Cryptographic signature, program, use of a cryptographic signature and platform

Abstract

A cryptographic signature, which is set up so that a procedure for creating tamper-proof documentation using the cryptographic signature function is feasible, comprising: - generating a SHA2 / SHA3 hash value from text content, - the integration of the hash value into the document structure for later verification of its integrity.

Description

[0001] The invention relates to a cryptographic signature, a program, the use of a cryptographic signature and a platform.

[0002] The purpose of the invention is to improve the state of the art.

[0003] The problem is solved by a cryptographic signature according to claim 1.

[0004] By means of the cryptographic signature according to the invention, also called BlackProof, BlackProof Core or BlackProof Core 1.0, a tamper-proof, encryptable signature and / or proof platform can advantageously be realized.

[0005] BlackProof can be used to implement a hybrid method for cryptographically secured documentation, verification, and optional encryption of text content. It combines digital signature mechanisms with symmetric encryption within a universally usable text format (e.g., RTF, TXT, PDF, HTML, JSON).

[0006] The process ensures that: - content has demonstrably not been manipulated (integrity) - selected content remains confidential (confidentiality) - each creator is identifiable through a unique signature (authenticity) Technical components:

[0007] Digital signature function (SHA hash): - The entire document text is provided with a cryptographic hash (SHA512). - Optionally, SHA256 or SHA3-512 can also be selected (future-proof, regulatory compliant). - The hash forms the digital fingerprint and can be used for verification.

[0008] Optional partial encryption (AES256) - Individual text passages or sections can be encrypted using AES256. - Encryption is performed symmetrically using a user-defined password or key. - The encrypted content is displayed as Base64 encoded text.

[0009] Document structure: - Free text area - Section: blackproof:x: [BASE64-encrypted part] - Section: SHA-512: [Final Document Hash] is a security-oriented software framework for creating, verifying, and archiving tamper-proof digital content based on modern cryptographic methods.

[0010] Use cases: - Area of ​​application - Legal documents: notes, contracts, evidence with time and signature protection

[0011] Key functions: - SHA256, SHA512, SHA3 Hashing (text, files, encrypted content) - AES256-GCM encryption for text fragments or complete documents (Base64-encoded) - Digital signature function with optional user certificate, pseudonym or eID - "BlackProof" marking for machine detection of embedded content - Signature time anchoring (local or server-based timestamps) - Multiple hash chaining for linear proof-of-concept (hash over hash) - HMAC / Hash-based authentication codes (e.g. HMAC-SHA256 / HMAC-SHA512)

[0012] Extended protection features (optional): - TPM / hardware binding: Using BIOS / TPM values ​​as verification keys - Role-based access: Documents can contain user roles (admin / user / readonly) - Device binding: Creation of signatures based on hardware characteristics - Time-controlled release: Documents are only readable after a defined time.

[0013] Format integration & compatibility: - BlackProof Core 1.0 allows signing and encryption directly in: RTF, TXT (annotated blocks) ◯ PDF: Integration behind %%EOF or as encrypted attachments ◯ HTML, SVG: via BlackProof compatible meta comments ◯ ZIP, DOCX: Embedding encrypted .bp data ◯ PNG, JPG: Metadata embedding via comment or block ender

[0014] Technical Architecture & SDK: - Availability as a C DLL, .NET, Python module (optional: Java / Kotlin wrapper) - BASE64 DLL: for encoding encrypted content - vfs_Engine: Access & processing in the virtual file system - Email DLL: for sending via Gmail / SMTP with embedded BlackProof signature

[0015] Validation & Tools: - CLI validator with hash checking, header detection, signature verification - GUI validator with timestamp, origin verification and export option - Email & SMS Hash Extractor (Beta) - Viewer module: Live display & analysis of encrypted text areas

[0016] Application examples: - Contracts & Communication: Verifiable, encrypted, digitally signed - License protection: Embedding in source code, graphics or ZIP files - Legally compliant documentation: With hardware binding, timestamp and user signature - Combination with eID / IDZIP: Linking with digital identity containers

[0017] Note: BlackProof Core 1.0 is intended for purely civilian, non-military use. Export or use in regulated environments requires separate authorization from the copyright holder.

[0018] The invention further comprises a novel form of digital redaction / redaction in which selected text areas are encrypted using an AEAD method (in particular AES-256-GCM) and converted into a displayable encoding (in particular Base64), thereby generating a visible but unreadable representation with an integrated check tag function.

[0019] The invention will be further described using the examples in the Fig. 1, Fig. 2 to Fig. 3 disclosed embodiments explained.

Claims

[1] Cryptographic signature which is set up so that a procedure for creating tamper-proof documentation using the cryptographic signature function is feasible, comprising: - generating a SHA2 / SHA3 hash value from text content, - the integration of the hash value into the document structure for later verification of its integrity. [2] Cryptographic signature according to claim 1, wherein the hash value is calculated using SHA-512. [3] Cryptographic signature according to one of the preceding claims, wherein additionally selected text passages or sections are symmetrically encrypted using AES256. [4] Cryptographic signature according to claim 3, wherein encrypted content is encoded and displayed within the document in Base64 format. [5] Cryptographic signature according to any of the preceding claims, wherein the document structure comprises the following sections: - a free text area, - a coded encrypted area (blackproof::[BASE64-coded]), - a final SHA-512 hash (signature block). [6] Cryptographic signature according to any of the preceding claims, wherein the SHA hash is attached to the document as a digital signature for authentication purposes. [7] Cryptographic signature according to any of the preceding claims, which is used in: - legal evidence preservation, - Contract creation with signature protection, - forensic evidence documentation. [8] Program or module with a graphical user interface (GUI) or command-line interface (CLI), wherein software for using a cryptographic signature according to any of the preceding claims is implemented and is in particular executable independently. [9] Use of a cryptographic signature according to any one of claims 1 to 7 or of a program according to the preceding claim in governmental, security-related or industrial applications. [10] Platform or external system in which a cryptographic signature according to one of claims 1 to 7 or a program for using the cryptographic signature according to one of claims 1 to 7 is integrated, in particular as additional protection for the individual security of internal content or user communication.

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