TDEF (.tdef)
.tdef file signature | application/octet-stream
Telegram Desktop Encrypted File
Magic Bytes
Offset 0
54 44 45 46
Sources: Wikipedia
Extension
.tdef
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .tdef files in Python
def is_tdef(file_path: str) -> bool:
"""Check if file is a valid TDEF by magic bytes."""
signature = bytes([0x54, 0x44, 0x45, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .tdef files in Node.js
function isTDEF(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x44, 0x45, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .tdef files in Go
func IsTDEF(data []byte) bool {
signature := []byte{0x54, 0x44, 0x45, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/tdef
curl https://filesignature.org/api/v1/tdef
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .tdef file?
A .tdef file is a TDEF file. Telegram Desktop Encrypted File
What are the magic bytes for .tdef files?
The magic bytes for TDEF files are 54 44 45 46 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .tdef file?
To validate a .tdef file, read the first bytes of the file and compare them against the known magic bytes (54 44 45 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .tdef files?
There is no officially registered MIME type for .tdef files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .tdef files?
TDEF (.tdef) 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.