CN112272156A - E-mail receiving and sending system based on block chain - Google Patents
E-mail receiving and sending system based on block chainDownload PDFInfo
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- CN112272156A CN112272156ACN202010967543.6ACN202010967543ACN112272156ACN 112272156 ACN112272156 ACN 112272156ACN 202010967543 ACN202010967543 ACN 202010967543ACN 112272156 ACN112272156 ACN 112272156A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/42—Mailbox-related aspects, e.g. synchronisation of mailboxes
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/50—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using hash chains, e.g. blockchains or hash trees
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- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Information Transfer Between Computers (AREA)
Abstract
Description
Technical Field
The present invention relates to an e-mail receiving and sending technology, and more particularly, to an e-mail receiving and sending system based on a block chain.
Background
With the continuous and deep development of the mobile internet, mobile devices such as smart phones and tablet computers play an important role in daily life, and the traditional office mode is gradually changed into a more efficient mobile office mode. Mobile office is an indispensable part of the collaborative office industry, and is gradually becoming the mainstream office manner. The construction of a mobile office platform, namely the construction of a uniform and integratable mobile portal platform, which is popularized and applied from top to bottom, is bound to become a necessary choice for companies. The realization of the target must build strong support in the aspects of organization architecture, file management, message management, application management and the like. The unified file management is broadly speaking, including but not limited to the transmission and storage of electronic files such as announcements, documents, mails and the like in mobile office applications, and relates to various modules such as logs, examinations and approvals, announcements, documents, plans, mailboxes and the like. How to realize the long-term guarantee of authenticity, integrity, reliability and usability of the electronic document becomes important when a service support system and an enterprise intranet behind the mobile office system are completely exposed to the internet in the application process of the mobile office system. The mobile office brings convenience and also brings huge safety pressure.
Disclosure of Invention
The invention aims to provide an e-mail receiving and sending system based on a block chain, which is used for solving the problems of authenticity, integrity, reliability and usability in e-mail transmission.
According to an aspect of the present invention, there is provided a block chain-based mail transmission system including:
the mail client is used for sending the electronic mail comprising the sender, the receiver and the mail content to the mail server;
the mail server is used for analyzing the content of the received electronic mail to obtain four parts of a pure text of the mail, a hypertext of the mail, an embedded resource and a mail attachment; respectively encrypting the mail plain text, the mail hypertext, the embedded resource and the attachment through an encryption algorithm, and respectively uploading encrypted ciphertexts to an IPFS network;
the IPFS network is used for storing the received ciphertext and returning the generated ciphertext hash to the mail server;
and the block chain platform is used for receiving and storing the transaction information constructed by the mail server by using the ciphertext hash.
Preferably, the IPFS network is further configured to retrieve, after receiving the uploaded ciphertext, whether the same ciphertext has been stored; if the same ciphertext is stored, the received ciphertext is not stored any more, and corresponding ciphertext hash is returned; and if the same ciphertext is not stored, the IPFS network stores the received ciphertext and returns corresponding ciphertext hash.
Preferably, the IPFS network segments the ciphertext into several small shares, which are then stored scattered into the various nodes described by the hash table entries.
Preferably, the IPFS network breaks the ciphertext b into several small files b1, b2, b3, … … bn, and calculates hash values of the small files b1, b2, b3, … … bn, so as to construct a directed acyclic graph corresponding to the files; the hash value of the root node of the directed acyclic graph is the hash value of the ciphertext b, and the hash values of the leaf nodes of the directed acyclic graph correspond to the hash values of the respective small files b1, b2, b3 and … … bn.
Preferably, the ciphertext hash generated by the IPFS network includes: the mail plaintext ciphertext hash, the mail hypertext ciphertext hash, the embedded resource ciphertext hash and the attachment ciphertext hash.
Preferably, the transaction information constructed by the mail server by using the ciphertext hash comprises: a sender signature; a sender public key; a ciphertext hash generated by the IPFS network; and the wallet account of the recipient in the blockchain.
According to another aspect of the present invention, there is provided a block chain based mail receiving system, including:
the mail client is used for sending a receiving instruction for receiving the electronic mail to the mail server;
a blockchain platform for saving transaction data including a ciphertext hash relating to an email notification message;
the IPFS network is used for storing the mail ciphertext and the ciphertext hash of the mail ciphertext;
the mail server is used for retrieving whether new transaction data of the wallet account of the receiver exists in the blockchain platform; if new transaction data are retrieved, the mail server analyzes the transaction data, and accordingly ciphertext hash is obtained from the block chain platform; obtaining a corresponding ciphertext from the IPFS network by using a ciphertext hash obtained from the block chain; and decrypting the ciphertext and returning the decrypted ciphertext to the mail client.
Preferably, the IPFS network retrieves the corresponding ciphertext according to the ciphertext hash from the mail server to obtain a plain text ciphertext, a hypertext ciphertext, an embedded resource ciphertext and an attachment ciphertext; and sending the searched plain text ciphertext, the hypertext ciphertext, the embedded resource ciphertext and the attachment ciphertext to the mail server.
Preferably, the mail server decrypts the plaintext cipher text, the hypertext cipher text, the embedded resource cipher text and the attachment cipher text retrieved by the IPFS to obtain the plaintext, the hypertext, the embedded resource and the attachment.
Preferably, the mail server assembles the resulting plain text, hypertext, embedded resources and attachments into an email and returns the assembled email to the mail client.
Compared with the prior art, the invention has the beneficial technical effects that: the mail text and the mail attachment are stored in the IPFS in an encrypted manner, the physical storage cost is greatly reduced due to the file duplication removing characteristic, and the confidentiality of mail data is guaranteed; the transaction data is stored in the blockchain network as the mail notification message, so that the validity of the identity authentication is ensured; the block chain and the IPFS are combined, and the advantages of efficient storage and credible storage are combined.
Drawings
FIG. 1 is an architecture diagram of an email messaging system of the present invention;
FIG. 2 is an email sending flow diagram of the present invention;
FIG. 3 is an email reception flow diagram of the present invention;
fig. 4 is a flow chart of the creation of a wallet account (i.e., wallet address) of the present invention.
Detailed Description
Fig. 1 shows a block chain based mail transmission and reception system of the present invention. The system adopts a software system architecture with separated front and back ends, and mainly comprises a mail client, a mail server, an IPFS (distributed version file system) and a block chain platform (namely a block chain network).
The mail client refers to a Web application or a third-party client (such as foxmail, Outlook, and netbook mailbox master) and is responsible for viewing mails, editing mails, retrieving mails, and counting mails.
The mail server comprises a basic interface service module, a mail protocol service module, a block chaining oral service module and an IPFS interface service module. The basic interface service module is a main service of the mail server and is responsible for receiving, distributing and responding to requests from mail clients (particularly Web application terminals), and particularly assembling and analyzing mail contents according to an e-mail basic format (MIME format); the mail protocol service module is the core service of the mail server, supports various e-mail standard protocols such as SMTP, LMTP, POP3, IMAP and JMAP, and is responsible for receiving and sending mails; the block chain service module is an access service of a block chain platform, and performs API optimization and service encapsulation on the block chain platform by combining application characteristics; the IPFS interface service module is an access service of the IPFS, and API optimization and service encapsulation are carried out on the IPFS by combining application characteristics, particularly an encryption/decryption algorithm is introduced, so that the confidentiality of stored data of the IPFS is effectively guaranteed; the message queue service integrates message middleware, and mainly solves the problem of uplink storage of high-concurrency data in the process of sending the mails.
Fig. 2 shows a flow of sending an email by the email sending system based on the blockchain according to the present invention, which includes:
the mail client sends the electronic mail comprising the sender, the receiver and the mail content to a mail server;
the mail server analyzes the received e-mail content to obtain four parts of a mail plain text, a mail hypertext, an embedded resource and a mail attachment;
the mail server encrypts a mail plain text, a mail hypertext, an embedded resource and an attachment respectively through an encryption algorithm, and uploads encrypted ciphertexts to an IPFS network respectively;
the IPFS network stores the received ciphertext and returns the generated ciphertext hash to the mail server;
the mail server constructs transaction information using the ciphertext hash and sends the transaction information into a blockchain to store the ciphertext hash into a new chunk.
After receiving the uploaded ciphertext, the IPFS network of the electronic mail sending system searches whether the same ciphertext is stored; if the same ciphertext is stored, the received ciphertext is not stored any more, and corresponding ciphertext hash is returned; and if the same ciphertext is not stored, the IPFS network stores the received ciphertext and returns corresponding ciphertext hash.
The IPFS network of the email transmission system of the present invention divides the ciphertext into several small portions, and then dispersedly stores the divided portions in each node described in the hash table entry. Specifically, the IPFS network breaks the ciphertext b into several small files b1, b2, b3, … … bn, and calculates hash values of the small files b1, b2, b3, … … bn, thereby constructing a directed acyclic graph corresponding to the files, where the hash value of the root node of the directed acyclic graph is the hash value of the b file, and the hash values of the leaf nodes of the directed acyclic graph correspond to the hash values of the small files b1, b2, b3, … … bn.
The ciphertext hash generated by the IPFS network comprises: the mail plaintext ciphertext hash, the mail hypertext ciphertext hash, the embedded resource ciphertext hash and the attachment ciphertext hash.
The transaction information constructed by the mail server by using the ciphertext hash comprises the following steps: a sender signature; a sender public key; a ciphertext hash generated by the IPFS network; a recipient wallet address and a sender wallet address.
More specifically, the mail sending flow of the electronic mail sending system of the present invention is shown in fig. 2, and the mail sending process is: (1) a user edits mail content at a mail client (a Web application end or a third-party client) and sends an electronic mail to a mail protocol service of a mail server; (2) the SMTP service in the mail protocol service of the mail server receives the e-mail and analyzes the e-mail according to the MIME standard format to respectively analyze the e-mail into four parts of a mail plain text, a mail hypertext, an embedded resource and a mail attachment; (3) the IPFS interface service of the mail server encrypts a plain text, a hypertext, an embedded resource and an attachment of the e-mail respectively through an AES encryption algorithm and uploads a ciphertext of the plain text, the hypertext, the embedded resource and the attachment to an IPFS network respectively; (4) after receiving the uploaded ciphertext, the IPFS network firstly searches whether the ciphertext is stored, and if so, the IPFS network does not store the ciphertext any more. If not, the ciphertext is divided into small parts by a special algorithm and then stored in each node in a scattered way (the fault-tolerant mechanism in IPFS ensures that data is copied in a sufficient amount and stored in different nodes). But whether the ciphertext is stored or not, the ciphertext hash is returned; (5) returning a ciphertext hash; (6) the mail protocol service of the mail server constructs transaction information (the transaction information includes but is not limited to mail content, sender and receiver mailbox addresses, sending time) according to the returned ciphertext hash. (7) The mail server initiates a transaction request to the blockchain platform according to the constructed transaction information; (8) the block chain returns a transaction result to the mail server; (9) the mail server returns the mail sending result to the mail client.
Fig. 3 shows a mail receiving flow of the block chain based e-mail receiving system of the present invention, which includes:
the mail client sends a receiving instruction for receiving the electronic mail to a mail server;
retrieving whether new transaction data with a wallet account of the receiver exists in the blockchain in the mail server;
if new transaction data are retrieved, the mail server analyzes the transaction data, and accordingly ciphertext hash is obtained from the block chain;
the mail server obtains a ciphertext hash from the block chain and obtains a corresponding ciphertext from the IPFS network;
and the mail server decrypts the ciphertext and returns the decrypted ciphertext to the mail client.
Obtaining the corresponding ciphertext from the IPFS network includes: the IPFS network retrieves a corresponding ciphertext according to the ciphertext hash from the mail server to obtain a plain text ciphertext, a hypertext ciphertext, an embedded resource ciphertext and an attachment ciphertext; and the IPFS network sends the retrieved plain text ciphertext, the hypertext ciphertext, the embedded resource ciphertext and the attachment ciphertext to the mail server.
And the mail server decrypts the plain text ciphertext, the hypertext ciphertext, the embedded resource ciphertext and the attachment ciphertext retrieved by the IPFS to obtain the plain text, the hypertext, the embedded resource and the attachment. And the mail server assembles the obtained plain text, the hypertext, the embedded resources and the attachments into the electronic mail and returns the assembled electronic mail to the mail client.
More specifically, the mail receiving flow of the receiving system of the electronic mail of the present invention is shown in fig. 3, and the receiving process of the mail is: (1) a user receives an electronic mail at a mail client (a Web application end or a third party client) manually or regularly and sends a receiving instruction to a mail protocol service (a mail server); (2) after receiving the instruction, the IMAP/POP3/JMAP service in the mail protocol service (mail server) retrieves whether the mailbox account has a new mail, namely, the block chain interface service (mail server) is called to retrieve whether the wallet account corresponding to the mailbox account has new transaction data; (3) the mail server requests the block chain platform to acquire transaction data; (4) the block chain platform retrieves whether the mailbox account has new transaction data and returns the transaction data to the mail server; (5) after the mail protocol service of the mail server receives the retrieval result (assuming that new transaction data exist, n is greater than 0), analyzing the set of transaction data, and respectively obtaining mail plaintext data from the IPFS interface service of the mail server according to the ciphertext hash; (6) the IPFS interface service of the mail server acquires ciphertext data from the IPFS network according to the ciphertext hash; (7) the IPFS network retrieves and returns corresponding ciphertext data to the IPFS interface service according to the ciphertext hash; (8) the mail server decrypts the ciphertext data received by the IPFS interface service to obtain plaintext data of the mail; (9) the mail protocol service of the mail server assembles the E-mail with the MIME format according to the obtained mail plaintext data (comprising plaintext, hypertext, plaintext of embedded resources and attachment); (10) the mail server returns the assembled complete e-mail to the mail client.
The invention solves the problem of safe data storage of the current mail system by utilizing the characteristics of distributed storage, point-to-point transmission, a consensus mechanism, an encryption algorithm and the like of a block chain technology; the data redundancy storage problem of the current mail system is solved by utilizing the characteristics of content addressing, versioning, distributed storage and transmission and the like of the IPFS. Each data block includes a Header (Header) and a Body (Body).
The block header mainly contains information such as the hash value (address) of the previous block, a timestamp, a random number, the hash value (address) of the current block, the root value of the Merkle tree, the height of the current block, and the like.
The block body contains mainly transaction counts and transaction details. The transaction details are the book in the blockchain system, and each transaction is permanently posted to the data block and can be viewed by anyone. All transactions will generate a unique Merkle root through the Hash process of the Merkle tree and will be posted to the block header. The Merkle tree in the block body will digitally sign each transaction, thus ensuring that each transaction is not forgeable and has no duplicate transactions. Each transaction record contains detailed information including a hash value (Merkle node value) referring to the transaction, an index number of the transaction record, a digital signature of the transaction record, an expenditure wallet address, an expenditure amount, a reception wallet address, a reception amount, a transaction timestamp, a transaction size, and the like. Each transaction record has a Merkle node value, which is a part of the whole Merkle tree, and it is determined that each address cannot be traded repeatedly and forged. The Hash process is as shown in fig. 4, a Hash value (also called Hash value) is output after the Hash process is performed on plaintext data with any length, the Hash value is stored in a block, an email ciphertext is stored in an IPFS, and the IPFS firstly checks whether the ciphertext is stored or not when the ciphertext is stored, so that repeated storage of data is prevented, and the problem of data redundant storage is solved.
In the mail receiving system, after the mail client transmits the instruction of checking whether the mail is newly added to the mail server, the mail server determines whether the mail is newly added by searching whether the wallet account corresponding to the mailbox account has new transaction data.
The creation of the sender and recipient wallet addresses (i.e., wallet accounts) is shown in fig. 4, with the specific steps of: (1) a "private key" is first generated using a random number generator. (2) The "private key" is processed by the SECP256K1 algorithm to generate the "public key". (3) The public key is subjected to SHA256 calculation and RIPEMD160 calculation once respectively to obtain public key hash. (4) Connecting the address version number of one byte to the head of the public key hash (for the pubkey address of the bitcoin network, the byte is '0'), then carrying out SHA256 operation twice on the address version number, taking the first 4 bytes of the result as the check value of the public key hash, and connecting the check value to the tail of the public key hash; (5) the result of the previous step is encoded using BASE58, resulting in a "wallet address".
In order to prove that the mail is really signed and initiated by a sender and the integrity of the mail information is determined, the invention provides a method for using digital signature to avoid the occurrence of the events, the invention uses a private key to sign the mail, and the specific flow is as follows: (1) the original data of the transaction includes the "receiver wallet address" and the "hash ciphertext", but these alone are not enough, because the right of the initiator of the transaction to the "sender wallet address" cannot be proved, so the original data needs to be signed by the private key of the sender; (2) the 'sender signature' and 'sender public key' are added to the original transaction data, and formal transaction data are generated, so that the transaction data can be broadcasted to the blockchain network and sent as a mail.
In addition, the invention uses public key to verify the signature, transaction data is broadcast to the blockchain network, and the node verifies the validity of the transaction data, including the signature. If the verification is successful, the mail can be successfully transferred from the "sender wallet address" to the "receiver wallet address".
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (10)
1. An e-mail transmission system based on a block chain, comprising:
the mail client is used for sending the electronic mail comprising the sender, the receiver and the mail content to the mail server;
the mail server is used for analyzing the content of the received electronic mail to obtain four parts of a pure text of the mail, a hypertext of the mail, an embedded resource and a mail attachment; respectively encrypting the pure text, the hypertext, the embedded resource and the attachment of the mail by an encryption algorithm, and respectively uploading the encrypted ciphertext to the IPFS network;
the IPFS network is used for storing the received ciphertext and returning the generated ciphertext hash to the mail server;
and the block chain platform is used for receiving and storing the transaction data constructed by the mail server by utilizing the ciphertext hash.
2. The email sending system of claim 1, wherein the IPFS network is further configured to, upon receiving the uploaded ciphertext, retrieve whether the same ciphertext has been stored; if the same ciphertext is stored, the received ciphertext is not stored any more, and corresponding ciphertext hash is returned; and if the same ciphertext is not stored, the IPFS network stores the received ciphertext and returns corresponding ciphertext hash.
3. The electronic mail transmission system according to claim 2, wherein the IPFS network divides the ciphertext into the small pieces and then dispersedly stores the small pieces in the respective nodes described in the hash table entry.
4. The email sending system of claim 3, wherein the IPFS network breaks the ciphertext into a plurality of small files, and calculates hash values of the small files, thereby constructing a directed acyclic graph corresponding to the files; the hash value of the root node of the directed acyclic graph is the hash value of the ciphertext, and the hash values of the leaf nodes of the directed acyclic graph correspond to the hash values of the small files.
5. The mail sending system of claim 2, wherein the ciphertext hash generated by the IPFS network comprises: the mail plaintext ciphertext hash, the mail hypertext ciphertext hash, the embedded resource ciphertext hash and the attachment ciphertext hash.
6. The electronic mail transmission system according to claim 4, wherein the transaction information structured by the mail server using the ciphertext hash includes: a sender signature; a sender public key; a ciphertext hash generated by the IPFS network; and the wallet account of the recipient in the blockchain.
7. An e-mail receiving system based on a block chain, comprising:
the mail client is used for sending a receiving instruction for receiving the electronic mail to the mail server;
a blockchain platform for saving transaction data including a ciphertext hash relating to an email notification message;
the IPFS network is used for storing the mail ciphertext and the ciphertext hash of the mail ciphertext;
the mail server is used for retrieving whether new transaction data of the wallet account of the receiver exists in the blockchain platform; if new transaction data are retrieved, the mail server analyzes the transaction data, and accordingly ciphertext hash is obtained from the block chain platform; obtaining a corresponding ciphertext from the IPFS network by using a ciphertext hash obtained from the block chain; and decrypting the ciphertext and returning the decrypted ciphertext to the mail client.
8. The email receiving system of claim 7, wherein the IPFS network is further configured to retrieve the corresponding ciphertext according to the ciphertext hash from the mail server, resulting in a plaintext ciphertext, a hypertext ciphertext, an embedded resource ciphertext, and an attachment ciphertext; and sending the searched plain text ciphertext, the hypertext ciphertext, the embedded resource ciphertext and the attachment ciphertext to the mail server.
9. The email receiving system of claim 8, wherein the email server is further configured to decrypt the plaintext ciphertext, the hypertext ciphertext, the inline resource ciphertext, and the attachment ciphertext retrieved by the IPFS to obtain the plaintext, the hypertext, the inline resource, and the attachment.
10. The email receiving system of claim 9, wherein the mail server is further configured to assemble the obtained plain text, hypertext, embedded resources and attachments into an email and return the assembled email to the mail client.
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