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EnCase case file (.cbk)

.cbk file signature | application/octet-stream

EnCase case file (and backup)

Safe

Magic Bytes

Offset 0
5F 43 41 53 45 5F

Sources: Gary Kessler

Extension

.cbk

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .cbk files in Python

Python 
def is_cbk(file_path: str) -> bool:
    """Check if file is a valid CBK by magic bytes."""
    signature = bytes([0x5F, 0x43, 0x41, 0x53, 0x45, 0x5F])
    with open(file_path, "rb") as f:
        return f.read(6) == signature

How to validate .cbk files in Node.js

Node.js 
function isCBK(buffer: Buffer): boolean {
  const signature = Buffer.from([0x5F, 0x43, 0x41, 0x53, 0x45, 0x5F]);
  return buffer.subarray(0, 6).equals(signature);
}

How to validate .cbk files in Go

Go 
func IsCBK(data []byte) bool {
    signature := []byte{0x5F, 0x43, 0x41, 0x53, 0x45, 0x5F}
    if len(data) < 6 {
        return false
    }
    return bytes.Equal(data[:6], signature)
}

API Endpoint

GET /api/v1/cbk
curl https://filesignature.org/api/v1/cbk

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .cbk file?

A .cbk file is a EnCase case file file. EnCase case file (and backup)

What are the magic bytes for .cbk files?

The magic bytes for EnCase case file files are 5F 43 41 53 45 5F at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .cbk file?

To validate a .cbk file, read the first bytes of the file and compare them against the known magic bytes (5F 43 41 53 45 5F) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .cbk files?

There is no officially registered MIME type for .cbk files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .cbk files?

EnCase case file (.cbk) 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.