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Can I say “I will encrypt something” if I hash something?

Are there hash algorithms with variable length output?Will hashing over and over eventually give the same hash?Can hashing become encrypting?Self verifying hash algorithmCan an encryption method be used as a hash function?Encryption in popular compression file formats - 7zip, RAR, ZipAn example of an appropriate use case for AES-CBC encryption without authentication?Is it possible to guarantee a SHA-256 hash will begin with a certain 3 bytes?Using Diffie-Hellman secret key to encrypt/decrypt data?

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4

1

$begingroup$

As I understand it, a hashing algorithm is some kind of encryption, just a specific kind of it. So is it wrong to say "I encrypt this value." if I "only" hash it?

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

encryption hash terminology

share|improve this question

edited 37 mins ago

Peter Mortensen

12522 bronze badges

asked 12 hours ago

Johannes RabauerJohannes Rabauer

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New contributor

Johannes Rabauer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

4

1

$begingroup$

As I understand it, a hashing algorithm is some kind of encryption, just a specific kind of it. So is it wrong to say "I encrypt this value." if I "only" hash it?

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

encryption hash terminology

share|improve this question

edited 37 mins ago

Peter Mortensen

12522 bronze badges

asked 12 hours ago

Johannes RabauerJohannes Rabauer

2111 bronze badge

New contributor

Johannes Rabauer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

As I understand it, a hashing algorithm is some kind of encryption, just a specific kind of it. So is it wrong to say "I encrypt this value." if I "only" hash it?

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

encryption hash terminology

share|improve this question

edited 37 mins ago

Peter Mortensen

12522 bronze badges

asked 12 hours ago

Johannes RabauerJohannes Rabauer

2111 bronze badge

New contributor

Johannes Rabauer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

edited 37 mins ago

Peter Mortensen

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asked 12 hours ago

Johannes RabauerJohannes Rabauer

2111 bronze badge

New contributor

Johannes Rabauer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question

edited 37 mins ago

Peter Mortensen

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asked 12 hours ago

Johannes RabauerJohannes Rabauer

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edited 37 mins ago

Peter Mortensen

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edited 37 mins ago

Peter Mortensen

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asked 12 hours ago

Johannes RabauerJohannes Rabauer

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asked 12 hours ago

Johannes RabauerJohannes Rabauer

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4 Answers
4

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votes

14

$begingroup$

Encryption algorithms and hash algorithms both belong to the realm of cryptography but are two different things and encryption doesn't contain hash functions.

As stated on Wikipedia:

In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.

An encryption algorithm turns some data into a ciphertext which can later be decrypted again to it's original content by using the encryption key.

If you generate a hash of some data it's can't be "reversed" back into it's original content, because a hash function is (theoretically) a one-way function with loss of data.

share

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

$endgroup$

add a comment | 

5

$begingroup$

Encryption implies that with the appropriate key, it is possible to decrypt and recover the original message. Which (in general) is not possible from a hash.

Thus “I will encrypt” is not adequate if one is going to hash.

Also: a hashing algorithm is some kind of symmetric cryptography, not encryption. While it is possible to construct hashes from encryption primitives (such as block ciphers), and vice versa, they are different beasts.

share|improve this answer

edited 9 hours ago

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

$endgroup$

add a comment | 

3

$begingroup$

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

It is actually. A hash algorithm computes a 'fingerprint' if you will of the input. So just as a fingerprint identifies you, a hash identifies the input document.

But just as an entire human being cannot be recreated from just a fingerprint, so the original document cannot be (easily) recreated from the hash. This is the fundamental distinction with an encryption. In encryption it's useful to decrypt, using the original encryption key. You can't with a hash, and it has no key.

share|improve this answer

edited 2 hours ago

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  "It is actually" ... could you make it clear what part of the question is answered by including it in that first sentence or section?
  $endgroup$
  – Maarten Bodewes♦
  3 hours ago
  

  
  
  
  

add a comment | 

1

$begingroup$

Typically we require encryption be reversible, so it can be used as a communication system.

Mathematically, when we talk about a cryptographic system, we are focusing on invertible functions. This change in viewpoint is important, because it opens up the possibilities for how we can encrypt information.

For example, we can use a linear function (affine transformation) as an encryption system:

https://youtu.be/1S92scw5zIg?list=PLKXdxQAT3tCssgaWOy5vKXAR4WTPpRVYK

share|improve this answer

edited 7 hours ago

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Welcome to crypto.stackexchange - Can you please summarize the content of the link, or mention what the content is/why it's relevant? If the link ever dies or changes, it greatly diminishes the utility of the answer.
  $endgroup$
  – Ella Rose♦
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  CTR mode doesn't require the decryption.
  $endgroup$
  – kelalaka
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @kelalaka Yes, CTR mode as a cipher (which includes the XOR operation) certainly does require decryption. It's just that the underlying block cipher is only used in one direction (encryption or decryption as they are equivalent operations for block ciphers). You cannot equate block ciphers with a complete IND-CPA secure cipher. Actually, you can combine a hash function or HMAC with CTR mode to create a cipher, but that doesn't make a hash function a cipher.
  $endgroup$
  – Maarten Bodewes♦
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @MaartenBodewes wrong words used, any way you corrected it.
  $endgroup$
  – kelalaka
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  There's not a single word "hash" in this answer.
  $endgroup$
  – Oleg V. Volkov
  9 mins ago
  

  
  
  
  

add a comment | 

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14

$begingroup$

Encryption algorithms and hash algorithms both belong to the realm of cryptography but are two different things and encryption doesn't contain hash functions.

As stated on Wikipedia:

In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.

An encryption algorithm turns some data into a ciphertext which can later be decrypted again to it's original content by using the encryption key.

If you generate a hash of some data it's can't be "reversed" back into it's original content, because a hash function is (theoretically) a one-way function with loss of data.

share

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

$endgroup$

add a comment | 

14

$begingroup$

Encryption algorithms and hash algorithms both belong to the realm of cryptography but are two different things and encryption doesn't contain hash functions.

As stated on Wikipedia:

In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.

An encryption algorithm turns some data into a ciphertext which can later be decrypted again to it's original content by using the encryption key.

If you generate a hash of some data it's can't be "reversed" back into it's original content, because a hash function is (theoretically) a one-way function with loss of data.

share

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

$endgroup$

add a comment | 

$begingroup$

Encryption algorithms and hash algorithms both belong to the realm of cryptography but are two different things and encryption doesn't contain hash functions.

As stated on Wikipedia:

In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.

An encryption algorithm turns some data into a ciphertext which can later be decrypted again to it's original content by using the encryption key.

If you generate a hash of some data it's can't be "reversed" back into it's original content, because a hash function is (theoretically) a one-way function with loss of data.

share

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

$endgroup$

share

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

answered 12 hours ago

AleksanderRasAleksanderRas

4,26122 gold badges1111 silver badges4242 bronze badges

5

$begingroup$

Encryption implies that with the appropriate key, it is possible to decrypt and recover the original message. Which (in general) is not possible from a hash.

Thus “I will encrypt” is not adequate if one is going to hash.

Also: a hashing algorithm is some kind of symmetric cryptography, not encryption. While it is possible to construct hashes from encryption primitives (such as block ciphers), and vice versa, they are different beasts.

share|improve this answer

edited 9 hours ago

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

$endgroup$

add a comment | 

5

$begingroup$

Encryption implies that with the appropriate key, it is possible to decrypt and recover the original message. Which (in general) is not possible from a hash.

Thus “I will encrypt” is not adequate if one is going to hash.

Also: a hashing algorithm is some kind of symmetric cryptography, not encryption. While it is possible to construct hashes from encryption primitives (such as block ciphers), and vice versa, they are different beasts.

share|improve this answer

edited 9 hours ago

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

$endgroup$

add a comment | 

$begingroup$

Encryption implies that with the appropriate key, it is possible to decrypt and recover the original message. Which (in general) is not possible from a hash.

Thus “I will encrypt” is not adequate if one is going to hash.

Also: a hashing algorithm is some kind of symmetric cryptography, not encryption. While it is possible to construct hashes from encryption primitives (such as block ciphers), and vice versa, they are different beasts.

share|improve this answer

edited 9 hours ago

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

$endgroup$

share|improve this answer

edited 9 hours ago

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

answered 12 hours ago

fgrieufgrieu

85k77 gold badges189189 silver badges371371 bronze badges

3

$begingroup$

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

It is actually. A hash algorithm computes a 'fingerprint' if you will of the input. So just as a fingerprint identifies you, a hash identifies the input document.

But just as an entire human being cannot be recreated from just a fingerprint, so the original document cannot be (easily) recreated from the hash. This is the fundamental distinction with an encryption. In encryption it's useful to decrypt, using the original encryption key. You can't with a hash, and it has no key.

share|improve this answer

edited 2 hours ago

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  "It is actually" ... could you make it clear what part of the question is answered by including it in that first sentence or section?
  $endgroup$
  – Maarten Bodewes♦
  3 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

It is actually. A hash algorithm computes a 'fingerprint' if you will of the input. So just as a fingerprint identifies you, a hash identifies the input document.

But just as an entire human being cannot be recreated from just a fingerprint, so the original document cannot be (easily) recreated from the hash. This is the fundamental distinction with an encryption. In encryption it's useful to decrypt, using the original encryption key. You can't with a hash, and it has no key.

share|improve this answer

edited 2 hours ago

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  "It is actually" ... could you make it clear what part of the question is answered by including it in that first sentence or section?
  $endgroup$
  – Maarten Bodewes♦
  3 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

I understand that it gives the wrong impression, but I think it is not absolutely wrong, or is it?

It is actually. A hash algorithm computes a 'fingerprint' if you will of the input. So just as a fingerprint identifies you, a hash identifies the input document.

But just as an entire human being cannot be recreated from just a fingerprint, so the original document cannot be (easily) recreated from the hash. This is the fundamental distinction with an encryption. In encryption it's useful to decrypt, using the original encryption key. You can't with a hash, and it has no key.

share|improve this answer

edited 2 hours ago

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

$endgroup$

share|improve this answer

edited 2 hours ago

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

answered 12 hours ago

Paul UszakPaul Uszak

8,70111 gold badge1818 silver badges4141 bronze badges

1

$begingroup$

Typically we require encryption be reversible, so it can be used as a communication system.

Mathematically, when we talk about a cryptographic system, we are focusing on invertible functions. This change in viewpoint is important, because it opens up the possibilities for how we can encrypt information.

For example, we can use a linear function (affine transformation) as an encryption system:

https://youtu.be/1S92scw5zIg?list=PLKXdxQAT3tCssgaWOy5vKXAR4WTPpRVYK

share|improve this answer

edited 7 hours ago

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Welcome to crypto.stackexchange - Can you please summarize the content of the link, or mention what the content is/why it's relevant? If the link ever dies or changes, it greatly diminishes the utility of the answer.
  $endgroup$
  – Ella Rose♦
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  CTR mode doesn't require the decryption.
  $endgroup$
  – kelalaka
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @kelalaka Yes, CTR mode as a cipher (which includes the XOR operation) certainly does require decryption. It's just that the underlying block cipher is only used in one direction (encryption or decryption as they are equivalent operations for block ciphers). You cannot equate block ciphers with a complete IND-CPA secure cipher. Actually, you can combine a hash function or HMAC with CTR mode to create a cipher, but that doesn't make a hash function a cipher.
  $endgroup$
  – Maarten Bodewes♦
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @MaartenBodewes wrong words used, any way you corrected it.
  $endgroup$
  – kelalaka
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  There's not a single word "hash" in this answer.
  $endgroup$
  – Oleg V. Volkov
  9 mins ago
  

  
  
  
  

add a comment | 

1

$begingroup$

Typically we require encryption be reversible, so it can be used as a communication system.

Mathematically, when we talk about a cryptographic system, we are focusing on invertible functions. This change in viewpoint is important, because it opens up the possibilities for how we can encrypt information.

For example, we can use a linear function (affine transformation) as an encryption system:

https://youtu.be/1S92scw5zIg?list=PLKXdxQAT3tCssgaWOy5vKXAR4WTPpRVYK

share|improve this answer

edited 7 hours ago

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Welcome to crypto.stackexchange - Can you please summarize the content of the link, or mention what the content is/why it's relevant? If the link ever dies or changes, it greatly diminishes the utility of the answer.
  $endgroup$
  – Ella Rose♦
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  CTR mode doesn't require the decryption.
  $endgroup$
  – kelalaka
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @kelalaka Yes, CTR mode as a cipher (which includes the XOR operation) certainly does require decryption. It's just that the underlying block cipher is only used in one direction (encryption or decryption as they are equivalent operations for block ciphers). You cannot equate block ciphers with a complete IND-CPA secure cipher. Actually, you can combine a hash function or HMAC with CTR mode to create a cipher, but that doesn't make a hash function a cipher.
  $endgroup$
  – Maarten Bodewes♦
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @MaartenBodewes wrong words used, any way you corrected it.
  $endgroup$
  – kelalaka
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  There's not a single word "hash" in this answer.
  $endgroup$
  – Oleg V. Volkov
  9 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

Typically we require encryption be reversible, so it can be used as a communication system.

Mathematically, when we talk about a cryptographic system, we are focusing on invertible functions. This change in viewpoint is important, because it opens up the possibilities for how we can encrypt information.

For example, we can use a linear function (affine transformation) as an encryption system:

https://youtu.be/1S92scw5zIg?list=PLKXdxQAT3tCssgaWOy5vKXAR4WTPpRVYK

share|improve this answer

edited 7 hours ago

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this answer

edited 7 hours ago

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges

New contributor

Jeff Suzuki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 8 hours ago

Jeff SuzukiJeff Suzuki

1122 bronze badges