ASICS (.asics)
.asics file signature | application/vnd.etsi.asic-s+zip
ASICS, or Associated Signature Container, is a ZIP-based container format defined and maintained by the European Telecommunications Standards Institute (ETSI) for bundling digital signatures with related files. It is used for electronic signatures, document exchange, and archiving in e-government, legal, and business workflows. The format is generally safe, though it may contain signed content or embedded files; as with any archive, files should be verified and opened from trusted sources.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Apache Tika
Extension
.asics
MIME Type
application/vnd.etsi.asic-s+zip
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .asics files in Python
def is_asics(file_path: str) -> bool:
"""Check if file is a valid ASICS by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .asics files in Node.js
function isASICS(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .asics files in Go
func IsASICS(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/asics
curl https://filesignature.org/api/v1/asics
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .asics file?
A .asics file is identified by the magic bytes 50 4B 03 04 at byte offset 0. ASICS, or Associated Signature Container, is a ZIP-based container format defined and maintained by the European Telecommunications Standards Institute (ETSI) for bundling digital signatures with related files. It is used for electronic signatures, document exchange, and archiving in e-government, legal, and business workflows. The format is generally safe, though it may contain signed content or embedded files; as with any archive, files should be verified and opened from trusted sources.
What are the magic bytes for .asics files?
The magic bytes for ASICS files are 50 4B 03 04 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .asics file?
To validate a .asics file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .asics files?
The primary MIME type for .asics files is application/vnd.etsi.asic-s+zip.
Is it safe to open .asics files?
ASICS (.asics) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.