compliance guarantees that your signed documents meet all necessary legal standards, affirming their validity and acceptance in legal settings.
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Are there any costs associated with using airSlate SignNow for digital signatures in Australia?
Yes, airSlate SignNow offers various pricing plans tailored to different business needs. With our cost-effective solution, you can achieve full compliance with the digital signature legitimateness for RD in Australia without breaking your budget.
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What features does airSlate SignNow offer to enhance digital signature processes?
airSlate SignNow provides features such as document templates, real-time tracking, and secure storage, all designed to streamline the eSignature experience. These features help ensure that your documents remain legally valid, supporting the digital signature legitimateness for RD in Australia.
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Can airSlate SignNow integrate with other software systems?
Indeed, airSlate SignNow offers seamless integrations with various applications such as CRM systems, cloud storage, and productivity tools. This flexibility allows your business to maintain efficient workflows while ensuring the digital signature legitimateness for RD in Australia.
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What benefits can businesses expect from using airSlate SignNow?
Businesses using airSlate SignNow can expect improved efficiency, reduced processing times, and enhanced security for their documents. By leveraging our platform, you can confidently utilize digital signatures knowing they uphold the digital signature legitimateness for RD in Australia.
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Is there customer support available for users of airSlate SignNow?
Yes, airSlate SignNow provides comprehensive customer support to assist users with any questions or issues they may encounter. Our support team is well-versed in matters concerning digital signature legitimateness for RD in Australia, ensuring you have the help you need.
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How to eSign a document: digital signature legitimateness for R&D in Australia
So let's look at what a digital signature actually looks like. For a digital signature we want Bob to prove that he has digitally signed a message to Alice, and for Alice to prove that that message has been signed only by him, and also that it hasn't been changed. So one of the most common formats that we get for our signatures is to generate the values of r and s. We'll try to outline how these values are generated and then the format of them and give a few examples of how we can create some code to be able to to read them okay so what we have with our digital signatures is that we have bob and we have alice uh here So, Bob will have his private key here and we'll also have his public key. So here is his public key. Alice can also have her own keys but in this case all we really want to do is to prove that Bob has signed a message with his private key so if we take the message here here we are and what we normally do is take a hash of the message and then we apply our private key on to produce a signature so in this case we will create our signature here and the signature we create is an r and an s value so we have the private key we have the message and then often we have a random value of k - also called the nonce value - which goes into produce (r,s) so then Bob sends the message over to Alice also sends the r and the s value and then she will use Bob's public key to do a check on the message or the signature should take a hash of the message she'll then take Bob's public key and then check the r and s values she doesn't need the k value (the nonce value) that was used to randomize the (r,s) values all she needs is the r and the s value, the public key from Bob and the message and if things check out then everything is fine. So later on we'll have a look at how we can actually support the (r,s) value as a signature so that Alice can can read it the two main methods that are used for this are ECDSA - elliptic curve digital signature algorithm - or we can use DSS this one uses RSA to be able to sign the message where we sign with an RSA private key and we will proven with the public key more common these days is to use elliptic curve methods rather than to use RSA leads to very big long keys typically 2Kbit and even up to 4Kbit where here we often just have 256-bit the keys the way the elliptic curve works is that we have our elliptic curve method and one of the most basic is in this form here (mod p). So we specify our elliptic curve with an a value, a b value, and a p value [y^2 = x^3 + ax +b (mod p)] we also define n the order and n is the total number of points on the curve so in a continuous form it looks like this graph here but obviously if we're using discrete points such as with the (mod p) we end up with scattered points but basically what we have is that on archive we have a G value and G is the base point it is the point that we can start our operations and then we work out our private key which is a random value if we're using a 256-bit curve such as secp256k1 then we have a 256-bit value we then multiply our base point with the scalar value which is pk 256 bits this operation is basically we add g lots of times we add a pk time so it's G plus G plus G so on until we get the point pk and it's quite an efficient operation an elliptic curve so our public key sorry this is our secret key that should be sk there our secret key is our private key and our public key pk is sk times g and this is a point so if this is 256 bits and a 256-bit curve this is 512 bits because it's an (x,y) point on the curve there are some curves that would we ignore the y value such as Curve 25519 and Curve 448 and we only deal with the x value but in most other curves are standard cards we use the x and the y point so our public key becomes an (x,y) point when we create our signature we create integer values as the same size as our base curve so typical curves that we have here as the one that's used in bitcoin except 256k1 we might also have one of the nist defined curves 256 or P192 the 192 identifies the number of bits that we're going to be using and that will define the size of the r and the s value that we have the public key as i said will be double that size because it has an x and y coordinate okay so that's the two main methods we'll look mainly at ECDSA in this presentation okay so here's the basic method that we're going to use bob generates a random value let's say it's 256 but the random value that is his private key he then generates the public key from this by taking the base point and multiplying it by his privilege key his private key to give his public key so that's pk and that's sk there he takes the message he hashes the message here then takes a random value k and produces a point r which is k times g we only typically need the x coordinate of the r value so although that's a coordinate point for the r value that we'll create we would just take the x coordinate from it and then bob calculates k to the minus one let's see that's mod n n is the order the inverse of k mod n which is our standard operation and then that's multiplied by the hash of the message plus r times the secret key gives us the value of s we then create that as a signature value as two integers r and s so how does Alice then check that okay so basically Bob will send over his private key we'll send the message over and then from these from the r and the s value we want Alice to be able to validate that so initially Alice takes a hash of the message then takes the s value and works at the inverse mod of n the inverse of s mod n to give the c value then take the hash value that we calculated here multiply by the c value mod n and then for the second value we will take the r value and the c value mod m we then work at a new point on the elliptic curve which is u1 times G and u2 times the public key of bob and then if that point is equal to the x-value then the signature is correct. So in this way we can actually validate that Bob signed it using the public key using the message and using the r and the s value so we can use lots of different curves if we want the NIST P-256, P-192. P-512. if we want even more security and secp256k1 is used with bitcoin so here's an example of some signatures that we have. Here's the private key remember that's a scalar value in this case we're using 256 bits so that's a 256 bit key here and so the public key is an x y point is the base point the base point is here multiplied by the private key to give us the public key. So this is Bob's private key and bob's public key it will then take the message and in this case the message is just "hello" it would then use the uh the method that we showed to be able to generate an r and less value here here's the values here as numbers but we can see we also define it in terms of signature you can identify this because it's starting with a 30 as we'll see later. So here are these are some examples so we just run a few more and we can select different types of curves so we'll select this one here and we can see here there's the base point on this curve there is the private key there's the public key and we eventually validate that this is true there's a signature and they are in the s value and we'll do a quick check there so the code if you're interested is is here and this allows us to be able to generate this uh signature but you can see there are many different ways that we could actually perform this including the brain pool methods and this one here okay so the way that we translate so we can have a problem in that when that we want to make sure that uh every machine can read this no matter what type of computer it is so we encapsulate the two integer values into what's called the der format and this is an encoding format which you can encapsulate virtually any type of of value within it in this in its base form it's a binary format and we have hexadecimal sequences for the the byte values so hexadecimal 30 identifies a sequence or something is coming later 0 3 identifies a better ray and 0 to identify as an integer in this case the r and the s value will be represented in as 02 or as integers. So here's a signature that we saw earlier and there so what we want to be able to do is to interpret that hexadecimal stream and to be able to work out the values of r and s and then so the first thing we come across is the 30 and then the next number is the number of bytes that will follow okay so there should be 35 bytes after this to to be able to identify the values coming next. The next value after the length is the identify the tag identifier for the type so in this case, it's 02 which is an integer and then we identify there are 19 bytes that follow there remember it's 19 hexadecimal so 19 hexadecimal comes out as a 25 in decimal which means there are 25 bytes after that then we get after the 25 bytes we get 02 and then 18 hexadecimal is 24. so the value here is the s value and the value here is the r value the r value and the s value we can see here there's zero zero so we can ignore them so both are off length 24 bytes 24 bytes if we multiply up by 8 gives us 192 bits and that fits our curve because this is curve 192 which is 192-bit curve if we take another example and this time we've got 256 bit curve using the bitcoin curve and here's the signature that we might have maybe someone's making a transaction for us signing it with the private key and then we'll be able to prove it with this rs signature and the public key so we'll parse again there are 46 x 46 bytes after this we then hit a zero two there it's there and then 21 hex defines the number of bytes that come after it and that is 21 is actually 33 bytes but we can see we've got one off there so we end up with 32 bytes of the r value then we get a 0 2 the 02 is here and then this is the s value that comes along here 21 bytes 21 hex bytes which is 32 bytes gives us the s value here so that's 32 bytes long or 256 bits that gives us our r and our s value here okay so here's an example here with a pm format and we can easily interpret that we can see the first thing we come across is the 30 followed by the zero two and then our value here is an integer then a value here is another uh integer if we want we can compartmentalize that into Base64 signatures we have here so let's have a look at the code which does that so we can take an example here so we'll try this one here there's a pm and there's the r value and the s value and in there so the code itself is an ASN.1 reader and it will go through until it finds the the right tags for that one so of course we're dealing with a zero two so we'll interpret the zero two to be able to give us our our values and these are some of the definitions that we have for for that uh format in them but we'll have a look at this code here and we'll just run an example here so there's the code and we'll see if we can define another curve just to test and this is the we'll go for this 160 value so we can basically just copy-and-paste that put it in there and then run it through and hopefully that will work for us. So there's the r value and there's the s value in this digital signature okay so that's been an outline of using the r and the s value and how we can create our signature and then in a DER format. Thank you
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